Manual Makita bhp 450 rfx (page 6 of 18) (English, Dutch)

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CAUTION:

• Always check the direction of rotation before operation.

• 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)

• To change the speed, first switch off the tool and then

slide the speed change lever to the “2” side for high

speed or “1” side for low speed. Be sure that the speed

change lever is set to the correct position before opera-

tion. Use the right speed for your job.

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” side and “2”

side, 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 changing ring. Select

one of the three modes suitable for your work needs by

using this ring.

For rotation only, turn the ring so that the arrow on the tool

body points toward the mark on the ring.

For rotation with hammering, turn the ring so that the

arrow points toward the mark on the ring.

For rotation with clutch, turn the ring so that the arrow

points toward the mark on the ring.

CAUTION:

• Always set the ring correctly to your desired mode

mark. If you operate the tool with the ring 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 turn-

ing 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 mate-

rial 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 bat-

tery cartridge is removed before carrying out any work

on the tool.

Installing or removing driver bit or drill bit

(Fig. 8)

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.

Hook (Fig. 9)

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 hous-

ing 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 embed-

ded in the concrete.

First, turn the action mode changing ring so that the arrow

on the tool body 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

idle, then remove the bit partially from the hole. By repeat-

ing this several times, the hole will be cleaned out and

normal drilling may be resumed.

Blow-out bulb (optional accessory)

(Fig. 10)

After drilling the hole, use the blow-out bulb to clean the

dust out of the hole.

Screwdriving operation (Fig. 11)

First, turn the action mode changing ring so that the arrow

on the tool body points to the marking. Adjust the

adjusting ring to the proper torque level for your work.

Then proceed as follows.

Place the point of the driver bit in the screw head and

apply pressure to the tool. Start the tool slowly and then

increase the speed gradually. Release the switch trigger

as soon as the clutch cuts in.

CAUTION:

• Make sure that the driver bit is inserted straight in the

screw head, or the screw and/or bit may be damaged.

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Makita bhp 450 rfx Manual

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