Maintenance; Replacing Carbon Brushes - Makita HR4000C Instruction Manual

1. Blow-out bulb

MAINTENANCE

1
1. Commutator
2. Insulating tip
3. Carbon brush
1. Screwdriver
2. Brush holder cover
Blow-out bulb (optional accessory)
002449
After drilling the hole, use the blow-out bulb to clean the dust
out of the hole.
1
Chipping/Scaling/Demolition
003206
Set the change lever to the
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.
CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.

Replacing carbon brushes

001146
When the resin insulating tip inside the carbon brush is
2
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
3
the same time. Use only identical carbon brushes.
Use a screwdriver to remove the brush holder cover.
003226
1
2
symbol.
11