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H8148/H8149/H8150 Heavy Duty Bench Grinder
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Review the troubleshooting and procedures in this section to fix or adjust your machine if a problem devel-
ops. If you need replacement parts or you are unsure of your repair skills, then feel free to call our Technical
Support at (570) 546-9663.
SECTION 7: SERVICE
Troubleshooting
Motor & Electrical
Symptom Possible Cause Possible Solution
Motor will not start;
fuses or circuit
breakers blow.
1. Lockout key is at fault (H8148, H8149).
2. Open circuit in motor or loose connections.
3. Start capacitor is at fault.
4. Short circuit in motor or loose connections.
5. Incorrect fuses or circuit breakers in power
supply.
1. Install/replace lockout key; replace switch.
2. Inspect/repair all lead connections on motor for
loose or open connections.
3. Replace start capacitor.
4. Inspect all connections on motor for loose or shorted
terminals or worn insulation.
5. Install correct fuses or circuit breakers.
Motor overheats,
stalls (resulting
in blown fuses or
tripped circuit).
1. Motor overloaded.
2. Short circuit in motor or loose connections.
3. Depth of cut too great.
1. Reduce load on motor.
2. Inspect connections on motor for loose or shorted
terminals or worn insulation.
3. Slow down rate of movement of workpiece.
Symptom Possible Cause Possible Solution
Wavy condi-
tion on surface of
workpiece.
1. Machine vibrating.
2. Workpiece is not held in place firmly.
3. Wheel face uneven.
4. Wheel is too hard.
1. Make sure machine 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.
1. Try a wheel that is softer style or a coarser grit.
2. Slow down the rate of movement of the workpiece
into wheel.
Wheel dulls quickly,
grit falls off.
1. Depth of cut too great.
2. Wheel is too soft.
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 too soft for the material being ground, select
harder 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 too slow.
3. Bad wheel dress.
4. Wrong material is being ground.
1. Wheel too hard for the material being ground, select
softer bond.
2. Increase the rate of movement of the workpiece into
wheel.
3. Dress the wheel.
4. Grind ferrious metals only.
Grinder Operations