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MODELS
OPERATOR'S MANUAL
1BAAGABAP0290
1BAAGABAP0280
English (Australia)
Code No. RC468-8131-4
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PRINTED IN JAPAN
©
KUBOTA Corporation 2007
READ AND SAVE THIS MANUAL
KX91-3 · U35-3
KUBOTA Corporation is ···
Since its inception in 1890, KUBOTA Corporation has grown to
rank as one of the major firms in Japan.
To achieve this status, the company has through the years
diversified the range of its products and services to a remarkable
extent, until today, 19 plants and 16,000 employees produce over
1,000 different items, large and small.
All these products and all the services which accompany them,
however, are unified by one central commitment. KUBOTA makes
products which, taken on a national scale, are basic necessities.
Products which are indispensable, products intended to help
individuals and nations fulfill the potential inherent in their
environment. For KUBOTA is the Basic Necessities Giant.
This potential includes water supply, food from the soil and from
the sea, industrial development, architecture and construction, and
transportation.
Thousands of people depend on KUBOTA's know-how, technology,
experience and customer service. You too can depend on
KUBOTA.
KX91-3S2/U35-3S2
AO . I . 5 - 5 . 1 . AK
Abbreviations Description
LIST OF ABBREVIATION
American Petroleum Institute
American Society for Testing and Materials, USA
Committee for European Construction Equipment
German Institute for Standards, Federal Republic of Germany
European Standard
Falling Object Protective Structures
''Front'' means the front view towards the boom and dozer
High speed
International Standardization Organization
Japanese Industrial Standard
Volume (Liter)
Liter per minute
Low speed
Military Standards
Revolutions Per Minute
Roll-Over Protective Structures
Society of Automotive Engineers, USA
Two Pattern Selection System
Auto Idle
API
ASTM
CECE
DIN
EN
FOPS
FRONT
Hi
ISO
JIS
L
L/min
Lo
MIL
rpm
ROPS
SAE
TPSS
AI
GENERAL SYMBOLS
The instruments and operation elements have been marked with a series of symbols in order to simplify the operation of
excavator. These symbols are listed below with the respective descriptions.
Safety alert Symbol
Warning lamp ''Fuel level too low''
System lamp
Warning lamp ''Engine Oil pressure''
Warning lamp ''Battery charge''
Warning lamp ''Auto Idle (AI) Lamp''
Indicator lamp ''Glow''
Working light switch
Horn
Wiper/Washer switch
Diesel
Hydraulic fluid
Gear oil
Grease
Fast
Slow
Excavator - Overhead movement toward the front
Excavator - Overhead movement toward the rear
Boom up
Boom down
Arm up
Arm crowd
Bucket crowd
Bucket dump
Boom swing (left)
Boom swing (Right)
Dozer raise
Dozer lower
Operation direction of control lever
Operation direction of control lever
Read operator's manual
Engine stop control lamp
FOREWORD
3
SAFETY FIRST
IMPORTANT :
NOTE :
3
DANGER :
3
WARNING :
3
CAUTION :
Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
Indicates that equipment or property damage could result if
instructions are not followed.
Gives helpful information.
You are now the proud owner of a KUBOTA Excavator. This excavator is a product
of KUBOTA quality engineering and manufacturing. It is made of fine materials and
under a rigid quality control system. It will give you long, satisfactory service. To
obtain the best use of your excavator, please read this manual carefully. It will help
you become familiar with the operation of the excavator and contains many helpful
hints about excavator maintenance. It is KUBOTA's policy to utilize as quickly as
possible every advance in our research. The immediate use of new techniques in
the manufacture of products may cause some small parts of this manual to be
outdated. KUBOTA distributors and dealers will have the most up-to-date
information. Please do not hesitate to consult with them.
Please note that there may be some differences between your actual machine and
the illustration in the instructions.
This symbol, the industry's ''Safety Alert Symbol'', is used throughout this manual
and on labels on the machine itself to warn of the possibility of personal injury.
Read these instructions carefully. It is essential that you read the instructions and
safety regulations before you attempt to assemble or use this unit.
CONTENTS
SAFE OPERATION ................................................................................................. 1
DEALER SERVICE...................................................................................................... 1
TECHNICAL DATA...................................................................................................... 2
DESCRIPTION OF MACHINE PARTS........................................................................ 3
INSTRUMENT PANEL AND CONTROL ELEMENTS................................................. 4
CHECKS BEFORE START ......................................................................................... 6
DAILY CHECKS....................................................................................................... 6
CAB TYPE MACHINES ........................................................................................... 6
Wiper/Washer Switch(CAB type only) ..............................................................................6
Interior Lamp(CAB type only) ........................................................................................... 6
Heater Switch(CAB type).................................................................................................. 7
Opening/Closing of CAB Door(CAB type only).................................................................8
Opening/Closing of Front CAB Window(CAB type only) ..................................................8
Working Light Switch ........................................................................................................9
Emergency Hammer(CAB type only)................................................................................ 9
OPERATION OF THE ENGINE................................................................................. 10
STARTING THE ENGINE ...................................................................................... 10
Display Selector Switch .................................................................................................. 11
Charge Lamp..................................................................................................................12
Oil Lamp ......................................................................................................................... 12
Glow Lamp......................................................................................................................12
LCD Display for Normal Operation ................................................................................. 12
LCD Display for Warning ................................................................................................13
Warning Lamp ................................................................................................................14
Checkpoints after Starting the Engine ............................................................................14
STARTING THE ENGINE UNDER COLD CONDITIONS...................................... 15
STOPPING THE ENGINE...................................................................................... 15
Emergency Engine Stop Knob........................................................................................15
STARTING WITH AN AUXILIARY BATTERY ....................................................... 16
Observe Following Guidelines when Starting with an Auxiliary Battery.......................... 16
EXCAVATOR OPERATION ...................................................................................... 17
RUNNING-IN OF THE NEW EXCAVATOR........................................................... 17
Do not Work with Full Engine Rpm's or Full Loads during the First 50 Working Hours.. 17
Oil Change in the Run-in Stage......................................................................................17
Seat Belt ......................................................................................................................... 17
STARTING ............................................................................................................. 17
Operator's Seat............................................................................................................... 17
Lock Lever ......................................................................................................................18
Working Light Switch ......................................................................................................19
Travel Buzzer..................................................................................................................19
DRIVING ................................................................................................................ 19
Drive Levers(Right,Left)..................................................................................................20
Travel Speed Switch.......................................................................................................21
CONTENTS
TURNS................................................................................................................... 22
Pivot Turn ....................................................................................................................... 22
Spin Turn ........................................................................................................................ 23
UP AND DOWNHILL DRIVING.............................................................................. 23
OPERATION OF THE DOZER .............................................................................. 24
TWO PATTERN SELECTION SYSTEM(TPSS) .................................................... 24
Pattern Change...............................................................................................................24
OPERATION OF THE BOOM................................................................................ 25
OPERATION OF THE ARM................................................................................... 26
OPERATION OF THE BUCKET ............................................................................ 26
UNIT SWING AND BOOM SWING OPERATION.................................................. 27
Unit Swing Operation......................................................................................................27
Boom Swing Operation...................................................................................................27
SERVICE PORT OPERATION .............................................................................. 28
Service Port Operation ...................................................................................................28
One Way Flow Operation ...............................................................................................32
1-way or 2-way CIRCUIT SELECTION VALVE OPERATION ............................... 33
AUTO IDLE (AI) OPERATION ............................................................................... 34
IMPORTANT INFORMATION ON EXCAVATOR OPERATION ............................ 34
HOW TO RELEASE PRESSURE TRAPPED IN THE HYDRAULIC SYSTEM...... 35
TRANSPORTING THE EXCAVATOR ON A VEHICLE............................................. 36
LIFTING OF THE EXCAVATOR................................................................................ 38
MAINTENANCE......................................................................................................... 40
MAINTENANCE INTERVALS ................................................................................ 40
OPENING AND CLOSING OF PARTS.................................................................. 43
Opening and Closing of the Fuel Tank Cap....................................................................43
Opening/Closing of the Engine Hood .............................................................................43
Opening/Closing of the Side Hood .................................................................................43
Where to store the Tool and the Grease Gun.................................................................44
Where to keep Operators Manual...................................................................................44
DAILY CHECKS..................................................................................................... 45
Checking Coolant Level.................................................................................................. 45
Checking Fuel Level .......................................................................................................45
Checking Engine Oil Level..............................................................................................46
Checking Hydraulic Oil Level.......................................................................................... 46
Lubrication Points ........................................................................................................... 47
Checking Radiator and Oil Cooler .................................................................................. 48
Checking Washer Liquid(only for CAB type) .................................................................. 48
Checking and Cleaning Engine and Electrical Wiring..................................................... 48
Washing Whole Machine................................................................................................48
REGULAR CHECKS AND MAINTENANCE WORK ................................................. 49
EVERY 50 SERVICE HOURS ............................................................................... 49
Draining Fuel Tank .........................................................................................................49
Draining Water Separator...............................................................................................49
Battery ............................................................................................................................ 49
Battery Charging.............................................................................................................50
Greasing Swing Bearing Teeth.......................................................................................51
EVERY 200 SERVICE HOURS ............................................................................. 51
Checking Fan Belt Tension.............................................................................................51
CONTENTS
Checking Radiator Hoses and Clamps........................................................................... 51
Inspection and Cleaning Air Filter Element..................................................................... 52
Air Filter Maintenance..................................................................................................... 53
Greasing Swing Bearing................................................................................................. 53
Checking Fuel Line and Intake Air Line .......................................................................... 54
EVERY 250 SERVICE HOURS ............................................................................. 54
Changing Engine Oil(First Engine Oil Change after 50 Service Hours) ......................... 54
EVERY 500 SERVICE HOURS ............................................................................. 55
Replacing Engine Oil Filter(Replace the engine oil filter every 500 hours,
or every 1 year in the case that service hour is less than 500 hours)............................. 55
Drive unit Oil Change(First Oil Change at 100 hours) ....................................................55
Replacing Fuel Filter Cartridge.......................................................................................56
Replacing Hydraulic Return Filter Element(first replacement after 250 service hours) .. 56
EVERY 1000 SERVICE HOURS ........................................................................... 57
Hydraulic Oil Check for Machines with Hydraulic Breakers............................................57
Hydraulic Oil Change(Including Replacing Suction Filter
and Breather Filter Element in Hydraulic Tank)..............................................................57
Replacing Hydraulic Pilot Filter Element......................................................................... 58
EVERY 1000 SERVICE HOURS OR ONCE A YEAR ........................................... 58
Replacing Air Filter Element ........................................................................................... 58
EVERY 1500 SERVICE HOURS ........................................................................... 58
Checking Fuel Injection Nozzle(Injection Pressure) .......................................................58
EVERY 2000 SERVICE HOURS ........................................................................... 58
Changing Front Idler and Track Roller Oil ...................................................................... 58
Checking Alternator and Starter Motor ........................................................................... 58
EVERY 3000 SERVICE HOURS ........................................................................... 59
Checking Injection Pump................................................................................................59
ANNUAL SERVICE................................................................................................ 59
Electrical Wiring and Fuses ............................................................................................ 59
BIENNIAL SERVICING .......................................................................................... 59
Replacing of Radiator Hoses.......................................................................................... 59
Changing Radiator Coolant ............................................................................................ 59
Replacing Fuel Hose ......................................................................................................60
Replacing Intake Air line.................................................................................................60
OTHER ADJUSTMENTS AND REPLACEMENTS.................................................... 61
PURGING FUEL SYSTEM .................................................................................... 61
ADJUSTMENT OF TRACKS ................................................................................. 61
Rubber Tracks ................................................................................................................61
Special Information when Using Rubber Tracks.............................................................62
Steel Tracks....................................................................................................................62
CHANGING THE BUCKET .................................................................................... 63
FUSES ................................................................................................................... 63
Replacing Fuses.............................................................................................................63
Fuse Capacities and Circuits.......................................................................................... 63
Auxiliary Electric .............................................................................................................64
Slow Blow Fuse ..............................................................................................................64
TROUBLESHOOTING............................................................................................... 65
KUBOTA I.C.S. NAVIGATION LIST OF MESSAGES ........................................... 67
OPERATION UNDER COLD WEATHER CONDITIONS .......................................... 69
CONTENTS
PREPARATION FOR OPERATION IN COLD WEATHER .................................... 69
PROCEDURE AFTER DONE WORK.................................................................... 69
LONG STORAGE ...................................................................................................... 70
RECOMMENDED OILS............................................................................................. 72
APPENDICES............................................................................................................ 73
MAIN DIMENSIONS .............................................................................................. 73
LIFTING CAPACITY .................................................................................................. 74
1SAFE OPERATION
SAFE OPERATION
The best insurance against accidents is to abide by the
safety regulations.
