Bedienungsanleitung Makita BHP 451 (Seite 7 von 56) (Deutsch, Englisch, Holländisch, Dänisch, Französisch, Italienisch)

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• Use the reversing switch only after the tool comes to a

complete stop. Changing the direction of rotation

before the tool stops may damage the tool.

• When not operating the tool, always set the reversing

switch lever to the neutral position.

Speed change (Fig. 5)

This tool has a three-gear speed change lever. To change

the speed, first switch off the tool and then slide the speed

change lever to the “1” position for low speed, “2” position

for medium speed or “3” position for high speed. Be sure

that the speed change lever is set to the correct position

before operation. Use the right speed for your job.

NOTE:

• When changing the position from “1” to “3” or from “3”

to “1”, it may be a little difficult to slide the speed

change lever. At this time, switch on and run the tool for

a second at the “2” position, then stop the tool and slide

to your desired position.

CAUTION:

• Always set the speed change lever fully to the correct

position. If you operate the tool with the speed change

lever positioned halfway between the “1” position, “2”

position and “3” position, the tool may be damaged.

• Do not use the speed change lever while the tool is

running. The tool may be damaged.

Selecting the action mode (Fig. 6)

This tool employs an action mode change lever. Select

one of the three modes suitable for your work needs by

using this lever.

For rotation only, slide the lever so that it points toward

the mark on the tool body.

For rotation with hammering, slide the lever so that it

points toward the mark on the tool body.

For rotation with clutch, slide the lever so that the it points

toward the mark on the tool body.

NOTE:

• When changing the position from “ ” to “ ”, it may be

a little difficult to slide the mode change lever. At this

time, switch on and run the tool for a second at the “ ”

position, then stop the tool and slide to your desired

position.

CAUTION:

• Always set the lever correctly to your desired mode

mark. If you operate the tool with the lever positioned

halfway between the mode marks, the tool may be

damaged.

Adjusting the fastening torque (Fig. 7)

The fastening torque can be adjusted in 16 steps by

turning the adjusting ring so that its graduations are

aligned with the arrow on the tool body. The fastening

torque is minimum when the number 1 is aligned with the

arrow, and maximum when the number 16 is aligned with

the arrow.

Before actual operation, drive a trial screw into your

material or a piece of duplicate material to determine

which torque level is required for a particular application.

ASSEMBLY

CAUTION:

• Always be sure that the tool is switched off and the

battery cartridge is removed before carrying out any

work on the tool.

Installing side grip (auxiliary handle)

(Fig. 8)

Always use the side grip to ensure operating safety.

Insert the side grip so that the protrusions on the grip base

fit in between the grooves on the tool barrel. Then tighten

the grip by turning clockwise.

Installing or removing driver bit or drill bit

(Fig. 9)

Turn the sleeve counterclockwise to open the chuck jaws.

Place the bit in the chuck as far as it will go. Turn the

sleeve clockwise to tighten the chuck.

To remove the bit, turn the sleeve counterclockwise.

Installing bit holder (Fig. 10)

Fit the bit holder into the protrusion at the tool foot on

either right or left side and secure it with a screw.

When not using the driver bit, keep it in the bit holders.

Bits 45 mm long can be kept there.

Adjustable depth rod (Fig. 11)

The adjustable depth rod is used to drill holes of uniform

depth. Loosen the clamp screw, set to desired position,

then tighten the clamp screw.

Hook (Fig. 12)

The hook is convenient for temporarily hanging the tool.

This can be installed on either side of the tool.

To install the hook, insert it into a groove in the tool

housing on either side and then secure it with a screw. To

remove, loosen the screw and then take it out.

OPERATION

Hammer drilling operation

CAUTION:

• There is a tremendous and sudden twisting force

exerted on the tool/bit at the time of hole break-

through, when the hole becomes clogged with chips

and particles, or when striking reinforcing rods

embedded in the concrete. Always use the side grip

(auxiliary handle) and firmly hold the tool by both side

grip and switch handle during operations. Failure to do

so may result in the loss of control of the tool and

potentially severe injury.

First, slide the action mode change lever so that it points

to the marking. The adjusting ring can be aligned in any

torque levels for this operation.

Be sure to use a tungsten-carbide tipped bit. Position the

bit at the desired location for the hole, then pull the switch

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

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