Section 7: Service; Troubleshooting - Grizzly G9972Z Owner's Manual

SECTION 7: SERVICE

Review the troubleshooting 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. Plug or receptacle is at fault or wired
start or a breaker
incorrectly.
trips.
2. Start capacitor is at fault.
3. Wall fuse or circuit breaker is blown or
tripped.
4. Motor connection is wired incorrectly.
5. Power supply is at fault, or is switched
OFF.
6. Motor ON/OFF button is at fault.
7. Centrifugal switch is at fault.
8. Spindle switch is at fault.
9. Cable or wiring is open or has high
resistance.
10. Motor is at fault.
Machine has 1. Motor or component is loose.
vibration or noisy
operation.
2. V-belt worn, damaged, or loose.
3. Motor fan is rubbing on fan cover.
4. Pulley set screws or keys are missing or
loose.
5. Machine is incorrectly mounted.
6. Cutting tool is chattering.
7. Workpiece or chuck is at fault.
8. Spindle bearings are at fault.
9. Motor bearings are at fault.
10. Gears are at fault.
Model G9972Z (Mfd. Since 03/20)

Troubleshooting

Possible Solution
1. Test power plug and receptacle for good contact and
correct wiring.
2. Test capacitor and replace if necessary.
3. Make sure circuit breaker/fuse is sized correctly for
machine load; replace faulty breaker.
4. Correct motor wiring (Page 65).
5. Make sure all hot lines and grounds are operational
and have correct voltage.
6. Replace faulty motor ON/OFF button.
7. Adjust/replace.
8. Test; replace if necessary.
9. Troubleshoot wires for internal/external breaks;
check for disconnected or corroded connections;
repair or replace faulty wiring or connections.
10. Test/repair/replace.
1. Inspect/replace stripped or damaged fasteners;
re-tighten with thread locking fluid.
2. Replace/re-tension V-belt (Page 40).
3. Repair/replace dented fan cover or fan.
4. Inspect set screws/keys;
necessary.
5. Re-tighten/replace machine mounting hardware as
necessary; use shims where required.
6. Re-sharpen/replace cutting tool; index tool to
workpiece; use correct feed rate and spindle speed.
7. Re-center and properly secure workpiece in chuck or
faceplate; replace defective chuck/faceplate.
8. Tighten/replace spindle bearings (Page 61).
9. Rotate motor shaft to check for noisy or burnt
bearing; repair/replace as necessary.
10. Replace bad gears/bearings.
replace/tighten if
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