Read and understand this manual carefully before
operating the excavator.
Every user, however experienced, should carefully read
and understand this manual and those of the attachments
and accessories before taking the excavator into
operation. The owner is obliged to inform the operators of
these instructions in detail.
Keep this manual in the pocket under the seat.
1. Make yourself acquainted with the excavator and be
aware of its limits. Read the operating instructions
carefully before starting the excavator.
2. Obey the danger, warning and caution labels on the
machine.
3. For your safety, ROPS/FOPS (Roll-Over Protective
Structures, Falling Objects Protective Structures.) with
a seat belt is installed by KUBOTA. Always use the
seat belt when the machine is equipped with a ROPS/
FOPS.
Do not modify structural members of ROPS by
welding, drilling, bending, grinding or cutting, as this
may weaken the structure. If any component is
damaged, replace it. Do not attempt repairs. If ROPS
is loosened or removed for any reason, make sure all
parts are reinstalled correctly. Tighten mounting bolts
to proper torque.
4. The seat belt must be inspected regularly and
replaced if damaged.
5. Study control lever pattern A and pattern B. Then
choose the one which is most familiar. Familiarize
yourself with the pattern selected by operation slowly
at low engine speed.
6. Do not operate the excavator while under the influence
of alcohol, medication, controlled substances or while
fatigued.
7. Check the surroundings carefully before using the
excavator or when attachments are being attached.
A Pay attention to the overhead clearance with electric
wires.
A Check for pipes and buried cables before digging.
A Check for hidden holes, hindrances, soft underground,
and overhangs.
1. BEFORE OPERATION
(1) Seat belt
(1) Pattern selector lever (Two Pattern Selection System: TPSS)
SAFE OPERATION2
A During excavator use, do not allow any persons within
the working range.
8. Do not allow other persons to use the machine before
having informed him on the exact operation and work
instructions, and be assured that the operator's
manual has been read and completely understood.
9. Do not wear baggy, torn or oversized clothing when
working with the excavator. Clothing can get caught in
rotating parts or control elements which can cause
accidents or injuries. Wear adequate safety clothing,
e.g. safety helmet, safety shoes, eye protection, ear
protection, working gloves, etc., as necessary and as
prescribed by law or statutes.
10.Do not allow passengers to ride on any part of the
excavator at anytime. The operator must remain in the
excavator seat during operation.
11.Check mechanical parts for correct adjustments and
wear. Replace worn or damaged parts immediately.
12.Keep your excavator clean. Heavy soiling, grease,
dust and grass can cause fires, accidents or injuries.
13.Use only KUBOTA authorized attachments.
14.Before starting the excavator, be absolutely sure that
the excavator has been filled with fuel, lubricated,
greased and undergone all necessary maintenance.
15.Do not modify the excavator, otherwise it could lead to
unforeseen safety problems.
16.Make sure attachments, particularly those utilizing
quick attach systems, are securely mounted.
1. Get into and out of the machine safely. Always face the
machine. Always use handrails and available steps
and keep yourself well balanced. Do not hold any of
the control levers and switches. Do not jump on or off
the machine, whether stationary or in motion.
2. Start and control the excavator only from the
operator's seat. The driver should not lean out of his
seat when the engine is running.
3. Before starting the engine, make sure that lock levers
are in position "Lock" and all control levers and pedals
are in their neutral positions and the seat belt is
fastened correctly.
4. Make sure that the dozer blade is in front of you. (The
dozer must be raised.) If the levers are activated with
the dozer blade at the rear, the tracks will move in the
opposite direction of the drive levers.
5. Do not operate or idle engine in a non-ventilated area.
Carbon monoxide gas is colorless, odorless, and
deadly.
(1) Helmet
(2) Clothing fit for work
(3) Tight seams
(4) Good grip footwear
(5) Well fitting cuffs
(6) Working gloves
(7) Straw hat
(8) Towel
(9) Baggy trousers
(10) Loose cuffs of the shirt
(11) Baggy shirt
(12) Rubber sandals
2. STARTING OF THE EXCAVATOR
3SAFE OPERATION
6. Keep all safety equipment and covers in place.
Replace damaged or missing safety devices.
7. Precautions against tipping over. Keep away from
steep slopes and embankments. Do not swing the
bucket downhill. Lower the dozer during digging. Keep
the bucket as low as possible while driving uphill. Turn
slowly on slopes (at reduced speed). Do not place the
excavator near the edges of trenches and banks, as
the earth can give away due to the weight of the
excavator.
8. Watch out at all times for the area to which the
excavator is being moved.
Pay attention to any hindrances.
C Safety for children
Tragedy can occur if the operator is not alert to the
presence of children. Children generally are attracted to
machines and the work they do.
1. Never assume that children will remain where you last
saw them.
2. Keep children out of the work area and under the
watchful eye of another responsible adult.
3. Be alert and shut your machine down if children enter
the work area.
4. Never carry children on your machine. There is no safe
place for them to ride. They may fall off and be run
over or interfere with your control of the machine.
5. Never allow children to operate the machine even
under adult supervision.
6. Never allow children to play on the machine or on the
attachments.
7. Use extra caution when backing up. Look behind and
down to make sure the area clear before moving.
8. When parking your machine, if at all possible, park on
a firm, flat and level surface; if not, park across a slope.
Lower the bucket and dozer to the ground, remove the
key, place the control lock levers in the locked position
from the ignition and lock the cab door (if equipped),
before you leave.
Before leaving the machine,
A Park the excavator on a firm, flat and level surface.
A Lower the attachments and the dozer blade to the
ground.
A Stop the engine.
A Release pressure trapped in the hydraulic system.
A Lock all control levers.
A Remove the key.
3. AFTER OPERATION
(1) Lock lever for control lever (A) "Unlock"
(B) "Lock"
SAFE OPERATION4
1. Observe all regulations concerning the transport of
excavators on public roads.
2. Use adequately long and robust ramps when loading
on a vehicle. (for details see "TRANSPORTING THE
EXCAVATOR ON A VEHICLE")
3. Do not change the running direction and to avoid a
tipping over, do not try to swing the attachment
crosswise to the loading ramps.
4. Lower the attachment on the loading plane and
release the pressure from the hydraulic system.
Block the tracks with blocks and tie down the
excavator. After loading the excavator on the vehicle,
securely tie down the undercarriage of the excavator
using suitable chains, tensioners and approved
methods.
5. Avoid abrupt braking of the vehicle with the excavator
loaded. The excavator may shift causing on accident.
6. If the excavator is to tow another machine, make sure
the load is smaller than the strength of the hook, tow
chain or cable.
7. Do not use hooks on the roof of canopy or cabin for
lifting the excavator.
Before doing maintenance work on the excavator, place
the machine on even solid ground, lower the attachments
to the ground, stop the engine , release pressure trapped
in the hydraulic system and remove the key. When
dismantling hydraulic parts, make sure that the hydraulic
oil has cooled down sufficiently to avoid burns.
Start maintenance work carefully, e.g. loosen plug slowly
so that oil will not squirt out.
1. Before doing work on the engine, the exhaust system,
the radiator and the hydraulics, let the excavator cool
down sufficiently.
2. Turn off the engine at all times when filling with fuel.
Avoid spilling and over-filling of fuel.
