Section 7: Service; Troubleshooting; Motor & Electrical - Grizzly G0726 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 at (570) 546-9663.
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 is pushed in or is
start or a breaker
at fault.
trips.
2. Plug/receptacle is at fault or wired
incorrectly.
3. Power supply is switched OFF or is at
fault.
4. Motor connection wired incorrectly.
5. ON button is at fault.
6. Motor windings or motor is at fault.
Machine stalls or is 1. Machine is undersized for the task.
overloaded.
2. Workpiece alignment is poor.
3. Dull or incorrect cutting tool.
4. Gearbox is at fault.
5. Motor connection is wired incorrectly.
6. Plug/receptacle is at fault.
7. Pulley/sprocket slipping on shaft.
8. Motor bearings are at fault.
9. Motor has overheated.
10. Motor is at fault.
Machine has 1. Tool holder or cutter is at fault.
vibration or noisy
operation.
2. Workpiece alignment is poor.
3. Motor or component is loose.
4. Pulley is loose.
5. Machine is incorrectly mounted or sits
unevenly.
6. Motor fan is rubbing on fan cover.
7. Motor bearings are at fault.
8. Gearbox is at fault.
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Troubleshooting

Possible Solution
1. Turn the emergency STOP button clockwise until it
pops out; replace if faulty.
2. Test for good contacts; correct the wiring.
3. Ensure hot lines have correct voltage on all legs and
main power supply is switched ON.
4. Correct motor wiring connections.
5. Replace faulty ON button.
6. Replace motor.
1. Use smaller, sharper tooling; reduce the feed rate;
reduce the spindle RPM; use coolant.
2. Eliminate workpiece binding; use vise or clamps as
required for workpiece alignment control.
3. Use sharp and correct cutting tool for the operation.
4. Replace broken or slipping gears.
5. Correct motor wiring connections.
6. Test for good contacts; correct the wiring.
7. Replace loose pulley/shaft.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
9. Clean off motor, let cool, and reduce workload.
10. Test and repair or replace.
1. Replace out-of-round tool holder; replace/resharpen
cutter; use appropriate feed rate and cutting RPM.
2. Eliminate workpiece binding; use vise or clamps as
required for workpiece alignment control.
3. Inspect/replace stripped or damaged bolts/nuts, and
re-tighten with thread locking fluid.
4. Realign/replace shaft, pulley, setscrew, and key as
required.
5. Tighten/replace mounting bolts in floor; relocate/
shim machine.
6. Replace dented fan cover or fan.
7. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
8. Rebuild gearbox for bad gear(s)/bearing(s).
Model G0726 (Mfg. Since 7/11)