Handleiding Hitachi DH40FR (pagina 9 van 54) (Nederlands, Duits, Engels, Frans, Italiaans, Portugees, Spaans)

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⅜ Remove the core bit shank from the rotary hammer,

hold the core bit with one hand, and strongly strike

the head of the spline portion of the core bit shank

with a manual hammer two or three times, whereby

the round head screw is loosened and the rotary

hammer is ready for disassembly. (Fig. 18)

HOW TO REPLACE GREASE

This machine is of full air-tight construction to protect

against dust and to prevent lubricant leakage. Therefore,

the machine can be used without lubrication for long

periods. Replace the grease as described below.

1. Grease replacement period

After purchase, replace grease after every 6 months

of usage. Ask for grease replacement at the nearest

Hitachi authorized Service center. Proceed for

replacement of grease.

2. Grease replenishment

CAUTION

Before replenishing the grease, turn the power off and

pull out the power plug.

(1) Remove the crank cover and wipe off the grease

inside. (Fig. 19)

(2) Supply 30g of Hitachi Electric Hammer Grease A

(Standard accessory, contained in tube) to the crank

case.

(3) After replenishing the grease, install the crank cover

securely.

NOTE

The Hitachi Electric Hammer Grease A is of the low

viscosity type. If necessary purchase from an Hitachi

authorized Service center.

MAINTENANCE AND INSPECTION

1. Inspecting the tool

Since use of a dull tool will degrade efficiency and

cause possible motor malfunction, sharpen or replace

the tool as soon as abrasion is noted.

2. Inspecting the mounting screws

Regularly inspect all mounting screws and ensure that

they are properly tightened. Should any of the screws

be loose, retighten them immediately. Failure to do

so could result in serious hazard.

3. Maintenance of the motor

The motor unit winding is the very “heart” of the

power tool. Exercise due care to ensure the winding

does not become damaged and/or wet with oil or

water.

4. Inspecting the carbon brushes (Fig. 20)

The Motor employs carbon brushes which are

consumable parts. When they become worn to or near

the “wear limit”, it could result in motor trouble. When

an auto-stop carbon brush is equipped, the motor will

stop automatically. At that time, replace both carbon

brushes with new ones which have the same carbon

brush Numbers shown in the figure. In addition,

always keep carbon brushes clean and ensure that

they slide freely within the brush holders.

5. Replacing carbon brushes

Loosen the two set screws and remove the tail cover.

Remove the brush caps and carbon brushes. After

replacing the carbon brushes, tighten the brush caps

securely and install the tail cover with securely

tightening two set screws.

CAUTION

When the warming up operation is performed, hold

the side handle and the main body securely with both

hands to maintain a secure grip and be careful not to

twist your body by the jammed drill bit.

DRILLING AND DRIVING-IN OPERATIONS FOR

ANCHORS

1. When a taper shank adapter is used. (Fig. 11)

(1) Install drill bit with taper shank in the taper shank

adapter.

(2) Turn the power on and drill a base hole to the depth

sounded by indicating groove on the drill bit.

(3) After cleaning out dust with a syringe, attach the plug

to the anchor tip and drive in the anchor with a manual

hammer.

(4) To remove the drill bit (taper shank), insert the cotter

into the slot of the taper shank adapter and strike the

head of the cotter with a manual hammer supporting

on a rest. (Fig. 12)

HOW TO HANDLE A CORE BIT

When a core bit is used, large diameter holes and blind

holes can be drilled. In this case, use optional accessories

for core bits (such as a center pin and core bit shank) for

more efficient operation.

1. Mounting

CAUTION

Prior to mounting a core bit, always disconnect the

plug from the power supply receptacle.

(1) Mount the core bit on the core bit shank. (Fig. 13)

Before that, feed oil to the screw portion of core bit

shank for easy dismounting.

(2) Mount the core bit shank on the main body in the

same manner as in mounting the drill bit and the bull

point. (Fig. 14)

(3) Insert the center pin into the guide plate until it reaches

the extremity.

(4) Fit in the guide plate by aligning its concaved portion

with the core bit tip. When the position of the concave

is shifted by turning the guide plate right or left, the

guide plate never slips off even when the drill is used

in a downward direction. (Fig. 15)

2. Drilling holes

(1) Insert the plug into a receptacle.

(2) A spring is built in the center pin. By straightly and

gently pressing it to the wall or floor surface, the entire

surface of the core bit tip attains contact to start the

hole drilling job. (Fig. 16)

(3) When the hole depth reaches approximately 5 mm,

the hole position can be determined. Then remove

the center pin and guide plate from the core bit and

continue the hole drilling job.

CAUTION

When removing the center pin and guide plate, always

disconnect the plug from the receptacle.

3. How to dismount the core bit

⅜ By holding the rotary hammer (with the core bit

inserted) in an upward position, drive the rotary

hammer to repeat impact operation two or three

times, whereby the screw is loosened and the rotary

hammer becomes ready for disassembly. (Fig. 17)

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