Operation; Maintenance; Replacing Carbon Brushes - Makita HM0860C Instruction Manual

number settings on the adjusting dial and the blows per
minute.
Number on adjusting dial
5
4
3
2
1
006416
CAUTION:
The speed adjusting dial can be turned only as far
•
as 5 and back to 1. Do not force it past 5 or 1, or the
speed adjusting function may no longer work.
Indicator lamp
Fig.2
The green power-ON indicator lamp lights up when the
tool is plugged. 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 electric circuit or the
motor may be defective. If the indicator lamp does not
light up and the tool does not start, the ON/OFF switch or
the mains cord may be defective.
The red service indicator lamp lights up when the carbon
brushes are nearly worn out to indicate that the tool
needs servicing. After approx. 8 hours of use, the motor
will automatically be shut off.
ASSEMBLY
CAUTION:
Always be sure that the tool is switched off and
•
unplugged before carrying out any work on the tool.
For tool with side grip (auxiliary handle)
Fig.3
The side grip swings around to either side, allowing easy
handling of the tool in any position. Loosen the side grip
by turning it counterclockwise, swing it to the desired
position and then tighten it by turning clockwise.
Side handle(auxiliary handle)
Fig.4
The side handle can be swung 360° on the vertical and
secured at any desired position. It also secures at eight
different positions back and forth on the horizontal. Just
loosen the clamp nut to swing the side handle to a
desired position. Then tighten the clamp nut securely.
Bit grease (optional accessory)
Coat the bit shank head beforehand with a small amount
of bit grease (about 0.5 -1 g;.). This chuck lubrication
assures smooth action and longer service life.
Installing or removing the bit
Fig.5
Clean the bit shank and apply bit grease before installing
the bit.
Insert the bit into the tool. Turn the bit and push it in until it
-1
Blows per minute (min )
2,650
2,450
1,900
1,350
1,100
engages.
Fig.6
If the bit cannot be pushed in, remove the bit. Pull the
chuck cover down a couple of times. Then insert the bit
again. Turn the bit and push it in until it engages.
After installing, always make sure that the bit is securely
held in place by trying to pull it out.
To remove the bit, pull the chuck cover down all the way
and pull the bit out.
Fig.7
Bit angle
Fig.8
The bit can be secured at 12 different angles. To change
the bit angle, slide the change ring forward, then turn the
change ring to change the bit angle. At the desired angle,
slide the change ring back to the original position. The bit
will be secured in place.

OPERATION

CAUTION:
Always use the side grip (auxiliary handle) and
•
firmly hold the tool by both side grip and switch
handle during operations.
Chipping/Scaling/Demolition
Fig.9
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.10
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 screwdriver to remove the brush holder covers.
Fig.11
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.
6