Section 7: Service; Troubleshooting - Grizzly G0808 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. Master Power Switch in OFF position.
start or quickly shuts
down after startup.
2. Emergency Stop button depressed/at fault.
3. Power supply circuit breaker tripped or fuse
blown.
4. Incorrect power supply voltage or circuit
size.
5. Motor wires connected incorrectly.
6. Wiring open/has high resistance.
7. ON/OFF switch at fault.
8. Spindle rotation switch at fault.
9. Variable-Speed potentiometer at fault.
10. Inverter/control box at fault.
11. Motor at fault.
Machine stalls or is 1. Machine undersized for task.
underpowered.
2. Wrong workpiece material.
3. Motor overheated.
4. Motor wires connected incorrectly.
5. Gearbox at fault.
6. Variable-Speed potentiometer at fault.
7. Inverter/control box at fault.
8. Motor bearings at fault.
Machine has 1. Workpiece loose.
vibration or noisy
2. Chuck or cutter at fault.
operation.
3. Motor or component loose.
4. Motor fan rubbing on fan cover.
5. Motor mount loose/broken.
6. Machine incorrectly mounted to floor.
7. Spindle bearings at fault.
8. Motor bearings at fault.
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Troubleshooting

Possible Solution
1. Remove lock (if applicable) and rotate switch to ON
position (Page 50).
2. Rotate button head to reset. Replace.
3. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker or replace fuse.
4. Ensure correct power supply voltage and circuit
size, according to specified circuit requirements.
5. Correct motor wiring connections (Page 50).
6. Check/fix broken, disconnected, or corroded wires.
7. Replace switch.
8. Test/replace switch.
9. Test/replace potentiometer.
10. Inspect inverter/controller box; replace.
11. Test/repair/replace motor.
1. Use correct cutter/bit; reduce feed rate or cutting
speed; use cutting fluid if necessary.
2. Use proper material type for machine.
3. Clean motor, let cool, and reduce workload.
4. Correct motor wiring connections (Page 50).
5. Select appropriate speed range; replace broken or
slipping gears.
6. Test/replace potentiometer.
7. Inspect inverter/controller box; replace.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
1. Use the correct holding fixture/reclamp workpiece.
2. Replace unbalanced chuck; replace/resharpen
cutter; use correct feed rate.
3. Inspect/replace damaged bolts/nuts, and retighten
with thread locking fluid.
4. Fix/replace fan cover; replace loose/damaged fan.
5. Tighten/replace motor mount.
6. Tighten mounting bolts; relocate/shim machine.
7. Test by rotating spindle; rotational grinding/loose
shaft requires bearing replacement.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
Model G0808 (Mfd. Since 11/15)