Handleiding Makita HR 3850K (pagina 6 van 10) (Nederlands, Duits, Engels, Frans, Italiaans, Portugees, Spaans, Deens, Zweeds, Noors, Fins)

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Installing or removing drill bit or other bits

(bull point, etc.) (Fig.3&4)

Important:

Always be sure that the tool is switched off and

unplugged before installing or removing the bit.

Press in the tool retainer and turn it until the red dots

on the tool retainer and the tool holder are aligned.

Release the tool retainer. (Fig. 3)

Insert the bit into the tool holder as far as it will go.

Press in the tool retainer and turn it a full 180 degrees.

Then release it to secure the bit. (Fig. 4)

CAUTION:

Never useA-type shank bits. They can cause damage

to the tool.

To remove the bit, follow the installation procedure in

reverse.

Selecting action mode (Fig. 5)

(Not available for HR3520B)

Rotation with hammering:

For drilling in concrete, masonry, etc., rotate the

change lever to the

position.

Hammering only:

For chipping, scaling or demolition operations, rotate

the change lever to the

position.

CAUTION:

•

Do not rotate the change lever when the tool is

running under load. The tool will be damaged.

•

To avoid rapid wear on the mode change mecha-

nism, be sure that the change lever is always

positively located in one of the two action mode

positions.

Adjusting depth of drilling (Fig. 6)

Loosen the wing bolt and adjust the depth gauge to

the desired depth. After adjusting, tighten the wing

bolt.

Switch action (Fig. 7)

CAUTION:

•

Before plugging in the tool, always check to see that

the switch trigger actuates properly and returns to

the “OFF” position when released.

•

Do not tape, tie or otherwise secure the trigger in

the “ON” position.

To start the tool, simply pull the trigger. Release the

trigger to stop.

Hammer drilling operation

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.

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 bal-

ance and safe footing while holding the tool firmly with

both hands to prevent dangerous reaction.

Chipping / Scaling / Demolition

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.

Core bit (optional accessory)

When using the center bit

Screw the core bit on the adapter. Install the adapter

with the core bit in the tool in the same manner as a

drill bit. (Fig. 8)

Install the center bit. (Fig. 9)

Rest the core bit on the concrete and turn the tool on.

Once the core bit has cut a shallow groove into the

concrete, remove the center bit. Then resume drilling.

To remove the core bit, follow the procedures (1)

or (2).

(1) Rotate the change lever to the

position. Then

rest the core bit on the concrete and turn the tool

on. The core bit will come loose from the hammer-

ing action. (Fig. 10)

(2) Hold the adapter with the wrench, insert the rod

(optional accessory) into the hole in the core bit

and tap with a hammer to unscrew. (Fig. 11)

When not using the center bit

Screw the core bit on the adapter. Install the adapter

with the core bit in the tool in the same manner as a

drill bit. (Fig. 8)

Rotate the change lever to the

position. Rest the

core bit on the concrete and turn the tool on. Once the

core bit has cut a shallow groove into the concrete,

rotate the change lever to the

position and resume

drilling.

NOTE:

No problem is caused even if the core bit unscrews

slightly during brief use since the core bit rotates in

the tightening direction.

To remove the core bit, follow the same removal

procedures covered in When using the center bit.

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