3. Smoking is prohibited while refueling or handling the
battery! Keep sparks and fire away from the fuel tank
and battery. Flammable gases escape from the
battery, especially during charging.
4. Do not use or charge the refillable type battery if the
fluid level is below the LOWER (lower limit level) mark.
Otherwise, the battery component parts may be
prematurely deteriorated, which may shorten the
battery's service life or cause an explosion. Check the
fluid level regularly and add distilled water as required
so that the fluid level is between the UPPER and
LOWER levels.
5. Read and follow the directions "STARTING WITH AN
AUXILIARY BATTERY" in "OPERATION OF THE
ENGINE", when starting with an auxiliary battery.
6. Keep a first-aid box and a fire extinguisher at hand at
all times.
7. Do not open the radiator cap before the radiator has
cooled down sufficiently
First loosen the cap to the first stop and allow the
system enough time to release the remaining
pressure. Then loosen the cap completely.
8. To avoid short-circuiting the battery, always remove
the ground cable first and attach the plus cable first.
9. Leaking hydraulic fluid has enough pressure to
penetrate the skin and cause serious injuries.
Leakages from pin holes can be totally invisible. Do
not use hands for checking for leaks. Always use a
piece of wood or cardboard. It is strongly
recommended to use a face mask or eye protection.
Should injuries occur with leaking hydraulic fluid,
contact a doctor immediately. This fluid can cause
gangrene or serious allergic reactions.
4. SAFE LOADING AND TRANSPORT OF
THE EXCAVATOR
Max. drawbar pull at
coupling hook
70450 N (7183 kgf)
Max. vertical load at
coupling hook
7210 N (735 kgf)
5. MAINTENANCE
5SAFE OPERATION
10.To avoid environmental damage from acid and heavy
metals, do not throw the battery away.
11.Observe all laws and regulations concerning the
disposal of used oil, coolants, solvents, hydraulic
fluids, battery acids and batteries.
12.To avoid fire, do not heat the hydraulic components
(tanks, pipes, hoses, cylinders) before they have been
drained and washed.
13.Use a face mask or eye protection to protect the eyes
and respiratory system against dust and other foreign
particles.
14.Securely support excavator with stands or suitable
blocking before working underneath. For your safety,
do not work under any hydraulically supported
devices. They can settle, suddenly leak down, or be
accidentally lowered.
15.Do not dismantle the spring of the track tensioner. If
dismantling is necessary, contact your KUBOTA
dealer where the machine was purchased, or
competent service shop. The assembly must be done
according to the work shop manual of KUBOTA
(W.S.M.) for the product involved.
16.KUBOTA uses no parts which are lined with asbestos.
Do not use these kind of parts even if they are
available and can be installed.
SAFE OPERATION6
6. DANGER, WARNING AND CAUTION LABELS
7SAFE OPERATION
SAFE OPERATION8
9SAFE OPERATION
SAFE OPERATION10
11SAFE OPERATION
SAFE OPERATION12
1DEALER SERVICE
DEALER SERVICE
Your KUBOTA dealer is always ready to help so that your
excavator offers the best performance. After having
carefully read these instruction, you will realize that much
of the routine maintenance can be done by yourself. Your
KUBOTA dealer is responsible for servicing and the
delivery of spare parts. When ordering spare parts from
your KUBOTA dealer, always mention the serial number
of the excavator and the engine.
Note these numbers right away in the supplied lines.
Model Serial No.
Excavator
Engine
Dealer's name
(To be filled in through the owner)
(1) Serial No.
(1) Engine serial No.
2 TECHNICAL DATA
TECHNICAL DATA
A Above dimensions are based on the machine with rubber trucks.
A Specifications subject to change without notice.
D With unloaded digging bucket.
D Firm compacted soil.
D Operators must exercise extra caution and follow instructions in the operator's manual.
D Worse condition or heavier attachment to the above will decrease climbing angle.
KUBOTA EXCAVATOR
Model name KX91-3S2 U35-3S2
Type Canopy CAB Canopy CAB
Operating weight (including operator's) kg 3225 3325 3640 3750
Engine
Type Water cooled 4 cycle diesel engine with 3 cylinder
Model name
KUBOTA
D1703-M-E3-BH-US2
KUBOTA
D1703-M-E3-BH-US1
Total displacement cc 1647
Engine power SAE
J1955 gross
kW 22.1
Rated speed rpm 2250
Performance
Unit swing speed rpm 9.4 8.9
Travel speed
Fast km/h 4.8 4.6
Slow km/h 3.1 3.0
Ground pressure
(With operator)
kPa
(kgf/ )
31.8
(0.32)
32.8
(0.33)
32.7
(0.33)
33.7
(0.34)
Climbing angle % (deg) *36 (20)
Angle in case of
crossing slope
% (deg) *27 (15)
Dozer Width x Height mm 1550 x 335 1700 x 335
Boom swing angle
Left rad (deg) 1.40 (80) 1.22 (70)
Right rad (deg) 0.87 (50)
Pressure
connection
for
attachments
Max.displacement
(Theoretical)
L/min 63.0 60.0
Max. pressure
Mpa
(kgf/ )
23.5
(240)
24.5
(250)
Fuel tank capacity L 50 40
3DESCRIPTION OF MACHINE PARTS
DESCRIPTION OF MACHINE PARTS
DEPICTED CONTENTS
(1) Bucket cylinder
(2) Arm
(3) Bucket link 2 and 3
(4) Bucket link 1
(5) Bucket
(6) Boom cylinder
(7) Swing bracket
(8) Track
(9) Dozer blade
(10) Boom
(11) Arm cylinder
(12) Working light
(13) Canopy
(14) Drive sprocket
(15) Front idler
(16) Dozer cylinder
(17) Cabin
4 INSTRUMENT PANEL AND CONTROL ELEMENTS
INSTRUMENT PANEL AND CONTROL ELEMENTS
B Instrument Panel, Switches
DEPICTED CONTENTS
(1) Cup holder (U35-3S2)
(2) Service port switch
(3) Horn switch
(4) Breaker lock switch
(5) Travel speed switch
(6) Speed indicator light
(7) Starter switch
(8) LCD display
(9) Flow volume setting switch
(10) Switch for Auto idle control
(11) Heater switch (CAB type only)
(12) Emergency engine stop knob
(13) Cup holder (KX91-3S2)
(14) Wiper / Washer switch (CAB type only)
(15) Working Light switch
(16) Service port activation switch
(17) Display selector switch
(18) Warning lamp
5INSTRUMENT PANEL AND CONTROL ELEMENTS
B Control Pedals and Levers
D To prevent inadvertent machine movement, pull the lock lever.
DEPICTED CONTENTS
(1) Drive lever (left)
(2) Lock lever (left)*
(3) Control lever for front attachments (left)
(4) Drive pedal
(5) Drive lever (right)
(6) Lock lever (right) [Only Canopy type]*
(7) Control lever for front attachments (right)
(8) Dozer control lever
(9) Throttle potentiometer
(10) Boom swing pedal
(11) Service port activation switch
6 CHECKS BEFORE START
CHECKS BEFORE START
DAILY CHECKS
In order to avoid damage, it is important to check the
condition of the excavator before starting.
To avoid personal injury:
A Do maintenance work on the excavator only on
level ground with the engine off and the lock
lever in the "Lock" position.
Checks
Go around the excavator and check for visual damage
and wear.
Check coolant level. (See regular checkpoints in the
chapter on maintenance.)
Check fuel level.
Check engine oil level.
Check hydraulic fluid level.
Check air filter for clogging.
Check all control lamps, indicators, tachometer and hour
meter.
Check the light system.
Check the seat belt and the ROPS/FOPS safety device.
Check the condition of the safety and warning labels.
(See "DANGER, WARNING AND CAUTION LABELS" in
"SAFE OPERATION".)
CAB TYPE MACHINES
BWiper/Washer Switch(CAB type only)
Turn the starter switch to position "RUN" and push the
switch for the wiper and washer system; the wiper will
begin to move. A further push on the switch will activate
the washer system.
A Do not activate the switch if the tank for the cleaning
fluid is empty; the pump can be damaged.
A This can also be the case if the wiper is moved on a
dry window. In this case, make sure that cleaning fluid
is applied to the pane before activating the wiper.
A In frosty conditions, make sure that the wiper blade is
not frozen to the glass before switching-on. The motor
can be damaged if the wiper system is used under
such conditions.
BInterior Lamp(CAB type only)
To turn on the interior lamp, set the starter switch to the
"RUN" and then the interior lamp switch to the "ON"
positions, respectively.
(1) Wiper switch
(1) Interior lamp
7CHECKS BEFORE START
BHeater Switch(CAB type)
Turn the starter switch to position "RUN" and turn the
heater switch clockwise, the heater fan will be activated
and the CAB will start to warm up. The heater has two
positions - "Low" and "High" -.
A During the summer, turn the heater valve clockwise to
close the valve.
C Recirculation / Fresh Air Selection knob
A FRESH AIR: Set the knob to the position, and
fresh air will flow into the CAB. This is helpful when you
work in a dusty conditions or if the glass windows get
foggy.
A RECIRCULATION: Set the knob to the position,
and the in-CAB air will be recirculated.This is useful for
heating the CAB quickly or keeping it extra warm.
A When heating, do not keep the knob at the
"RECIRCULATION" position for a long time. The
windshield easily gets foggy.
A While working in a dusty conditions, keep the knob at
the "FRESH AIR" position. This increases the
pressure in the CAB, which helps prevent dust from
coming into the CAB.
(1) Heater switch (A) Pos. "High"
(B) Pos. "Low"
(C) Pos. "Off"
(1) Heater outlet
(1) Heater valve (A) Open
(B) Close
(1) Recirculation/
fresh air selection knob
"FRESH AIR"
"RECIRCULATION"
CHECKS BEFORE START8
BOpening/Closing of CAB Door(CAB type
only)
1. Unlock the CAB door and pull the knob. Open the CAB
door fully until fixed into place.
2. To close the CAB door, push the release lever down
and close the door.
