Handleiding Makita HR 3550C (pagina 9 van 23) (Nederlands, Duits, Engels, Frans, Italiaans, Portugees, Spaans, Deens, Zweeds, Noors, Fins)

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Hammer drilling operation (Fig. 15)

CAUTION:

When the bit begins to break through concrete or if

the bit strikes reinforcing rods embedded in concrete,

the tool may react dangerously. Maintain good

balance and safe footing while holding the tool

firmly with both hands to prevent dangerous reaction.

Set the change lever and the shift lever to the

symbol. Position the bit at the location for the

hole, then pull the trigger. Do not force the tool.

Light pressure gives best results. Keep the tool

in position and prevent it from slipping away from the

hole.

Do not apply more pressure when the hole becomes

clogged with chips or particles. Instead, run the

tool at an idle, then remove from the hole. By

repeating this several times, the hole will be cleaned

out.

Torque limiter

The torque limiter will actuate when a certain torque

level is reached. The motor will disengage from the

output shaft. When this happens, the bit will stop

turning.

CAUTION:

As soon as the torque limiter actuates, switch off the

tool immediately. This will help prevent prema-

ture wear of the tool.

Chipping/Scaling/Demolition (Fig. 16)

Set the change lever and the shift lever to the

symbol. Hold the tool firmly with both hands.

Turn the tool on and apply slight pressure on the

tool so that the tool will not bounce around,

uncontrolled. Pressing very hard on the tool will

not increase the efficiency.

Drilling operation (Fig. 17)

Use the optional drill chuck assembly. When installing

it, refer to ‘‘Installing or removing drill bit’’ described on

the previous page. You can drill up to 13 mm diameter

in metal and up to 30 mm diameter in wood.

Set the change lever and the shift lever to the

symbol.

•

Drilling in wood

When drilling in wood, best results are obtained with

wood drills equipped with a guide screw. The guide

screw makes drilling easier by pulling the bit into the

workpiece.

•

Drilling in metal

To prevent the bit from slipping when starting a hole,

make an indentation with a centerpunch and ham-

mer at the point to be drilled. Place the point of the

bit in the indentation and start drilling.

Use a cutting lubricant when drilling metals. The

exception is brass which should be drilled dry.

CAUTION:

•

Pressing excessively on the tool will not speed

up the drilling. In fact, this excessive pressure will

only serve to damage the tip of your bit, decrease

the tool performance and shorten the service

life of the tool.

•

Never use ‘‘rotation with hammering’’ when the drill

chuck assembly is installed on the tool. The

drill chuck assembly may be damaged.

Depth gauge (Fig. 18)

The depth gauge is convenient for drilling holes of

uniform depth. Loosen the clamp screw and adjust

the depth gauge to the desired depth. After adjusting,

tighten the clamp screw firmly.

NOTE:

The depth gauge cannot be used at the position

where the depth gauge strikes against the gear

housing/motor housing.

Indicator lamp (Fig. 19)

The green power-ON indicator lamp lights up when

the tool is switched ON. If the indicator lamp is lit

but the tool does not start, the carbon brushes

may be worn out, or the electric circuit or the motor

may be defective. If the indicator lamp does not light

up and the tool does not start, the ON/OFF

switch or the mains cord may be defective.

The red service indicator lamp lights up when the

carbon brushes are nearly worn out to indicate that

the tool needs servicing. After approx. 8 hours of

use, the motor will automatically be shut off.

MAINTENANCE

CAUTION:

Always be sure that the tool is switched off and

unplugged before carrying out any work on the

tool.

Replacement of carbon brushes (Fig. 20 & 21)

Whenever carbon brushes must be replaced, they cut

out the tool automatically. When this occurs,

remove the screws which secure the brush holder

cover. Remove the brush holder cover and brush

holder cap. Then replace both carbon brushes at the

same time. Use only identical carbon brushes.

Lubrication

This tool requires no hourly or daily lubrication

because it has a grease-packed lubrication system.

Lubricate the tool every time the carbon brushes

are replaced.

Run the tool for several minutes to warm it up.

Switch off and unplug the tool.

Loosen the six screws and remove the handle. Note

that the top screws are different from other screws.

(Fig. 22)

HR3550C (E) (’100. 8. 21)

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