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G0508 10 HP Industrial Dust Collector
This section is provided for your convenience—it is not a substitute for the Grizzly Service Department. If
you need help troubleshooting, need replacement parts, or are unsure of how to perform the procedures in
this section, please call our Technical Support at (570) 546-9663.
SECTION 8: SERVICE
About Service
Troubleshooting
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
Machine does not start or
a breaker trips.
1. Plug/receptacle is at fault or wired
incorrectly.
2. Motor connection wired incorrectly.
3. Thermal overload relay has
tripped.
4. Contactor not getting energized/
has burnt contacts.
5. Power supply is at fault/switched
OFF.
6. Motor ON button or ON/OFF
switch is at fault.
7. Centrifugal Switch is at fault.
8. Wiring is open/has high
resistance.
9. Motor is at fault.
10. Start delay module is at fault.
1. Test for good contacts; correct the wiring.
2. Correct motor wiring connections.
3. Turn cut-out dial to increase working amps and
push the reset pin. Replace if tripped multiple
times (weak relay).
4. Test for power on all legs and contactor operation.
Replace unit if faulty.
5. Ensure hot lines have correct voltage on all legs
and main power supply is switched ON.
6. Replace faulty ON button or ON/OFF switch.
7. Adjust/replace the centrifugal switch if available.
8. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
9. Test/repair/replace.
10. Adjust to correct delay; replace module.
Machine stalls or is
underpowered.
1. Motor connection is wired
incorrectly.
2. Plug/receptacle is at fault.
3. Motor bearings are at fault.
4. Motor has overheated.
5. Contactor not getting energized or
has poor contacts.
6. Motor is at fault.
7. Centrifugal switch is at fault.
1. Correct motor wiring connections.
2. Test for good contacts; correct the wiring.
3. Test by rotating shaft; rotational grinding/loose
shaft requires bearing replacement.
4. Clean off motor, let cool, and reduce workload.
5. Test for power on all legs and contactor operation.
Replace if faulty.
6. Test/repair/replace.
7. Adjust/replace centrifugal switch if available.
Machine has vibration or
noisy operation.
1. Motor or component is loose.
2. Motor fan is rubbing on fan cover.
3. Cast iron motor mount loose/
broken.
4. Motor bearings are at fault.
5. Centrifugal switch.
1. Inspect/replace stripped or damaged bolts/nuts,
and re-tighten with thread locking fluid.
2. Replace dented fan cover; replace loose/damaged
fan.
3. Tighten/replace.
4. Test by rotating shaft; rotational grinding/loose
shaft requires bearing replacement.
5. Replace
Motor & Machine Operation