Replacing Carbon Brushes; Lubrication - Makita HM1140C Manuel D'instruction

MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspection
or maintenance.

Replacing carbon brushes

1
When the resin insulating tip inside the carbon brush is
exposed to contact the commutator, it will automatically
shut off the motor. When this occurs, both carbon
brushes should be replaced. 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.
Remove the screws which secure the rear cover. Pry up
the rear cover with a screwdriver and remove it.
1
2
3
Use a screwdriver to remove the brush holder caps. Take
out the worn carbon brushes, insert the new ones and
secure the brush holder caps.
1
2

Lubrication

This tool requires no hourly or daily lubrication because it
has a grease-packed lubrication system. It should be
relubricated after every 6 months of operation. Send the
complete tool to Makita Authorized or Factory Service
001146
1. Commutator
2. Insulating tip
2
3. Carbon brush
3
002951
1. Screwdriver
2. Rear cover
3. Screws
002952
1. Screwdriver
2. Brush holder
cap
Center for this lubrication service. However, if circum-
stances require that you should lubricate it by yourself,
proceed as follows.
Run the tool for several minutes to warm it up. Switch off
and unplug the tool.
Remove the crank cap using a socket wrench. Rest the
tool on the table with the bit end pointing upwards. This
will allow the old grease to collect inside the crank hous-
ing.
Wipe out the old grease inside and replace with a fresh
grease (30 g; 1 oz). Use only Makita genuine hammer
grease (optional accessory). Filling with more than the
specified amount of grease (approx. 30 g; 1 oz) can
cause faulty hammering action or tool failure. Fill only
with the specified amount of grease.
1
Reinstall the crank cap and tighten with the socket
wrench.
CAUTION:
• Do not tighten the crank cap excessively. It is made
of resin and is subject to breakage.
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be per-
formed by Makita Authorized or Factory Service Centers,
always using Makita replacement parts.
6
002965
1. Socket wrench
1 2. Crank cap
2
002966
1. Hammer grease