Manual Makita BHP448 (page 8 of 16) (English, Dutch)

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Installing or removing driver bit or drill bit

(Fig. 11)

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. 12)

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. 13)

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. 14)

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 (Fig. 15)

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

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

repeating this several times, the hole will be cleaned out

and normal drilling may be resumed.

Blow-out bulb (optional accessory)

(Fig. 16)

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

dust out of the hole.

Screwdriving operation

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

NOTE:

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

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

• When driving wood screw, predrill a pilot hole 2/3 the

diameter of the screw. It makes driving easier and

prevents splitting of the workpiece.

• If the tool is operated continuously until the battery

cartridge has discharged, allow the tool to rest for

15 minutes before proceeding with a fresh battery.

Drilling operation

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.

• There is a tremendous force exerted on the tool/bit at

the time of hole break through. Hold the tool firmly and

exert care when the bit begins to break through the

workpiece.

• A stuck bit can be removed simply by setting the

reversing switch to reverse rotation in order to back

out. However, the tool may back out abruptly if you do

not hold it firmly.

• Always secure small workpieces in a vise or similar

hold-down device.

• If the tool is operated continuously until the battery

cartridge has discharged, allow the tool to rest for

15 minutes before proceeding with a fresh battery.

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. Then proceed as follows.

Drilling in wood

When drilling in wood, the 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 center-punch and hammer 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

exceptions are iron and brass which should be drilled dry.

MAINTENANCE

CAUTION:

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

battery cartridge is removed before attempting to

perform inspection or maintenance.

• Never use gasoline, benzine, thinner, alcohol or the

like. Discoloration, deformation or cracks may result.

Replacing carbon brushes (Fig. 17)

Replace when they wear down to the limit mark. Keep the

carbon brushes clean and free to slip in the holders. Both

carbon brushes should be replaced at the same time. Use

only identical carbon brushes.

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Makita BHP448 Manual

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