3. When leaving the excavator, always lock the door.
BOpening/Closing of Front CAB
Window(CAB type only)
To avoid personal injury:
A Keep hands and feet away from the area
between front window and CAB frame.
Otherwise the operator risks serious injuries
by pinching or crushing.
A Other persons should stay away when opening
the window.
To open and close the front window, take the steps below.
1. Release the lock levers on the top of the front window.
2. Hold the top and bottom grips tightly with both hands.
Pull the top grip slightly upward and toward yourself to
let the windshield slide inward.
3. Pull the windshield all the way to the rubber at the back
of the CAB. Tighten up the lock levers.
(1) Door knob
(1) Release lever (A) Down
(1) Lock levers (2) Grip
9CHECKS BEFORE START
4. To close the window, take the reverse steps 3, 2 and 1.
BWorking Light Switch
To turn on the working light, set the starter switch to the
"RUN" position and press the working light switch.
BEmergency Hammer(CAB type only)
To avoid personal injury:
A When breaking the window pane, close your
eyes and cover them with an arm.
Emergency hammer is for breaking window pane to
escape urgently away from excavator as a result of
window rail locking mechanism failure.
(1) Lock lever
(1) Working light switch
(1) Emergency hammer
10 OPERATION OF THE ENGINE
OPERATION OF THE ENGINE
To avoid personal injury:
A Read "SAFE OPERATION" at the beginning of
this operator's manual.
A Obey the danger, warning and caution labels
on the excavator.
A To avoid the danger of exhaust fume
poisoning, do not operate the machine in a
closed building without proper ventilation.
A Always start the engine from the operator's
seat. Do not start the engine while standing
next to the excavator. Before starting the
engine, sound the horn to get the attention of
persons standing nearby.
A Do not use starting fluid or ether.
A In order not to overload the battery and starter, avoid
start-ups of more than 10 sec.
A When engine does not start in 10 sec., please wait 20
sec. or more, before attempting to restart.
STARTING THE ENGINE
To avoid personal injury:
A The operator should not depend solely on the
warning lamps, but should always conduct the
routine checks (see "MAINTENANCE").
Start the engine in the following manner:
1. Before starting the engine, make sure that all control
levers are in the neutral positions.
2. Pull the lock levers all the way back. (lock position)
3. Turn the throttle potentiometer towards the
symbol.
(1) Horn switch
(1) Drive lever (left)
(2) Drive lever (right)
(3) Attachment control lever (left)
(4) Attachment control lever (right)
(5) Lock lever (left)
(6) Lock lever (right) (Only Canopy type)
(1) Throttle potentiometer
11OPERATION OF THE ENGINE
4. Insert the key into the starter switch and turn it to the
position "RUN". The LCD display shows the figure
below. The glow lamp will light up while the engine is
preheated and will go out automatically after
preheating is finished.
5. Turn the key to the position "START" and release after
the engine has started.
6. Check if all warning lamps have gone out. Should a
warning lamp still be lit up, stop the engine then
remove the key and check for the cause.
BDisplay Selector Switch
Press the display selector switch while the engine is
running. The LCD meter display will change from one
indication mode to the other.
Change the two-mode display according to your jobs.
A With the starter key at the "STOP" position, press the
electronic meter's display selector switch or the
working light switch, and the LCD display shows the
hour meter, fuel gauge and water temperature gauge
for 10 seconds.
(1) Starter switch (A) "STOP"
(B) "RUN"
(C) "START"
(1) Fuel gauge
(2) Water temperature gauge
(3) Oil lamp
(4) Hour meter
(5) Charge lamp
(6) Glow lamp
(1) Display selector switch
(2) LCD meter display
(1) Fuel gauge
(2) Water temperature gauge
(3) Hour meter
(4) Engine tachometer
(A) "INDICATION MODE 1"
(B) "INDICATION MODE 2"
OPERATION OF THE ENGINE12
BCharge Lamp
This warning lamp lights up if the charging system fails
while the engine is running. When the starter switch is
turned "ON" with the engine off, the lamp lights up, and
when the engine gets started, the lamp goes out.
A If there is disconnection or failure in the charging
system when the key is turned to "RUN", the following
symbol will appear.
BOil Lamp
The engine oil pressure warning lamp lights up due to
failure of the lubricating system with the engine running.
When the starter switch is turned "ON" with the engine
off, this lamp lights up, and when the engine starts, the
lamp goes out. If the lamp stays on with the engine
running, stop the engine and check the engine oil level.
A If there is disconnection, failure or breakdown in the
lubricating system when the key is turned to "RUN",
the following symbol will appear.
BGlow Lamp
With the starter key at the "RUN" position, the engine's
preheat status is indicated.
A When the starter switch is turned to the "RUN"
position, the engine will be preheated for a given
period of time and the lamp will turn on.
A The above indication appears momentarily when the
engine is started, but it does not mean any trouble.
(This is because the oil charge sensor output becomes
unstable when the engine is started.)
A The symbol appears momentarily as the engine
starts. This is not an error.
BLCD Display for Normal Operation
C Fuel gauge
To avoid personal injury:
A Before adding fuel, be sure to stop the engine.
A Be sure to keep open flame away from the
machine. Otherwise a fire may be caused.
With the starter key at the "RUN" position, the fuel
remaining in the fuel tank is indicated in the block.
A If the fuel gauge indicator is near the "E" or the "FUEL"
message appears, add fuel as soon as possible. If the
indicator is near "E" and the machine runs on a slope,
the engine may run out of fuel and get interrupted.
C Fuel supply
The following functions are helpful when adding the fuel.
The fueling progress can be monitored by a buzzer sound.
Procedure
1. Press the work light switch or the display selector
switch on the meter with the key OFF. (Keep the key
at OFF.)
2. The message shown above appears.
3. Add fuel.
4. The buzzer sound interval changes according to the
amount fuel added. As the fuel amount becomes close
to full, the buzzer sound changes to continuous
beeping.
(1) Fuel gauge (A) "Empty"
(B) "Full"
13OPERATION OF THE ENGINE
To avoid personal injury:
A If the fuel is poured too fast, the buzzer may not
sound according to the fueling process.
A The moment when the fuel tank is nearly full,
the buzzer starts beeping.
A Look into the fuel tank when pouring the fuel.
Listen to the buzzer sound for a rough estimate
of the fill-up progress.
C Water Temperature Gauge
To avoid personal injury:
A Do not open the radiator cap during or just after
operation. Hot water may gush out and scald
you. Wait for the water to cool down before
opening the cap.
With the starter key at the "RUN" position, the cooling
water temperature is indicated. If the water temperature
indicator is near "H", take the steps below.
1. Discontinue the job.
2. Reduce engine rpm's to idle and keep it at idle for 5
minutes.
3. Stop the engine and check the following points (1)-(3).
(1) Low coolant level or leak
(2) Fan belt tension
(3) Mud or dust deposits on radiator
C Hour-meter
Indicates the total operating hours of the machine.
How the indicator works
A The meter advances one hour after an hour of
operation regardless of the engine rpm.
C Engine tachometer
Indicates the current rpm of the engine.
A The LCD display may be illegible when viewed from a
certain angle. This is not a display failure.
BLCD Display for Warning
C Remaining fuel warning
When the fuel level is very low, the lamp (yellow) starts
flashing and the following message appears in the
display.
C Battery charge warning
If the charging system fails, the lamp (red) starts
flashing and the following message appears in the
display.
(1) Water temperature gauge (A) "WATER TEMP LOW"
(B) "WATER TEMP HIGH"
OPERATION OF THE ENGINE14
C Engine oil pressure low warning
When the engine oil pressure drops too low, the lamp
(red) starts flashing and the following message appears in
the meter.
Immediately stop the engine and check the engine oil
level.
BWarning Lamp
A The warning lamp is used to indicate broken wire,
short-circuit, fuel shortage and other problems.
A Warnings and errors are displayed and an alarm
buzzer beeps.
A The warning lamp starts flashing in red if any trouble
occurs. If the system gets in warning signal, the
warning lamp starts flashing in yellow.
A Do not just look at the meter, but also carry out the
inspection and correction accordingly.
A Let your KUBOTA dealer inform you of details
concerning care and maintenance.
BCheckpoints after Starting the Engine
After starting the engine, but before starting operation,
check the following points:
1. Turn the throttle potentiometer down and let the
engine idle for approx. five minutes. This allows the
engine lubricant to warm up and penetrate every part
of the engine.
A This idling is usually called "Warm-up".
2. Once the engine has warmed up, check:
A the warning lamp "Engine oil pressure" has gone
out.
A the warning lamp "Battery charge" goes out when
engine speed is increased.
A the color of the exhaust is normal and no abnormal
noises or vibrations are heard or felt.
A no fluid is leaking from pipes or hoses.
C Should any following conditions occur, stop the
engine immediately.
A The engine rpm's increases or decreases suddenly.
A Sudden abnormal noises are heard.
A Exhaust is black.
A Warning lamp for engine oil lights up during operation.
A In these cases, the excavator must be checked and
serviced by your local the KUBOTA dealer.
(1) Warning lamp (red, yellow)
(2) LCD display
15OPERATION OF THE ENGINE
STARTING THE ENGINE UNDER COLD
CONDITIONS
To avoid personal injury:
A Make sure that the lock lever is in the lock
position during warm up.
Start the engine in the following manner;
1. Pull the lock levers all the way back (lock position).
2. Turn the starter switch to the position "RUN" (glow
position) and keep until the indicator lamp has gone
out.
3. Move the starter switch to the position "START"; to
crank and start engine.
4. Release the starter switch after the engine has started;
it will automatically return to the position "RUN ".
A Let the engine warm up after start-up.
A Let the engine warm up after start-up for approx. 10
minutes under no load conditions. If the hydraulic fluid
temperature is too low, the operations will be affected.
Do not operate the excavator under full load before the
engine has warmed up enough.
STOPPING THE ENGINE
To avoid personal injury or death:
A Do not keep the bucket or dozer in the lifted
position, as a person could accidentally touch
the levers and cause serious accidents.
