Hammer drilling operation
Position the bit at the location for the hole, then pull
the 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 from the hole. By repeating this
several times, the hole will be cleaned out.
CAUTION:
When the bit begins to break through concrete or if
the bit strikes reinforcing rods embedded in concrete,
the tool may react dangerously. Maintain good bal-
ance and safe footing while holding the tool firmly with
both hands to prevent dangerous reaction.
Chipping / Scaling / Demolition
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.
Core bit (optional accessory)
When using the center bit
Screw the core bit on the adapter. Install the adapter
with the core bit in the tool in the same manner as a
drill bit. (Fig. 8)
Install the center bit. (Fig. 9)
Rest the core bit on the concrete and turn the tool on.
Once the core bit has cut a shallow groove into the
concrete, remove the center bit. Then resume drilling.
To remove the core bit, follow the procedures (1)
or (2).
(1) Rotate the change lever to the position. Then
rest the core bit on the concrete and turn the tool
on. The core bit will come loose from the hammer-
ing action. (Fig. 10)
(2) Hold the adapter with the wrench, insert the rod
(optional accessory) into the hole in the core bit
and tap with a hammer to unscrew. (Fig. 11)
When not using the center bit
Screw the core bit on the adapter. Install the adapter
with the core bit in the tool in the same manner as a
drill bit. (Fig. 8)
Rotate the change lever to the position. Rest the
core bit on the concrete and turn the tool on. Once the
core bit has cut a shallow groove into the concrete,
rotate the change lever to the position and resume
drilling.
NOTE:
No problem is caused even if the core bit unscrews
slightly during brief use since the core bit rotates in
the tightening direction.
To remove the core bit, follow the same removal
procedures covered in When using the center bit.
MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Replacement of carbon brushes (Fig. 12 & 13)
Whenever carbon brushes must be replaced, they cut
out the tool automatically. When this occurs, replace
both carbon brushes at the same time. Use only
identical carbon brushes.
Lubrication (Fig. 14 & 15)
This tool requires no hourly or daily lubrication
because it has a grease-packed lubrication system.
Lubricate the tool every time the carbon brushes are
replaced.
Run the tool for several minutes to warm it up. Switch
off and unplug the tool. Remove the crank cap using
a Makita lock nut wrench 35 (optional accessory).
Rest the tool on the table with the bit end pointing
upwards. This will allow the old grease to collect
inside the crank housing. Wipe out the old grease
inside and replace with a fresh grease (60 g). Use
only Makita genuine grease (optional accessory).
Filling with more than the specified amount of grease
(approx. 60 g) can cause faulty hammering action or
tool failure. Fill only with the specified amount of
grease. Reinstall the crank cap and tighten with the
lock nut wrench. Do not tighten the crank cap exces-
sively. It is made of resin and is subject to breakage.
To maintain product safety and reliability, repairs,
maintenance or adjustment should be carried out by a
Makita Authorized Service Center.
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