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Makita GB801 Manual

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This section covers the most common problems encountered during operation and what to do about them. Do not make
any adjustments until machine is unplugged and moving parts have come to a complete stop.
TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
Motor will not start. 1. Low voltage.
2. Open circuit in motor or loose
connections.
1. Check power line for proper voltage.
2. Inspect all lead connections on motor
for loose or open connections.
Motor will not start; fuses or
circuit breakers blow
1. Short circuit inline cord or plug.
2. Short circuit in motor or loose
connections.
1. Inspect cord plug for damaged
insulation and shorted wires.
2. Inspect all connections on motor for
loose or shorted terminals or worn
insulation.
3. Install correct fuses or circuit breakers.
Motor overheats. Motor overloaded. Reduce load on motor.
Motor stalls (resulting in blown
fuses or tripped circuit)
1. Short circuit in motor or loose
connections.
2. Low voltage.
3. Incorrect fuses or circuit breakers in
power line.
4. Motor overloaded.
1. Inspect connections on motor for loose
or shorted terminals or worn insulation.
2. Correct the low voltage conditions.
3. Install correct fuses or circuit breakers.
4. Reduce load on motor.
Machine slows when
operating.
Depth of cut is too great. Slow down the of rate of movement of the
workpiece into wheel.
Wavy condition on surface of
workpiece.
1. Make sure machines is securely
mounted on a solid surface.
2. Use a holding device to firmly retain
the workpiece.
3. Dress the grinding wheel.
4. Use softer wheel, or reduce the feed
rate.
Lines on surface of workpiece. 1. Impurity on wheel surface.
2. Workpiece not being held tightly.
1. Dress the grinding wheel.
2. Use a holding device to firmly retain
the workpiece.
Burning spots or cracks in the
workpiece.
1. Improper type of grinding wheel.
2. Improper feed rate.
3. Coolant required.
1. Try a wheel which is softer style or
coarser grit.
2. Slow down the rate of movement of the
workpiece into wheel.
3. Add optional coolant system or
introduce coolant by hand.
Wheel dulls quickly, grit falls
off.
1. Depth of cut too great.
2. Wheel is too soft for the material being.
Select harder bond.
3. Wheel diameter too small.
4. Bad wheel dress.
5. Defective wheel bonding.
1. Slow down the rate of movement of the
workpiece into wheel.
2. Wheel is too hard for the material
being. Select softer bond.
3. Replace the wheel.
4. Dress the wheel.
5. Consult manufacturer of grinding
wheel.
Wheel clogs and workpiece
shows burn marks.
1. Wheel is too hard.
2. Feed rate is too slow.
3. Bad wheel dress.
4. Coolant required.
1. Select softer bond.
2. Increase the rate of movement of the
workpiece into wheel.
3. Dress the wheel.
4. Add optional coolant system or
introduce coolant by hand.
… 9 …


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