Section 7: Service; Troubleshooting - Grizzly G2790 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. Power supply switched OFF or at fault.
start or a breaker
2. Plug/receptacle at fault/wired wrong.
trips.
3. Start capacitor at fault.
4. Motor connection wired wrong.
5. Wall circuit breaker tripped.
6. Wiring open/has high resistance.
7. Motor ON/OFF switch at fault.
8. Motor at fault.
Machine stalls or is 1. Motor wired incorrectly.
underpowered.
2. Plug/receptacle at fault.
3. Motor bearings at fault.
4. Machine undersized for task.
5. Contactor not energized/has poor contacts.
6. Motor overheated.
7. Motor at fault.
Machine has 1. Motor or component loose.
vibration or noisy
operation.
2. Grinding wheel at fault; bore hole not
round.
3. Incorrectly mounted to workbench.
4. Motor bearings at fault.
5. Motor shaft bent.
Model G2790 (Mfd. Since 04/13)

Troubleshooting

Possible Solution
1. Ensure power supply is on/has correct voltage.
2. Test for good contacts; correct the wiring.
3. Test/replace if faulty.
4. Correct motor wiring connections (Page 32).
5. Ensure circuit size is correct/replace weak breaker.
6. Check/fix broken, disconnected, or corroded wires.
7. Replace switch.
8. Test/repair/replace.
1. Wire motor correctly (Page 32).
2. Test for good contacts/correct wiring.
3. Test/repair/replace.
4. Use new grinding wheel; reduce the depth of cut and
feed rate.
5. Test all legs for power/replace if faulty.
6. Clean motor, let cool, and reduce workload.
7. Test/repair/replace.
1. Inspect/replace damaged bolts/nuts, and re-tighten
with thread locking fluid.
2. Dress/replace grinding wheel.
3. Adjust feet, shim, or tighten mounting hardware.
4. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
5. Test with dial indicator and replace motor.
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