Table of Contents
Advertisement
SECTION 5: SERVICE
Review the troubleshooting and procedures in this section to fix your machine if a problem develops. 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.
Motor & Electrical
Symptom
Possible Cause
Motor will not start.
1.
Low voltage.
2.
Open circuit in motor or loose connections.
Motor will not start;
1.
Short circuit in line cord or plug.
fuses
or
circuit
breakers blow.
2.
Short circuit in motor or loose connections.
3.
Incorrect fuses or circuit breakers in power line.
Motor overheats.
1.
Motor overloaded.
Motor stalls (result-
1.
Short circuit in motor or loose connections.
ing in blown fuses
or tripped circuit).
2.
Low voltage.
3.
Incorrect fuses or circuit breakers in power line.
4.
Motor overloaded.
Machine
slows
1.
Operator is using too much pressure.
when operating.
Wavy
condi-
1.
Machine vibrating.
tion on surface of
workpiece.
2.
Workpiece not being held firmly.
3.
Wheel face uneven.
4.
Wheel is too hard.
Lines on surface of
1.
Impurity on wheel surface.
workpiece.
2.
Workpiece not being held tightly.
Burning
spots
1.
Improper type of grinding wheel.
or cracks in the
2.
Improper feed rate.
workpiece.
3.
Coolant required.
Wheel dulls quickly,
1.
Depth of cut too great.
grit falls off.
2.
Wheel is too soft.
3.
Wheel diameter too small.
4.
Bad wheel dress.
5.
Defective wheel bonding.
Wheel clogs and
1.
Wheel is too hard.
workpiece
shows
burn marks.
2.
Feed rate too slow.
3.
Bad wheel dress.
4.
Coolant required.
H7758/H7759 8" & 10" Bench Grinders
Troubleshooting
Possible Solution
1.
Check power line for proper voltage.
2.
Inspect all lead connections on motor for loose or open
connections.
1.
Inspect cord or 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.
1.
Reduce load on motor.
1.
Inspect connections on motor for loose or shorted termi-
nals or worn insulation.
2
Correct the low voltage conditions.
3.
Install correct fuses or circuit breakers.
4.
Reduce load on motor.
1.
Use less pressure when grinding.
1.
Make sure machine is securely mounted on a solid sur-
face.
2.
Use a holding device to firmly retain the workpiece.
3.
Dress the grinding wheel.
4.
Use softer wheel, or reduce the feed rate.
1.
Dress the grinding wheel.
2.
Use a holding device to firmly retain the workpiece.
1.
Try a wheel which is softer style or a coarser grit.
2.
Slow down the rate of movement of the workpiece into
wheel.
3.
Add optional coolant system or introduce coolant by
hand.
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.
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.
Add optional coolant system or introduce coolant by
hand.
-17-
Advertisement
Table of Contents