BEmergency Engine Stop Knob
To avoid personal injury:
A Pull the engine stop knob up and hold it until
the engine stops in case of emergency.
The engine stops when the key is turned off. If the engine
does not stop, pull the engine stop knob up and hold it
until the engine stops. After the engine has stopped, be
sure to push the engine stop knob back in, or the engine
will not start next time.
A If the engine does not stop with the key, contact your
KUBOTA dealer.
1. After slowing the engine to idle, turn
the key to "STOP".
2. Remove the key.
(1) Emergency engine stop knob
OPERATION OF THE ENGINE16
STARTING WITH AN AUXILIARY BATTERY
To avoid personal injury:
A Battery gases can explode.
Do not smoke and keep sparks and flames
away.
A Do not start the engine with an auxiliary battery
if excavator battery is frozen.
A Do not connect the black jumper cable to the
negative (-) terminal of the excavator battery.
BObserve Following Guidelines when
Starting with an Auxiliary Battery
1. Bring the helping machine with the same battery
voltage as near as possible to the machine.
THE MACHINES MUST NOT COME IN CONTACT
WITH EACH OTHER.
2. Bring the levers and pedal of both machines in the
neutral position.
3. Wear eye protection and rubber gloves.
4. Ensure the vent caps are securely in place (if
equipped).
5. Connect the terminal of the red jumper cable with the
plus (+) terminal of the low battery and connect the
other end of the cable to the plus (+) terminal of the
auxiliary battery.
6. Connect the black negative cable to the minus (-)
terminal of the auxiliary battery.
7. Connect the other end of the black cable (coming from
the auxiliary battery) to the machine frame as far away
as possible from the low battery.
8. Start the engine of the helping machine and let it run
for a while. Start the machine with the low battery.
9. Disconnect the jumper cables in the reverse
sequence.
A This excavator has a negative (-) earthed 12 Volt
starting system.
A Only use the same voltage when using an auxiliary
battery.
A Using a higher voltage will cause serious damage to
the electrical system. When using an auxiliary battery,
only the compatible (same) voltage is permissible.
(1) Low battery
(2) Auxiliary battery
(3) Jumper cables
17EXCAVATOR OPERATION
EXCAVATOR OPERATION
RUNNING-IN OF THE NEW EXCAVATOR
The operation and care of the new excavator influences
its life span. Your new excavator has been carefully
checked and tested before leaving the factory. In spite of
this, all movable components must run-in during the first
50 work hours. Do not work with full rpm's and full loads
during this period. It is most important to run-in your
excavator properly in order to achieve its full performance
and longevity. During the running-in, the following points
should be adhered to in all cases.
BDo not Work with Full Engine Rpm's or
Full Loads during the First 50 Working
Hours
A Let the engine warm up sufficiently in the cold season.
A Do not let the engine rev-up more than necessary.
BOil Change in the Run-in Stage
The lubrication oil plays a specific and important role
during the run-in phase of the excavator. The numerous
movable parts are not yet run-in, so many fine metal
particles are generated and cause damage and shorten
the life of many components. Pay attention to the oil-
change intervals and complete them sooner than later.
See "REGULAR CHECKS AND MAINTENANCE WORK"
section for more details on the oil-change intervals.
BSeat Belt
To avoid personal injury or death:
A Always use the seat belt with a ROPS/FOPS
protection structure. Adjust the seat to the
optimal position and buckle up.
STARTING
BOperator's Seat
To avoid personal injury:
A Make sure that the seat is completely secured
after each adjustment.
A Do not allow any person other than the driver to
ride on the excavator.
(1) Seat belt
1. Adjusting the Operator's Position.
(1) Backrest tilt adjust lever
(2) Arm rest angle adjust
knob
(3) Weight adjust lever
(4) Height adjust knob
(5) Weight and height
indicator
(6) Travel adjust lever
(7) Arm rest
(A) "UNLOCK"
(B) "TO INCREASE TENSION"
(C) "TO DECREASE TENSION"
(D) "TO INCREASE ANGLE"
(E) "TO DECREASE ANGLE"
EXCAVATOR OPERATION18
C Travel adjustment
Pull the travel adjust lever in the direction of [A] and
slide the seat backward or forward, as required. The
seat will lock in position when the lever is released.
C Weight adjustment
Turn the weight adjust lever to achieve the optimum
suspension setting.
C Tilt adjustment
Pull the backrest tilt adjust lever in the direction of [A]
and move the backrest to the desired angle.
C Height adjustment [KX91-3S2]
Pull up with your hands the seat pan in front of seat
belt to the desired height of the three available
positions.
Once it has reached the highest level, it will return to
the lowest level.
C Arm rest
Arm rest may be set at upright position if desired.
C Arm rest angle adjustment
Turn the arm rest angle adjust knob to the desired
angle.
BLock Lever
To avoid personal injury:
A To avoid injuries, check safety features all
around the excavator.
A With the lock lever pulled down, the engine
fails to start.
If you try to start the engine with the key with the lock lever
down, the following message appears momentarily on the
meter display.
(1) Backrest tilt adjust knob
(2) Weight adjust lever
(3) Travel adjust lever
(4) Arm rest
(5) Seat lock lever
(A) "UNLOCK"
(B) "TO INCREASE TENSION"
(C) "TO DECREASE TENSION"
(D) "TO INCREASE ANGLE"
(E) "TO DECREASE ANGLE"
2. After starting the engine, bring the
lock levers into the "Unlock" position
to use drive lever or control lever for
front attachments.
(1) Lock levers (A) "Unlock"
19EXCAVATOR OPERATION
BWorking Light Switch
When the starter switch is in position "RUN", the light(s)
can be switched on by pressing the switch.
C Night operation
To avoid personal injury:
A Visibility is reduced in darkness, therefore the
work light alone may not be enough. In which
case, prepare additional stationary artificial
lighting, observe safety rules as well as special
regulations for night work.
BTravel Buzzer
When you handle the drive levers, the buzzer sounds at
the same time or before the excavator starts to run.
DRIVING
To avoid personal injury or death:
A Before starting the engine, make sure that no
one is near the excavator.
A Before operating the excavator, check the track
direction. (Front idler and dozer blade to the
front of the excavator).
A Use extra caution when traveling across a
slope or working sideways on a slope.
A Recommended technique for working on a
slope.
(1) Working light switch
EXCAVATOR OPERATION20
1. Adjust the engine speed from idling to an intermediate
speed.
2. Unlock the lock levers and pull in the bucket and hold
the bucket about 20 to 40cm above the ground.
3. Activate the dozer control lever to raise the dozer.
BDrive Levers(Right,Left)
To avoid personal injury or death:
A If the swing frame has been turn 180deg, i.e. the
dozer in relation to the operator's seat is
"behind", then the travel direction is opposite
to the drive direction of the levers (when
activating the drive lever forwards, the
machine, in relation to the operator's seat, will
move backwards).
Pushing the drive lever forwards, moves the excavator
forwards, and vice-versa. The front of the excavator is the
side where the dozer is located; the drive sprocket is in the
rear of the excavator.
(1) Lock lever (A) "Unlock"
(A) 20 to 40 cm
(1) Dozer control lever (A) "Raise"
(B) "Lower"
(A) "Raise"
(B) "Lower"
21EXCAVATOR OPERATION
BTravel Speed Switch
To avoid personal injury:
A When activating the travel speed switch, it
must be pushed down completely.
Travel speed will increase when this switch is pushed
down.
Switching the dual travel speed:
1. Press the travel speed switch. The buzzer beeps and
the travel speed changes from first speed to second.
The symbol lights up.
2. Press the travel speed switch again, and the buzzer
beeps and the travel speed changes from second
speed to first. The symbol light goes out.
A Each time the travel speed switch is pressed, the
travel speed is switched between first and second.
A Do not activate the travel speed switch when there is
increased drive resistance (e.g. driving on inclines or
on uneven grounds).
A If the tracks are clogged with sand or gravel while
working on soft ground, lift up both tracks with the help
of the boom, arm, dozer blade and bucket and let the
track rotate to remove the sand and gravel.
(A) "Forward"
(B) "Backward"
(C) "Straight"
(1) Drive lever (left)
(2) Drive lever (right)
(A) "Forward"
(B) "Backward"
(1) Travel speed switch
(2) Speed indicator light
EXCAVATOR OPERATION22
To avoid serious injury or death:
A Do not work under the machine in this
condition.
TURNS
To avoid personal injury:
A Do not change direction on steep slopes, or the
excavator could tip over.
A Before changing direction, beware of people in
the work area.
BPivot Turn
A Movement as illustrated is done with the dozer blade
in front of the operator.
When the dozer is in the back, the steering direction is
reversed.
(For example, push the left drive lever forward the
excavator turns right; the left track, seen from the
operator, will move backward from the operator.)
C Change of Direction while Travelling
1. While travelling forwards, bring the left drive lever into
the neutral position;
the excavator will turn to the left.
2. While travelling backwards, bring the left drive lever
into the neutral position;
the excavator will turn to the right.
C Change of Direction while Stationary
1. Push the left drive lever forward;
the excavator will turn to the right.
2. Pull the left drive lever backward;
the excavator will turn to the left.
(A) "Rotate to remove sand
and gravel"
(A) "Travelling forward" (N) "Neutral position"
(B) "Travelling backward" (N) "Neutral position"
23EXCAVATOR OPERATION
BSpin Turn
When both drive levers are activated in the opposite
directions, both tracks will rotate with the same speed but
in opposite directions. The center of rotation is the center
of the excavator.
UP AND DOWNHILL DRIVING
To avoid personal injury:
A When traveling up or down a slope, use extra
caution and follow the instructions below.
While traveling uphill, keep the lower edge of the bucket
approx. 20 to 40cm above the ground. Although the
KUBOTA excavator will not slip easily because of the
tracks, it is safer to let the bucket slide over the ground
while traveling downhill. Always choose slow speed for
uphill and downhill traveling.
