Section 7: Service; Troubleshooting - Grizzly G8689Z 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 1. Emergency Stop button cover depressed/at
not start, or
fault.
power supply
2. Spindle power needs to be reset.
breaker
immediately
3. Blown machine fuse.
trips after
4. Incorrect power supply voltage or circuit size.
startup.
5. Spindle speed dial or potentiometer at fault.
6. Power supply circuit breaker or fuse blown.
7. Wiring broken, disconnected, or corroded.
8. Motor brushes worn out.
9. ON/OFF toggle switch at fault.
10. Circuit board at fault.
11. Motor or motor bearings at fault.
Machine 1. Wrong workpiece material.
stalls or is
2. Machine undersized for task.
underpowered.
3. Extension cord too long.
4. Motor overheated.
5. Motor brushes worn out.
6. Gear drive at fault.
7. Circuit board at fault.
8. Spindle speed potentiometer at fault.
9. Motor or motor bearings at fault.
Machine has 1. Motor or component loose.
vibration or
noisy operation.
2. Incorrectly mounted to workbench.
3. Spindle loose, improperly installed, or
damaged.
4. Gear drive at fault.
5. Spindle bearings at fault.
6. Motor bearings at fault.
Model G8689Z (Mfd. Since 07/23)

Troubleshooting

Possible Solution
1. Remove Emergency Stop button cover to reset.
Replace if at fault.
2. Turn spindle speed dial all the counterclockwise to
reset (Page 4).
3. Replace fuse (Page 36)/ensure no shorts.
4. Ensure correct power supply voltage and circuit size
(Page 11).
5. Test/replace if at fault.
6. Ensure circuit is free of shorts. Reset circuit breaker or
replace fuse.
7. Fix broken wires or disconnected/corroded
connections (Page 39).
8. Replace motor brushes (Page 36).
9. Replace switch.
10. Inspect/replace if at fault.
11. Replace motor.
1. Use correct size/type of material (Page 6).
2. Use correct cutter/bit; reduce feed rate; reduce spindle
RPM (Page 27); use cutting fluid if possible.
3. Move machine closer to power supply; use shorter
extension cord (Page 12).
4. Clean motor, let cool, and reduce workload. Clear
cooling fan outlet if obstructed.
5. Replace motor brushes (Page 36).
6. Replace broken or slipping gears.
7. Inspect and replace if at fault.
8. Test and replace if at fault.
9. Replace motor.
1. Replace damaged or missing bolts/nuts or tighten if
loose.
2. Tighten mounting hardware or shim.
3. Tighten loose spindle, re-install spindle ensuring
mating surfaces are clean, replace spindle if damaged.
4. Replace broken or slipping gears.
5. Test by rotating spindle; rotational grinding/loose shaft
requires bearing replacement.
6. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
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