Makita BHP444 Manuel D'instructions page 7

slide the lever so that it points toward the
tool body. For rotation with clutch, slide the lever so that
the it points toward the
NOTE:
• When changing the position from "
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
and steel band 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.
mark on the
mark on the tool body.
" to " ", it may
To remove, loosen the screw and then take it out.
OPERATION
Hammer drilling operation (FIg. 13)
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. 14)
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 screws, predrill pilot holes to make
driving easier and to prevent splitting of the workpiece.
See the chart.
Nominal diameter of wood
screw (mm)
3.1
3.5
3.8
4.5
4.8
5.1
5.5
5.8
6.1
Recommended size of pilot
hole (mm)
2.0 - 2.2
2.2 - 2.5
2.5 - 2.8
2.9 - 3.2
3.1 - 3.4
3.3 - 3.6
3.6 - 3.9
4.0 - 4.2
4.2 - 4.4
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