Maintenance - Makita GA9000 Instruction Manual

Installing or removing cut-off wheel (Fig. 4 & 5)
Mount the inner flange onto the spindle. Fit the cut-off
wheel on over the inner flange. Mount the outer flange on
the wheel and screw the lock nut with its protrusion fac-
ing downward (facing toward the wheel).
To tighten the lock nut, press the shaft lock firmly so that
the spindle cannot revolve, then use the lock nut wrench
and securely tighten clockwise.
To remove the wheel , follow the installation procedure in
reverse.
Switch action (Fig. 6)
CAUTION:
Before plugging in the tool, always check to see that the
switch trigger actuates properly and returns to
''OFF''
position when released.
To prevent the trigger from being accidentally pulled, a
lock-off button is provided. To start the tool, press in the
lock-off button and pull the trigger. Release the trigger to
stop.
Operation (Fig. 7)
CAUTION:
After operation, always switch off the tool and wait until
the wheel has come to a complete stop before putting the
tool down.
Hold the tool firmly. Turn the tool on and then apply the
wheel or disc to the workpiece.
In general, keep the edge of the wheel or disc at an angle
of about 15° – 30° to the workpiece surface.
During the break-in period with a new wheel, do not work
the grinder in the B direction or it will cut into the work-
piece. Once the edge of the wheel has been rounded off
by use, the wheel may be worked in both A and B direc-
tion.
WARNING:
• It should never be necessary to force the tool. The
weight of the tool applies adequate pressure. Forcing
and excessive pressure could cause dangerous wheel
breakage.
• Continued use of a worn-out when may result in wheel
explosion and serious personal injury. Depressed cen-
ter wheel should not be used after it has been worn
down to 115 mm (4-1/2") in diameter. Use of the wheel
after this point is unsafer and it should be removed from
service and rendered unusable by intentional destruc-
tion.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Replacement of corbon brushes (Fig. 8 & 9)
Replace carbon brushes when they are worn down to the
limit mark. Both identical carbon brushes should be
replaced at the same time.
To maintain product safety and reliability, repairs, mainte-
nance or adjustment should be carried out by a Makita
Authorized Service Center.
the
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