Section 7: Service; Troubleshooting - Grizzly G7944 Owner's Manual

SECTION 7: SERVICE

Review the troubleshooting and procedures in this section to fix or adjust your machine if a problem devel-
ops. If you need replacement parts or you are unsure of your repair skills, then feel free to call our Technical
Support at (570) 546-9663.
Motor & Electrical
Symptom Possible Cause
Machine does not 1. Switch disabling key removed or at fault.
start or a breaker
2. Incorrect power supply voltage or circuit
trips.
size.
3. Power supply circuit breaker tripped or fuse
blown.
4. Motor wires connected incorrectly.
5. Wiring open/has high resistance.
6. Start capacitor at fault.
7. Centrifugal switch at fault.
8. Motor at fault.
Machine stalls or is
1. Incorrect/dull cutter/bit for task.
underpowered.
2. Feed rate/cutting speed too fast.
3. Belt(s) slipping.
4. Machine undersized for task.
5. Motor overheated.
6. Pulley slipping on shaft.
7. Centrifugal switch at fault.
8. Motor at fault.
Machine has 1. Motor or other drive component loose.
vibration or noisy
operation.
2. V-belt(s) worn or loose.
3. Motor fan rubbing on fan cover.
4. Pulley loose.
5. Motor mount loose/broken.
6. Motor or spindle bearings at fault.
7. Chuck unbalanced or cutter dull.
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Troubleshooting

Possible Solution
1. Insert disabling key or replace.
2. Ensure correct power supply voltage and circuit
size.
3. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker or replace fuse.
4. Correct motor wiring connections (Page 40).
5. Check/fix broken, disconnected, or corroded wires.
6. Test/replace.
7. Adjust/replace centrifugal switch if available.
8. Test/repair/replace.
1. Use correct cutter/bit.
2. Decrease feed rate/cutting speed (Page 28).
3. Ensure belts are oil free, tension/replace belt(s);
ensure pulleys are aligned.
4. Perform operation with different machine.
5. Clean motor, let cool, and reduce workload.
6. Tighten loose pulley; replace broken/missing parts.
7. Adjust/replace centrifugal switch if available.
8. Test/repair/replace.
1. Inspect/replace damaged bolts/nuts, and retighten
with thread locking fluid, if necessary.
2. Inspect/replace belts with a new matched set
(Page 28).
3. Fix/replace fan cover; replace loose/damaged fan.
4. Re-align/replace shaft, pulley set screw, and key.
5. Tighten/replace.
6. Test by rotating shaft; rotational grinding/loose
shaft requires bearing replacement.
7. Replace chuck; replace/resharpen cutter.
Model G7943/G7944 (Mfd. Since 09/17)