Section 7: Service; Troubleshooting - Grizzly T32720 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. Motor brushes worn out.
6. ON/OFF switch at fault.
7. Variable-speed dial/potentiometer at fault.
8. Blown fuse on circuit board or circuit board at
fault.
9. Motor or motor bearings at fault.
Machine 1. Operator using too much pressure.
stalls or is
2. Wrong workpiece material.
underpowered.
3. Blown fuse on circuit board or circuit board at
fault.
4. Variable-speed dial/potentiometer at fault.
5. Motor brushes worn out.
6. Machine undersized for task.
7. Motor overheated.
8. Extension cord too long.
9. Motor or motor bearings at fault.
Machine has 1. Machine not placed on flat surface.
vibration or
2. Grinding wheel dressed incorrectly.
noisy operation.
3. Grinding wheel is water-logged.
4. Motor or component loose.
5. Grinding wheel at fault/arbor hole not round.
6. Motor mount loose/broken.
7. Workpiece loose.
8. Motor shaft bent.
9. Motor bearings at fault.
Model T32720 (Mfd. Since 06/21)

Troubleshooting

Possible Solution
1. Install switch disabling key.
2. Ensure correct power supply voltage and circuit size
(Page 10).
3. Ensure circuit is free of shorts. Reset circuit breaker or
replace fuse.
4. Fix broken wires or disconnected/corroded
connections.
5. Replace brushes (Page 31).
6. Replace switch.
7. Replace.
8. Inspect/replace circuit board if at fault.
9. Replace motor.
1. Use less pressure when grinding or stropping.
2. Use correct type/size of material (Page 17).
3. Inspect/replace circuit board if at fault.
4. Test/replace dial/potentiometer.
5. Replace brushes (Page 31).
6. Use new grinding wheel; reduce workpiece pressure.
7. Clean motor, let cool, and reduce workload.
8. Move machine closer to power supply; use shorter
extension cord.
9. Replace motor.
1. Make sure machine is placed on a solid, flat surface.
2. Re-dress wheel (Page 28).
3. Allow wheel to dry, then inspect wheel (Page 19) Do
not leave wheel immersed in water when not in use.
Replace wheel if needed (Page 22).
4. Replace damaged or missing bolts/nuts or tighten if
loose.
5. Dress (Page 28)/replace (Page 22) grinding wheel.
6. Tighten/replace.
7. Use the correct holding fixture and reclamp the
workpiece.
8. Test with dial indicator and replace motor.
9. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
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