Section 7: Service; Troubleshooting - Grizzly T33901 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. Switch disabling key removed.
not start, or
2. Incorrect power supply voltage or circuit size.
power supply
breaker
3. Power supply circuit breaker tripped or fuse
immediately
blown.
trips after
4. Wiring broken, disconnected, or corroded.
startup.
5. ON/OFF switch at fault.
6. Motor or motor bearings at fault.
Machine 1. Workpiece material unsuitable for machine.
stalls or is
underpowered.
2. Feed rate/cutting speed too fast.
3. Belt(s) slipping/pulleys misaligned.
4. Motor wires connected incorrectly.
5. Pulley slipping on shaft.
6. Machine undersized for task.
7. Motor overheated.
8. Run capacitor at fault.
9. Extension cord too long.
10. Motor or motor bearings at fault.
Machine has 1. Motor or component loose.
vibration or
noisy operation.
2. V-belt(s) worn, loose, pulleys misaligned or
belt slapping cover.
3. Pulley loose.
4. Motor mount loose/broken.
5. Spindle loose, improperly installed or
damaged.
6. Workpiece loose.
7. Chuck or cutter at fault.
8. Motor fan rubbing on fan cover.
9. Spindle bearings at fault.
10. Motor bearings at fault.
Model T33901/T33902 (Mfd. Since 07/23)

Troubleshooting

Possible Solution
1. Install switch disabling key.
2. Ensure correct power supply voltage and circuit size
(Page 13).
3. Ensure circuit is free of shorts. Reset circuit breaker
and replace fuse.
4. Fix broken wires or disconnected/corroded
connections (Page 43).
5. Replace switch.
6. Replace motor.
1. Only cut wood with moisture below 20% and correct
type/size of metal.
2. Decrease feed rate/cutting speed (Page 28).
3. Clean/tension/replace belt(s) (Page 28); ensure
pulleys are aligned (Page 39).
4. Correct motor wiring connections (Page 43).
5. Tighten/replace loose pulley/shaft.
6. Use sharp bits/reduce feed rate/reduce spindle RPM
(Page 28).
7. Clean motor, let cool, and reduce workload.
8. Test/repair/replace.
9. Move machine closer to power supply; use shorter
extension cord (Page 14).
10. Replace motor.
1. Replace damaged or missing bolts/nuts or tighten if
loose.
2. Inspect/replace belts with a new matched set (Page
28). Realign pulleys if necessary (Page 39).
3. Secure pulley on shaft.
4. Tighten/replace.
5. Tighten loose spindle, re-install spindle ensuring
mating surfaces are clean, replace spindle if damaged.
6. Use correct holding fixture and reclamp workpiece.
7. Replace out-of-round chuck, dull, or bent cutter.
8. Fix/replace fan cover; replace loose/damaged fan.
9. Test by rotating spindle; rotational grinding/loose shaft
requires bearing replacement.
10. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
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