[UPHILL TRAVELING]
[DOWNHILL TRAVELING]
(A) "Left spin turn"
(B) "Right spin turn"
(A) 20 to 40 cm
EXCAVATOR OPERATION24
OPERATION OF THE DOZER
1. To raise the dozer, pull back the control lever. Pushing
the control lever forwards, lowers the dozer.
2. While undertaking earth moving work, control both
drive levers with the left hand and the dozer control
lever with the right hand.
TWO PATTERN SELECTION
SYSTEM(TPSS)
To avoid personal injury:
A Study control lever pattern A and pattern B.
Then choose the one which is most familiar
A Position the pattern selector lever (located on
the right side of operator's seat) in either the
lower position (pattern A) or the upper position
(pattern B).
A Engage the lock lever to prevent accidental
pattern change.
A Familiarize yourself with the pattern selected
by operating slowly.
BPattern Change
1. Loosen the lock lever knob and slide it to the direction
(a), and position the pattern selector lever to the
desired position.
2. Slide the lock lever knob to the direction (b) and tighten
it.
(1) Dozer control lever (A) "Raise"
(B) "Lower"
(A) "Raise" (B) "Lower"
(1) Pattern selector lever (Two Pattern Selection System: TPSS)
(2) Lock lever knob
25EXCAVATOR OPERATION
OPERATION OF THE BOOM
To raise the boom, pull the attachment control lever back.
The boom is equipped with a cushion cylinder which helps
prevent excavated material in the bucket from falling out.
Low hydraulic oil temperature, (e.g. after starting the
engine in cold weather) the cushioning function will be
effected for a short period of time (approx. 3 to 5
seconds). This condition results from the viscosity of the
hydraulic oil and is not a sign of malfunction.
The cushion cylinder will operate normally as the oil
warms up.
A When lowering the boom, make sure that it does not
hit the dozer and that the bucket teeth do not touch the
dozer.
Lever Position Pattern A Pattern B
Attachment
Control Lever
(Left)
A
B
C
D
Boom down
Boom up
Swing left
Swing right
Arm up
Arm crowd
Swing left
Swing right
Attachment
Control Lever
(Right)
1
2
3
4
Arm up
Arm crowd
Bucket crowd
Bucket dump
Boom down
Boom up
Bucket crowd
Bucket dump
EXCAVATOR OPERATION26
OPERATION OF THE ARM
Pull back the attachment control lever and the arm will be
pulled in. To move the arm out, push the control lever
towards the front.
A When pulling in the arm, the movement may stop for a
short moment when the arm is in its vertical position.
This is caused by the combined load of the arm and
bucket moving the cylinder piston away from the
hydraulic flow causing a delay in the cylinder action,
until the flow catches up with cylinder piston. This is a
characteristic of the hydraulic system and is no sign of
a malfunction.
OPERATION OF THE BUCKET
To dig using the bucket, move the right attachment control
lever from the neutral position, left. Moving the control
lever right, moves the bucket outwards and empties its
contents.
27EXCAVATOR OPERATION
UNIT SWING AND BOOM SWING
OPERATION
To avoid personal injury:
A When working in groups, always let the others
know what you are going to do before you do it.
A Keep others away from the machine working
area.
A Be sure to lock the boom swing pedal when the
boom swing function is not used.
BUnit Swing Operation
1. Move the control lever to the left and the upper
structure will turn to the left.
2. Move the control lever to the right and the upper
structure will turn to the right.
BBoom Swing Operation
1. Tilt the pedal rearward.
2. Step on the left side of the pedal to swing the boom to
the left.
3. Step on the right side of the pedal to swing the boom
to the right.
A Do not operate the left attachment control lever
abruptly from right to left (or vice versa). Because the
low of inertia cause high impact load on the swing gear
and the swing motor, shortening the life of the
excavator.
(1) Boom swing operation pedal
28 EXCAVATOR OPERATION
SERVICE PORT OPERATION
To avoid personal injury:
A In the limited flow volume mode, be careful not to get the arm relieved. The service port will otherwise get fully
open.
A When the lock lever is raised, the service port activation switch is off.
A Let the engine warm up after start-up for approx. 10 minutes under no load conditions.
BService Port Operation
This knob is used to operate hydraulic attachment such as breakers.
29EXCAVATOR OPERATION
C Usual settings
A Action mode of service port operation
It is possible to select from four action modes of the service port operation by pushing the service port activation switch.
Each time the service port activation switch is pushed, the action mode changes from 1 through 4.
A When turning the starter key to the "RUN" position, the action mode will return to the last action mode used.
C Initial setting of limited service port flow volume (Make this setting first.)
30 EXCAVATOR OPERATION
A Setting of limited flow volume
Max. flow volume right and left can be adjusted in 15 stages independently.
31EXCAVATOR OPERATION
A Service Port Max. Flow Volume
Max. Flow Volume
(Theoretical
L /min.)
KX91-3S2 63.0
U35-3S2 60.0
Max. Pressure
MPa
(kgf/cm )
KX91-3S2 23.5 (240)
U35-3S2 24.5 (250)
32 EXCAVATOR OPERATION
A When the service port is not used for a long period, dirt particles can settle in the lower part of the service port lines.
When the plugs on the service port lines are removed to connect attachments, drain approx. 100 cc (3.4 oz) of oil per
side before making connections.
For breaker choices, contact your dealer.
A Do not change the engine rpm using the limited flow volume setting. The service port speed will be otherwise lower, by
which the attachment may get interrupted.
In making the limited flow volume setting, find an optimum setting while varying the engine rpm.
A Suppose that the same attachment is mounted on another machine. Even if the same limit setting is made, the same
speed cannot be achieved. Make an optimum setting on each machine.
BOne Way Flow Operation
33EXCAVATOR OPERATION
1-way or 2-way CIRCUIT SELECTION
VALVE OPERATION
A selection valve which selects 1-way or 2-way circuit of
service port has been installed on the hydraulic tank.
1. When equipment which needs a 1-way circuit will be
used, position the arrow, by using the supplied lever,
on the axis of the selection valve to the 1-way circuit
position , to reduce the back pressure.
2. When equipment which needs a 2-way circuit will be
used, position the arrow on the axis of the selection
valve to the 2-way circuit position.
To avoid personal injury:
A Stop the engine before removing/changing the
equipment.
A Release pressure in the hydraulic system
before removing/chaging the equipment. (See
"HOW TO RELEASE PRESSURE TRAPPED IN
THE HYDRAULIC SYSTEM".)
A Position the selection valve to the correct
position (either 1-way or 2-way circuit
selection) before mounting the equipment.
A Always select the correct valve position (1-way
or 2-way circuit selection) to avoid sudden
movement of the equipment.
A Leaving the selection valve to 1-way circuit selection
and attaching 2-way circuit equipment may cause the
equipment to move (drop) suddenly due to its own
weight, as the tank line remains open, even with the
engine off.
NOTE:
A 1-way circuit..... HAMMER etc.
A 2-way circuit..... THUMB, TILT BUCKET,
AUGER, GRAPPLE etc.
EXCAVATOR OPERATION34
AUTO IDLE (AI) OPERATION
1. Throttle Potentiometer
With this potentiometer the operator can adjust the
engine speed when the Auto Idle control is activated.
2. Switch for Auto Idle (AI) Control
With this switch the Auto Idle control is turned on or off.
The Auto Idle control allows the engine speed to drop
to the engine speed preselected with the
potentiometer after about 4 seconds. If the control
activated, the engine speed rises immediately to the
preset rpm. If the Auto Idle is not activated the throttle
potentiometer can be utilized to control engine speed
similar way to a conventional throttle control lever.
A It is possible that the Auto Idle may not function until
hydraulic oil warms up in the cold weather. Therefore
it is not recommended that the Auto Idle be activated
until the machine is completely warmed up.
A Before operating the control lever, check the Auto Idle
Indicator Lamp.
A When operating in confined spaces or when loading
onto a vehicle, turn the Auto Idle switch off (Light off).
This is to prevent unwanted engine speed increases
when control levers are activated.
A The Auto Idle control, when selected by a switch,
provides the operator with a way to control engine
speed without a Throttle Potentiometer, simply by not
activating any control levers for about four seconds
after stopping work, and then to simply restore a
preset (by potentiometer) engine speed by activating
any control lever to return to work.
A The purpose of system is to reduce fuel consumption,
noise and operator fatigue.
IMPORTANT INFORMATION ON
EXCAVATOR OPERATION
A Do not try to crush concrete or boulders using side
swings with the bucket. Also avoid using side sweeps
of the bucket to move earth piles.
A Under all circumstances avoid the following
operations:
A Excavation using the gravitational impact of the
machine.
A Compacting of gravel or soil using the dropping
action of the bucket.
A Excavation using the traveling power of the
machine.
A Do not try to drop or shake off soil adhering to the
bucket in the manner given in the points below. This
can cause damage to the machine.
Adhering soil can be shaken off when the bucket is
being emptied by moving the bucket out to the
maximum stroke of the cylinder. Should this not
suffice, swing out the arm as far as possible and
operate the bucket back and forth.
A Do not hit the dozer with the boom cylinder!
Make sure that the boom cylinder does not hit the
dozer when doing deep excavation. If necessary
swing around so that the dozer is in the back of the
machine.
A Pay attention when pulling in the bucket!
When pulling in the bucket (for driving or
transportation) avoid hitting the dozer.
A Avoid collisions!
When moving the excavator, pay attention that the
dozer does not collide with obstructions such as
boulders etc..
Such collisions shorten the life of the dozer and the
cylinder substantially.
A Support the machine correctly!
When stabilizing the machine with the dozer, lower the
dozer to engage the full width on the ground.
A If the water or mud level reaches higher than the top of
the tracks, the swivel bearing, swivel motor gear and
ring gear may be exposed to mud, water and other
foreign objects.
The excavator must be properly pressure washed
after each use.
A Thoroughly clean the area around the swivel
bearing, swivel motor gear and ring gear to remove
foreign objects.
A Inspect the swivel motor oil sump (if equipped) for
water contamination. If water is present, refer to
operator's manual for lubricant replacement
procedure.
