Section 7: Service; Troubleshooting - Grizzly G0775 Owner's Manual

SECTION 7: SERVICE

Review the troubleshooting and procedures in this section if a problem develops with your machine. If you
need replacement parts or additional help with a procedure, call our Technical Support at (570) 546-9663.
Note: Please gather the serial number and manufacture date of your machine before calling.
Motor & Electrical
Symptom Possible Cause
Machine does not 1. Incorrect power supply voltage or circuit
start or a circuit size.
breaker trips. 2. Power supply circuit breaker tripped or fuse
blown.
3. Motor wires connected incorrectly.
4. Wiring open/has high resistance.
5. ON/OFF switch at fault.
6. Start capacitor at fault.
7. Thermal overload relay has tripped.
8. Contactor not energized/has poor contacts.
9. Centrifugal switch at fault.
10. Motor at fault.
Machine stalls or is 1. Machine undersized for task.
underpowered.
2. Motor wired incorrectly.
3. Motor overheated.
4. Run capacitor at fault.
5. Contactor not energized/has poor contacts.
6. Motor at fault.
Machine has 1. Workpiece loose or incorrectly secured.
vibration or noisy 2. Table or switch pedestal mounting bolts
operation. loose.
3. Table contacting sanding disc.
4. Motor or component loose.
5. Motor fan rubbing on fan cover.
6. Motor mount loose/broken.
7. Machine incorrectly mounted.
8. Motor bearings at fault.
9. Sanding disc out of balance or loose.
10. Centrifugal switch is at fault.
Motor takes longer 1. Motor brake components at fault.
than 4 seconds to
stop sanding disc.
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Troubleshooting

Possible Solution
1. Ensure correct power supply voltage and circuit
size.
2. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker or replace fuse.
3. Correct motor wiring connections.
4. Check/fix broken, disconnected, or corroded wires.
5. Replace switch.
6. Test/replace.
7. Reset; adjust trip load dial if necessary; replace.
8. Test all legs for power/replace.
9. Adjust/replace centrifugal switch if available.
10. Test/repair/replace.
1. Clean/replace sandpaper; reduce feed rate/sanding
depth.
2. Wire motor correctly.
3. Clean motor, let cool, and reduce workload.
4. Test/repair/replace.
5. Test all legs for power/replace.
6. Test/repair/replace.
1. Use correct holding fixture and reclamp workpiece.
2. Tighten mounting bolts.
3. Adjust table gap (Page 26).
4. Inspect/replace damaged bolts/nuts, and retighten
with thread locking fluid.
5. Fix/replace fan cover; replace loose/damaged fan.
6. Tighten/replace.
7. Tighten mounting bolts; relocate/shim machine.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
9. Tighten disc hub or replace disc.
10. Replace.
1. Replace motor brake components. Call Tech
Support if you need assistance.
Model G0775 (Mfd. Since 11/14)