Operation; Maintenance - Makita HR2445 Instruction Manual

Bit angle (when chipping, scaling or demolishing)
For Model HR2455 only
CAUTION:
Always be sure that the tool is switched off and
unplugged before changing the bit angle.
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. (Fig. 11)
Depress the lock button and rotate the action mode
changing knob to the g 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 uni-
form 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 opera-
tions. Attach the dust cup to the bit as shown in Fig. 14.
The size of bits which the dust cup can be attached to is
as follows.
Dust cup 5
Dust cup 9

OPERATION

Hammer drilling operation (Fig. 15)
Set the action mode changing knob to the H 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 tremendous and sudden twisting force exerted
on the tool/bit at the time of hole breakthrough, 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 con-
trol of the tool and potentially severe injury.
Bit diameter (mm)
6 – 14.5
12 – 16
Blow-out bulb (Fig. 16)
Use the blow-out bulb to clean out the hole.
Chipping/Scaling/Demolition (Fig. 17)
For Model HR2455 only
Set the action mode changing knob to the g 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.
Drilling in wood or metal (Fig. 18)
Use the optional drill chuck assembly. When installing it,
refer to "Installing or removing drill bit" described on the
previous page.
Set the action mode changing knob to "rotation only". You
can drill up to 13 mm diameter in metal and up to 32 mm
diameter in wood.
CAUTION:
• Never use "rotation with hammering" when the drill
chuck assembly is installed on the tool. The drill chuck
assembly may be damaged.
Also, the drill chuck will come off when reversing the
tool.
• 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 perfor-
mance and shorten the service life of the tool.
• There is a tremendous twisting force exerted on the
tool/bit at the time of hole breakthrough. 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.
• When performing diamond core drilling operation,
always set the change lever to the m position to use
"rotation only" action. If performing diamond core drill-
ing operation with "rotation with hammering" action, the
diamond core bit may be damaged.

MAINTENANCE

CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.
To maintain product SAFETY and RELIABILITY, repairs,
carbon brush inspection and replacement, any other
maintenance or adjustment should be performed by Mak-
ita Authorized or Factory Service Centers, always using
Makita replacement parts.
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