A Refer to operator's manual for proper swivel
bearing, swivel motor gear and ring gear
lubrication procedures.
A Reinstall any protective covering if removed
earlier.
(1) Throttle potentiometer
(2) Switch for Auto Idle control
35EXCAVATOR OPERATION
HOW TO RELEASE PRESSURE TRAPPED
IN THE HYDRAULIC SYSTEM
A Lower the attachments and the dozer blade to the
ground.
A Turn the key to "STOP" position and shut off the
engine.
A After stopping the engine, turn the key to "RUN"
position.
A Release pressure in the hydraulic system by operating
levers with lever lock pulled down.
36 TRANSPORTING THE EXCAVATOR ON A VEHICLE
TRANSPORTING THE EXCAVATOR ON A VEHICLE
To avoid personal injury or death:
A No directional changes should be made when
the excavator is on the ramp. Should a change
of direction be necessary, drive off the ramp
completely and make the turn.
A When driving forwards or backwards onto the
vehicle, or when swinging the upper body,
make sure that neither the CAB or the gates of
the vehicle will be damaged.
A When the excavator reaches the point between
the ramps and the bed, halt and then move very
slowly until the excavator reaches the
horizontal position.
A Move the excavator onto the vehicle only with
the arm completely pulled in. Otherwise the
CAB of the vehicle could be damaged when
swinging around the upper body.
A Do not jack up the machine using its boom to
load or unload the excavator from the vehicle.
Doing this is dangerous.
A Make sure the ramp are of sufficient capacity
and securely connected to the vehicle to safety
support the machine throughout the loading /
unloading operation.
B Transporting on a truck
To avoid personal injury or death:
A After loading the machine on the truck, lower
the bucket and dozer onto the truck bed. Lock
the swing frame with the swing lock pin.
Prepare a platform to load or unload the excavator.
Take following steps when using ramps.
1. Apply the parking brakes of the vehicle, and block the
drive wheels from both sides.
2. Use mounting brackets secure the ramp properly.
Connect the ramps directly to the bed.
3. For additional safety, use blocks or supports under the
ramps and the bed.
37TRANSPORTING THE EXCAVATOR ON A VEHICLE
4. Completely align the ramps and the tracks and then
drive the excavator slowly up the ramps with the dozer
in the front. After ensuring that the tracks are
completely on the bed, swing the upper body around
to the back of the vehicle.
5. Block the tracks and chain down the excavator with
suitable chains and approved method (check
appropriate state regulation).
6. Before unloading, raise the dozer and bucket from the
bed.
38 LIFTING OF THE EXCAVATOR
LIFTING OF THE EXCAVATOR
To avoid serious injury or death:
A The correct instructions for safe handling are
described here. Read these instructions
carefully before moving the machine. Make
sure that the operating personnel read the
operator's manual carefully.
B Basics when Lifting with Cables or Straps
1. The lifting and crane operation is to be undertaken
according to the safe operation guidelines described.
2. The equipment used for lifting mentioned in these
instructions are only given as reference, the standards
concerning strength, control and other details are
based on the respective applicable guidelines.
B Safety Aspects when Lifting with Cables or Straps
Abide by following steps when lifting:
1. Do not lift loads that exceed the maximum load
capacity of the crane.
2. Choose correct equipment suitable to the weight, size
and form of the load.
3. First assess the center of gravity of the load, position
the hook directly over the load and lift the load so that
the center of gravity of the load is as low as possible.
4. The steel cables or straps must be fixed in the middle
of the hook.
5. The load must be lifted vertically from the ground.
6. Do not enter the working area under suspended loads
and do not move the load over people. The load must
only be moved in an area where the balance can be
easily maintained.
B Lifting Procedure for the Excavator
To avoid personal injury or death:
A Do not use the hooks on the roof of canopy and
CAB for lifting the excavator.
C General guidelines for lifting
1. Lifting position. (see the following illustration.)
(1) Pull in the boom completely towards the CAB.
(2) Pull in the arm completely.
(3) Pull in the bucket completely.
(4) Adjust the swing angle to the center. (to bring the
boom in a position parallel to the machine frame)
(5) Swing frame so that dozer blade is to the rear and
frame is parallel with tracks.
(6) Raise the dozer blade fully.
2. Attaching the steel cables or straps.
(1) Always hook the excavator at three points. (one
on the boom and left and right of the dozer)
(2) Always use a shackle on each lifting hole when
attaching the cables or straps.
(3) Using protective material at all places where the
cables or straps contact the machine.
(4) Keep the angle between the front and rear cables
or straps within 60 (1.05 rad.).
To avoid personal injury or death:
A Never lift the excavator by hooking the hole of
the boom only.
39LIFTING OF THE EXCAVATOR
3. Tackle
The weights of the excavators and the recommended
tackle for lifting these loads are mentioned in the
following table. Choose components having enough
strength.
*Excavator Weight: With CAB, steel tracks, and long
arm.
Steel cable: 6 x 24
4. Lifting
(1) Lift slowly and safely
(2) Do not enter the excavator area when lifting.
(3) Lift the excavator horizontally. (Modify wire
connections according to needs)
Maximum strength
for example : (JIS G 35 25) - "6 x24"
1. Boom side
Hook in the steel cable with a shackle into the lifting
hole.
2. Dozer side
Hook in the steel cable with a shackle into the lifting
hole around the CAB or canopy.
3. Lifting
KX91-3S2 U35-3S2
Excavator
Weight*
kg 3330 3750
Load / Cable
N
(kgf)
12560
(1286)
11174
(1139)
Minimum
Cable
Diameter
(Safety
factor=6)
mm
14
(9/16)
or more
14
(9/16)
or more
Diameter zinc-plated not zinc-plated
10 mm
(3/8)
KN
(kgf)
45.8
(4670)
49.3
(5027)
12.5 mm
(1/2)
KN
(kgf)
71.5
(7291)
77
(7852)
14 mm
(9/16)
KN
(kgf)
89.7
(9147)
96.6
(9850)
16 mm
(5/8)
KN
(kgf)
117
(11931)
126
(12848)
18 mm
(45/64)
KN
(kgf)
148
(15092)
160
(16315)
(1) Steel cable
(2) Shackle
(1) Steel cable
(2) Shackle
(1) Protective material
42 MAINTENANCE
First operation
*1 When using a hydraulic breaker, change hydraulic oil and return filter according to the table on "Hydraulic Oil Change
(Including Exchange of the Suction Filter in the Hydraulic Tank) under "EVERY 1000 SERVICE HOURS" in the chapter
"REGULAR CHECKS AND MAINTENANCE WORK".
*2 Clean and replace the air filter more frequently if used under dusty conditions. When the filter is very dirty from dusty
conditions, replace the filter.
*3 Replace only if necessary.
*4 Consult your local KUBOTA Dealer for this service.
A The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S.EPA non-
road emission regulation. As the engine owner, you are responsible for the performance of the required
maintenance on the engine according to the above instruction. Please see the Warranty Statement in detail.
43MAINTENANCE
OPENING AND CLOSING OF PARTS
BOpening and Closing of the Fuel Tank Cap
1. Open the tank cap cover, insert the starter key and
turn counterclockwise. Then turn the tank cap counter-
clockwise to open.
2. To close the tank cap, turn clockwise and turn
clockwise the starter key. Then close the tank cap
cover.
BOpening/Closing of the Engine Hood
To avoid personal injury:
A Do not open the engine hood with the engine
running unless in an emergency.
A Do not touch the exhaust muffler or the
exhaust pipe; serious burns can occur.
Insert the key into the key hole and turn it clockwise to
open the hood. To close it, lower the bonnet and hold it
down tightly. Turn the key counter-clockwise to lock the
hood.
BOpening/Closing of the Side Hood
1. Raise the catch lever to unlock the side hood.
2. Push the side hood all the way forward, and it will be
held by a restraint cable.
3. For closing pull the side hood all the way back, and pull
down the catch lever to lock the side hood.
(1) Starter key
(2) Fuel tank cap
(3) Tank cap cover
(1) Fuel tank cap
(1) Key (A) Unlock
(B) Lock
(1) Catch lever
(2) Side hood
(3) Rear Hood
MAINTENANCE44
BWhere to store the Tool and the Grease
Gun
[KX91-3S2]
1. Remove the mat and the cover of left side step.
2. Store the tools or grease gun in the storage box.
[U35-3S2]
1. Pull the seat lock lever and tilt over the seat forward.
2. Store the tools in the storage box.
To avoid personal injury:
A Stop the engine and remove the key before
tilting the seat.
BWhere to keep Operators Manual
(1) Box for storage
(1) Grease gun (Option)
(1) Tool box
(1) Operator's manual storage
(1) Operator's manual storage
45MAINTENANCE
DAILY CHECKS
For your own safety and to assure the long life of your
machine, a careful check should be made before each
operation.
BChecking Coolant Level
To avoid personal injury:
A Move the excavator to even ground.
A Make sure that the engine is turned off.
A Do not open the radiator cap right after the
engine has been stopped; Serious burns can
occur from contact with escaping hot coolant
fluid.
A Check the coolant level in the reserve tank only
after the engine has cooled down.
A Remove the radiator cap only if absolutely
necessary.
1. Check to see that the coolant level is between the
"FULL" and "LOW" marks of a reserve tank.
2. When the coolant level drops due to evaporation, add
water only up to the full level.
In case of leakage, add anti-freeze and water in the
specified mixing ratio up to the full level.
(See "Changing Radiator Coolant " in every 2 years
maintenance.)
A Do not fill the reserve tank over the "FULL" marking.
A Do not fill with dirty or salty water.
BChecking Fuel Level
To avoid personal injury:
A Stop the engine and remove the key before
fuelling.
A Do not smoke while fuelling.
A By temperatures over -5 (23 ), use No.2-D diesel
fuel, when temperatures are under -5 (23 ), use
No.1-D diesel fuel.
A Make sure that the fuel tank is not run empty. Air will
enter the fuel system, and must be purged before
restarting.
A To prevent condensation (water) accumulations in the
fuel tank, fill the fuel into the tank before parking
overnight.
