Section 7: Service; Troubleshooting - Grizzly G0767Z 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. Note: Please
gather the serial number and manufacture date of your machine before calling.
Motor & Electrical
Symptom Possible Cause
Machine does not 1. Emergency Stop button engaged/at fault.
start or a breaker
2. Power supply switched OFF or at fault.
trips.
3. Motor connection wired incorrectly.
4. Thermal overload relay has tripped.
5. Power supply fuse/circuit breaker is blown/
tripped.
6. Contactor not getting energized or has
burnt contacts.
7. Wiring is open/has high resistance.
8. Motor at fault.
Machine stalls or is 1. Feed rate too fast.
overloaded.
2. Motor connection wired incorrectly.
3. Machine undersized for task.
4. Motor has overheated.
5. Contactor not getting energized/has burnt
contacts.
6. Motor bearings at fault.
7. Motor at fault.
Loud repetitious 1. Motor mounting loose.
noise coming from
2. Motor fan hitting cover.
machine.
3. Abrasive belt worn/damaged/torn.
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Troubleshooting

Possible Solution
1. Rotate clockwise until it pops out/replace.
2. Ensure power supply is switched ON; ensure power
supply has correct voltage.
3. Correct motor wiring connections (Page 39).
4. Disconnect machine from power, turn amperage
dial on thermal overload relay to a higher setting
(Page 39).
5. Ensure power supply circuit size is adequate for this
machine (Page 10); replace weak breaker.
6. Test for power on all legs and contactor operation.
Replace if faulty.
7. Check for broken wires or disconnected/corroded
connection; repair/replace as necessary.
8. Test/repair/replace.
1. Reduce feed rate.
2. Correct motor wiring connections (Page 39).
3. Use new abrasive belt with appropriate grit; reduce
feed rate.
4. Clean off motor, let cool, and reduce workload.
5. Test for power on all legs and contactor operation.
Replace if faulty.
6. Test by rotating motor shaft; rotational grinding/
loose shaft requires bearing replacement.
7. Test/repair/replace.
1. Retighten motor mount fasteners.
2. Repair/replace motor fan; remove any dents in
cover.
3. Replace abrasive belt (Page 24).
Model G0767Z (Mfd. Since 11/17)