Section 7: Service; Troubleshooting - Grizzly T27400 Owner's Manual

SECTION 7: SERVICE

Review the troubleshooting and procedures in this section to fix or adjust your machine if a problem devel-
ops. 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
Machine does not 1. Power supply switched OFF or at fault.
start or a breaker
2. Wall circuit breaker tripped.
trips.
3. Plug/receptacle at fault/wired wrong.
4. Motor connection wired wrong.
5. Wiring open/has high resistance.
6. Motor ON/OFF switch at fault.
7. Motor at fault.
Machine stalls or is 1. Feed rate/lathe speed too fast.
underpowered.
2. Belt slipping.
3. Motor overheated.
4. Motor wired incorrectly.
5. Plug/receptacle at fault.
6. Pulley slipping on shaft/spindle.
7. Motor bearings at fault.
8. Machine undersized for task.
9. Motor at fault.
Machine has 1. Grinder incorrectly mounted to lathe.
vibration or noisy
2. Motor or component loose.
operation.
3. External wheel contacting guard.
4. Belt worn or loose.
5. Grinding wheel arbor hole not round.
6. Pulley loose.
7. Motor mount loose/broken.
8. Motor bearings at fault.
9. Motor shaft bent.
Model T27400 (Mfd. Since 02/15)

Troubleshooting

Possible Solution
1. Ensure power supply is ON/has correct voltage.
2. Ensure circuit size is correct/replace weak breaker.
3. Test for good contacts; correct the wiring.
4. Correct motor wiring connections (Page 30).
5. Check/fix broken, disconnected, or corroded wires.
6. Replace switch.
7. Test/repair/replace.
1. Decrease feed rate/lathe speed.
2. Tension/replace belt; ensure pulleys are aligned.
3. Clean motor, let cool, and reduce workload.
4. Wire motor correctly (Page 30).
5. Test for good contacts/correct wiring.
6. Replace loose pulley/shaft/spindle.
7. Test/repair/replace.
8. Use new grinding wheel; reduce the feed rate.
9. Test/repair/replace.
1. Use bushing(s); re-tighten tool post nut.
2. Inspect/replace damaged bolts/nuts, and re-tighten
with thread locking fluid.
3. Properly align spindle pulley with motor pulley; make
sure external wheel does not contact guard.
4. Inspect/replace belt.
5. Dress/replace grinding wheel.
6. Realign/replace shaft, pulley, setscrew, and key.
7. Tighten/replace.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
9. Test with dial indicator and replace motor.
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