Makita BHR240, Instruction Manual

7

• To avoid rapid wear on the mode change mechanism, 

be sure that the action mode changing knob is always 
positively located in one of the three action mode 
positions.

Torque limiter

The torque limiter will actuate when a certain torque level 
is reached. The motor will disengage from the output 
shaft. When this happens, the bit will stop turning.

CAUTION:

• As soon as the torque limiter actuates, switch off the 

tool immediately. This will help prevent premature wear 
of the tool.

• Hole saws cannot be used with this tool. They tend to 

pinch or catch easily in the hole. This will cause the 
torque limiter to actuate too frequently.

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.

Side grip (auxiliary handle) (Fig. 7)

CAUTION:

• Always use the side grip to ensure operating safety.
Install the side grip so that the teeth on the grip fit in 
between the protrusions on the tool barrel. Then tighten 
the grip by turning clockwise at the desired position. It 
may be swung 360° so as to be secured at any position.

Bit grease

Coat the bit shank head beforehand with a small amount 
of bit grease (about 0.5 -1 g). This chuck lubrication 
assures smooth action and longer service life.

Installing or removing the bit 

Clean the bit shank and apply bit grease before installing 
the bit. 

(Fig. 8)

Insert the bit into the tool. Turn the bit and push it in until it 
engages. 

(Fig. 9)

If the bit cannot be pushed in, remove the bit. Pull the 
chuck cover down a couple of times. Then insert the bit 
again. Turn the bit and push it in until it engages.
After installing, always make sure that the bit is securely 
held in place by trying to pull it out.
To remove the bit, pull the chuck cover down all the way 
and pull the bit out. 

(Fig. 10)

Bit angle (when chipping, scaling or 
demolishing) (Fig. 11)

The bit can be secured at the desired angle. To change 
the bit angle, depress the lock button and rotate the action 
mode changing knob to the 

O

 symbol.

Turn the bit to the desired angle.
Depress the lock button and rotate the action mode 
changing knob to the   symbol. Then make sure that the 
bit is securely held in place by turning it slightly. 

(Fig. 12)

Depth gauge (Fig. 13)

The depth gauge is convenient for drilling holes of uniform 
depth. Loosen the side grip and insert the depth gauge 

into the hole in the side grip. Adjust the depth gauge to the 
desired depth and tighten the side grip.

NOTE:

• The depth gauge cannot be used at the position where 

the depth gauge strikes against the gear housing.

Dust cup (Fig. 14)

Use the dust cup to prevent dust from falling over the tool 
and on yourself when performing overhead drilling 
operations. Attach the dust cup to the bit as shown in the 
figure. The size of bits which the dust cup can be attached 
to is as follows.

OPERATION

Hammer drilling operation (Fig. 15)

Set the action mode changing knob to the 

 symbol.

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.

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.

NOTE:

Eccentricity in the bit rotation may occur while operating 
the tool with no load.
The tool automatically centers itself during operation. This 
does not affect the drilling precision.

Blow-out bulb (optional accessory)  
(Fig. 16)

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

Chipping/Scaling/Demolition (Fig. 17)

Set the action mode changing knob to the   symbol.
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.

Bit diameter

Dust cup 5

6 mm - 14.5 mm

Dust cup 9

12 mm - 16 mm