A Always fill up the fuel after a day's work.
A See "PURGING OF THE FUEL SYSTEM" in "OTHER
ADJUSTMENTS AND REPLACEMENTS".
1. Check the fuel level by the fuel level indicator.
2. Open the tank cap with the starter key, and add fuel.
(1) Reserve tank (A) "FULL"
(B) "LOW"
(1) Fuel level indicator
MAINTENANCE46
A See "Opening and Closing of the Fuel Tank Cap" and
"LCD Display for Normal Operation."
BChecking Engine Oil Level
To avoid personal injury:
A Stop the engine and remove the key before
checking the oil level.
Insert the engine oil dipstick fully into the respective port
opening, remove again and check the oil level; if
necessary fill with oil. The machine must be on level
ground when checking the oil level.
A Use engine oil with the correct viscosity. (according
the outside temperature.)
A After stopping the engine and removing the key, wait
five minutes and then check oil level. The excavator
must be on level ground.
BChecking Hydraulic Oil Level
To avoid personal injury:
A Stop the engine and remove the key before
checking the oil level.
A Before filling oil, wipe away all sand and dust from
around the oil port. Make sure to use an identical type
of hydraulic fluid.
A The excavator has been filled with hydraulic fluid
before delivery. See "RECOMMENDED OILS".
(Do not mix different oils.)
1. Park the excavator on a firm, flat and level surface.
Lower the attachments and dozer blade to the ground
and stop the engine.
2. Check the oil level as to whether it lies on the center of
the gauge at normal temperature (10 to 30 (50 to
80 )).
3. Enough oil is present if the oil level lies near the center
of the gauge.
4. Should the oil level be too low, fill oil through the oil
port before starting the engine. This step is important
for the protection of the hydraulic system.
(1) Fuel tank cap
(1) Engine oil dipstick
(2) Filling port
(A) Oil level is acceptable
within this range.
(1) Tank cap (2) Gauge
47MAINTENANCE
BLubrication Points
To avoid personal injury:
A First lower all attachments to the ground then
stop the engine and remove the key.
A While greasing, take caution not to step on the
bucket teeth.
A When doing excavation work in water,
generously grease the following points. After
ending work, grease again.
Grease the marked grease nipples shown by arrows in the
illustration below.
1. Boom bottom linkage............................. 1 place
2. Arm bottom linkage................................ 1 place
3. Bucket link pin........................................ 4 places
4. Boom cylinder boss............................... 2 places
5. Arm cylinder boss.................................. 2 places
6. Bucket cylinder boss.............................. 1 place
7. Fixing pin between arm and bucket........ 1 place
8. Boom swing fulcrum.............................. 2 places
9. Swing cylinder boss............................... 1 place
10. Swing cylinder pin.................................. 1 place
11. Dozer cylinder boss............................... 2 places
12. Dozer linkage pin................................... 2 places
49REGULAR CHECKS AND MAINTENANCE WORK
REGULAR CHECKS AND MAINTENANCE WORK
EVERY 50 SERVICE HOURS
BDraining Fuel Tank
To avoid personal injury:
A Before draining the fuel tank, be sure to stop
the engine and remove the key.
A Do not smoke during inspection.
1. Remove the drain plug on the underside of the body
and drain water.
2. Re-tighten the drain plug.
BDraining Water Separator
1. Open the hood.
2. When the separated water enters the cup, the red float
moves upwards.
When the float reaches the line, close the cock so that
no fuel can run out. Now loosen the ring nut, and
remove the cup and empty completely.
3. Finally, do not forget to open the cock and replace the
left side cover.
BBattery
To avoid the possibility of a battery explosion:
For refillable type battery, follow the instructions
below.
A Do not use or charge the refillable type battery
if the fluid level is below the LOWER (lower limit
level) mark. Otherwise, the battery component
parts may prematurely deteriorate, which may
shorten the battery's service life or cause an
explosion. Check the fluid level regularly and
add distilled water as required so that the fluid
level is between the UPPER and LOWER levels.
To avoid personal injury:
A Never remove the vent caps while the engine is
running.
A Keep electrolyte away from eyes, hands and
clothes. If you are spattered with it, wash it
away completely with water immediately and
get medical attention.
A Wear eye protection and rubber gloves when
working around the battery.
A Before inspection or dismounting the battery,
be sure to turn off the engine and turn the
starter switch to the "OFF" position.
A When removing the battery, always disconnect
the negative ground cable first. When installing
a battery, always connect the ground cable
last. This prevents a possible explosion caused
by sparks.
(1) Drain plug
(1) Ring nut
(2) Cup
(3) Cock
(4) Float
(5) Line
REGULAR CHECKS AND MAINTENANCE WORK50
A Always wear eye protection when working with
the battery.
1. Remove the mat and cover of left side step, check the
battery fluid level and add distilled water if necessary.
2. If battery fluid be spilt, fill with sulfuric acid solution of
the same concentration.
3. Clean the battery caps (ventilation holes) also.
A When filling battery fluid or distilled water,clean
trash,dust,etc off the top of battery before opening
the battery cap.
BBattery Charging
To avoid personal injury:
A When the battery is being activated, hydrogen
and oxygen gases in the battery are extremely
explosive. Keep open sparks and flames away
from the battery at all times, especially when
charging the battery.
A When charging battery, make sure battery vent
plugs are securely.
A When disconnecting the cable from the battery,
start with the negative terminal first.
When connecting the cable to the battery, start
with the positive terminal first.
A Do not check battery charge by placing a metal
object across the terminals.
Use a voltmeter or hydrometer.
1. Make sure each electrolyte level is to the bottom of
vent wells. If necessary, add distilled water in a well-
ventilated area.
2. The water in the electrolyte evaporates during
recharging. Liquid shortage damages the battery.
Excess liquid spillage damages the excavator.
3. To slow charge the battery, connect the battery
positive terminal to the charge positive terminal and
the negative to the negative, then recharge in the
standard fashion.
4. A boost charge is only for emergencies. It will partially
charge the battery at a high rate and in a short time.
When using a boost-charged battery, it is necessary to
recharge the battery as early as possible.
Failure to do this will shorten the battery's service life.
5. When the specific gravity of electrolyte falls between
1.27 and 1.29 charge has completed.
6. When exchanging an old battery for a new one, use a
battery of equal specification.
(1) Battery (2) Indicator
(A) Battery fluid level
(B) "Too low"
(C) "Correct"
(D) "Too high"
OTHER ADJUSTMENTS AND REPLACEMENTS64
BAuxiliary Electric
Max power is less than 110 W including the equipped light
55 W.
BSlow Blow Fuse
Slow blow fuse is provided to protect the electrical circuits.
If the fusible link is blown, check the electrical circuits for
trouble and then replace with a new compatible slow blow
fuse.
(1) Fuse box
(2) Auxiliary electric A
(1) Fuse box
(2) Auxiliary electric A
(1) Slow blow fuse (50 A)
(1) Slow blow fuse (60 A)
65TROUBLESHOOTING
TROUBLESHOOTING
If the mini-excavator does not show the desired performance, or when trouble arises, refer to the table below and undertake
appropriate measures.
Trouble Cause Countermeasure
Engine
Starting
difficulties
Lock levers in "UNLOCK"
position
* Bring lock lever into "LOCK" position.
Fuel is too viscous.
* Check fuel tank and filter.
* Remove impurities and water.
* If necessary, replace filter.
Air or water in the fuel
system
* Remove water from the fuel tank.
* Check fuel pipe joint bolts and nuts for looseness.
* Purging of the fuel system (for fuel filter and injection pump,
see "PURGING FUEL SYSTEM" in the chapter.
"OTHER ADJUSTMENTS AND REPLACEMENTS".)
Oil viscosity is so high that
the engine runs sluggishly
in winter.
* Pour hot water over the radiator.
Battery is almost dead;
insufficient compression.
* Recharge battery.
Insufficient
engine power
Low fuel level * Check fuel and add if necessary.
Clogged air cleaner * Clean the air filter element.
Engine suddenly
stops.
Low fuel level
* Check fuel and add if necessary.
* Purge the fuel system.
Abnormal
exhaust gas
color
Poor fuel * Use high quality fuel.
Too much engine oil * Drain engine oil to prescribed oil level.
Water
temperature
in red zone
(Overheating)
Defective seal of the water
pump
* Replace.
Worn or torn fan belt * Adjust or replace.
Thermostat is defect. * Replace.
Coolant level too low * Fill to prescribed level.
Radiator grill or fins are
clogged.
* Clean.
Coolant is contaminated
with rust from the cylinder
head or crank case.
* Replace coolant fluid and add anti-rust.
Defective radiator cap
(Evaporation)
* Replace.
Corroded coolant pipes * Clean.
Continuous operation
under full load
* Reduce load.
85

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U ontvangt de handleiding per email binnen enkele minuten. Als u geen email heeft ontvangen, dan heeft u waarschijnlijk een verkeerd emailadres ingevuld of is uw mailbox te vol. Daarnaast kan het zijn dat uw internetprovider een maximum heeft aan de grootte per email. Omdat hier een handleiding wordt meegestuurd, kan het voorkomen dat de email groter is dan toegestaan bij uw provider.

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Stel uw vraag over deze PDF

Uw handleiding is per email verstuurd. Controleer uw email

Als u niet binnen een kwartier uw email met handleiding ontvangen heeft, kan het zijn dat u een verkeerd emailadres heeft ingevuld of dat uw emailprovider een maximum grootte per email heeft ingesteld die kleiner is dan de grootte van de handleiding.

Er is een email naar u verstuurd om uw inschrijving definitief te maken.

Controleer uw email en volg de aanwijzingen op om uw inschrijving definitief te maken

U heeft geen emailadres opgegeven

Als u de handleiding per email wilt ontvangen, vul dan een geldig emailadres in.

Uw vraag is op deze pagina toegevoegd

Wilt u een email ontvangen bij een antwoord en/of nieuwe vragen? Vul dan hier uw emailadres in.



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