Section 7: Service; Troubleshooting - Grizzly G0844 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 not 1. Spindle direction switch in neutral position.
start, or power-
2. OFF button not pressed before toggling
supply fuse/breaker
spindle direction switch.
trips immediately
3. Motor brushes worn or at fault.
after startup.
4. Blown fuse.
5. Power supply circuit breaker tripped or fuse
blown.
6. Motor wires connected incorrectly.
7. Wiring open/has high resistance.
8. ON/OFF switch at fault.
9. Circuit board at fault.
10. Variable-speed potentiometer at fault.
11. Motor at fault.
Machine stalls or is 1. Machine undersized for task.
underpowered.
2. Workpiece material not suitable for
machine.
3. Feed rate/cutting speed too fast.
4. Variable-speed potentiometer at fault.
5. Belt slipping.
6. Motor brushes worn or at fault.
7. Circuit board at fault.
8. Pulley slipping on shaft.
9. Motor at fault.
Machine has 1. Motor or component loose.
vibration or noisy
operation.
2. Machine sits unevenly on workbench.
3. V-belt worn, loose, or misaligned.
4. Pulley loose.
5. Motor fan rubbing on fan cover.
6. Workpiece/faceplate at fault.
7. Motor mount loose/broken.
8. Motor bearings at fault.
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Troubleshooting

Possible Solution
1. Toggle switch to forward/reverse.
2. Press OFF button before toggling spindle direction
switch.
3. Remove/replace brushes (Page 36).
4. Replace fuse/ensure no shorts.
5. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker or replace fuse.
6. Correct motor wiring connections (Page 39).
7. Check/fix broken, disconnected, or corroded wires.
8. Replace switch/circuit breaker.
9. Inspect/replace if at fault.
10. Test/replace if at fault.
11. Test/repair/replace.
1. Use sharp chisels; reduce feed rate/depth of cut.
2. Only cut wood/ensure moisture is below 20%.
3. Decrease feed rate/cutting speed (Page 23).
4. Test/replace if at fault.
5. Tension/replace belt; ensure pulleys are aligned
(Page 35); belts are clean and not damaged.
6. Remove/replace brushes (Page 36).
7. Inspect/replace if at fault.
8. Tighten/replace loose pulley/shaft.
9. Test/repair/replace.
1. Inspect/replace damaged bolts/nuts, and retighten
with thread-locking fluid.
2. Adjust feet.
3. Inspect/replace belt (Page 34). Re-align pulleys if
necessary (Page 35).
4. Re-align/replace shaft, pulley, set screw, and key.
5. Fix/replace fan cover; replace loose/damaged fan.
6. Center workpiece in chuck/faceplate; reduce RPM;
replace defective chuck.
7. Tighten/replace.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
Model G0844 (Mfd. Since 2/18)