Functional Description; Operation; Maintenance - Makita HM1801 Instruction Manual

12. Do not point the tool at any one in the area when
operating. The bit could fly out and injure
someone seriously.
13. Do not touch the bit or parts close to the bit
immediately after operation; they may be
extremely hot and could burn your skin.
14. Do not operate the tool at no-load unnecessarily.
15. Some material contains chemicals which may be
toxic. Take caution to prevent dust inhalation and
skin contact. Follow material supplier safety data.
SAVE THESE INSTRUCTIONS.
WARNING:
DO NOT let comfort or familiarity with product (gained
from repeated use) replace strict adherence to safety
rules for the subject product.
MISUSE or failure to follow the safety rules stated in
this instruction manual may cause serious personal
injury.

FUNCTIONAL DESCRIPTION

CAUTION:
• Always be sure that the tool is switched off and
unplugged before adjusting or checking function on the
tool.
Switch action (Fig. 1)
CAUTION:
• Before plugging in the tool, always check to see that
the switch lever actuates properly and returns to the
"OFF" position when released.
To start the tool, simply squeeze the switch lever. Release
the switch lever to stop.
Indicator lamp (Fig. 2)
The green power-ON indicator lamp lights up when the
tool is plugged to the mains. If the indicator lamp is lit but
the tool does not start even if the tool is switched ON, the
carbon brushes may be worn out, or the motor or the
switch may be defective. If the indicator lamp does not
light up, the mains cord or the indicator lamp may be
defective.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Installing or removing the bit (Fig. 3)
This tool accepts bits either with or without a collar on its
shank.
To install the bit, follow either procedure (3) or (4)
described below.
(1) For bits with a collar (Fig. 4)
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 (Fig. 5)
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.
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. 4.
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 (Fig. 6)
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.
(Fig. 7)
Remove the cap rubber. (Fig. 8)
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. (Fig. 9)
Lubrication (Fig. 10 - 12)
This tool requires no hourly or daily lubrication because it
has a greasepacked lubrication system. It should be relu-
bricated after every 6 months of operation. Send the com-
plete tool to Makita Authorized or Factory Service Center
for this lubrication service. However, if circumstances
require that you should lubricate it by yourself, proceed as
follows.
5