Operation; Maintenance; Replacing Carbon Brushes - Makita HM1801 Instruction Manual

Installing or removing the bit
002928
This tool accepts bits either with or without a collar on its
shank.
To install the bit, follow either procedure (1) or (2)
described below.
(1) For bits with a collar
1
2
3
4
006202
Pivot the tool retainer back and slightly downward.
Insert the bit into the tool holder as far as it will go.
To securely retain the bit, return the tool retainer to
its original position.
CAUTION:
Always assure that the bit is securely retained by
•
attempting to pull the bit out of the tool holder after
completing the above procedure.
(2) For bits without a collar
1
2
4
3
006201
Pivot the tool retainer front and slightly downward.
With the notched portion of the bit facing the tool
retainer shaft, insert the bit into the tool holder as
far as it will go. Then pivot the tool retainer further
downward toward the barrel to securely retain the
bit.
1. Bit with collar
1
2. Bit without collar
2
1. Bit
Fig.1
2. Tool retainer
3. Tool holder
4. When the bit is
inserted
5. When the bit is
retained
5
1. Notched portion
Fig.2
2. Tool retainer
shaft
3. Barrel
4. When the bit is
inserted
5. When the bit is
retained
5
CAUTION:
Always assure that the bit is securely retained by
•
attempting to pull the bit out of the tool holder after
completing the above procedure.
The bit without a collar cannot be retained by the
•
method shown in Fig.(1).
To remove the bit, follow the installation procedure in
reverse.

OPERATION

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.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and
•
unplugged before attempting to perform inspection
or maintenance.
Never use gasoline, benzine, thinner, alcohol or the
•
like. Discoloration, deformation or cracks may
result.

Replacing carbon brushes

1
001146
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.
Use a hex wrench to remove the motor housing cover.
1
006203
6
1. Commutator
2. Insulating tip
2
3. Carbon brush
3
1. Hex wrench 5
2
2. Motor housing
cover