Section 7: Service; Troubleshooting - Grizzly G0939 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. Switch disabling key removed.
start, or power
2. Machine circuit breaker tripped or at fault.
supply breaker
3. Incorrect power supply voltage or circuit
immediately trips
size.
after startup.
4. Power supply circuit breaker tripped or fuse
blown.
5. Wiring broken, disconnected, or corroded.
6. Motor brushes worn out.
7. ON/OFF or circuit breaker switch at fault.
8. Motor or motor bearings at fault.
Machine stalls or is 1. Workpiece material not suitable for
underpowered.
machine.
2. Machine undersized for task.
3. Dull knives/inserts.
4. Belt slipping; improper belt tension or oil/
grease on belts.
5. Motor brushes worn out.
6. Dust collection problem causing internal
components to clog up with shavings.
7. Pulley/sprocket slipping on shaft.
8. Motor overheated, tripping machine circuit
breaker.
9. Motor or motor bearings at fault.
Machine has 1. Motor or component loose.
vibration or noisy
operation.
2. Planer not resting evenly on stand/
workbench.
3. V-belt worn/loose, pulleys misaligned, or
belt slapping cover.
4. Knives/gibs at fault.
5. Pulley loose.
6. Cutterhead bearings at fault.
7. Motor bearings at fault.
Model G0939/G0940 (Mfd. Since 12/20)

Troubleshooting

Possible Solution
1. Install switch disabling key.
2. Reset circuit breaker on switch.
3. Ensure correct power supply voltage and circuit
size.
4. Ensure circuit is free of shorts. Reset circuit breaker
or replace fuse.
5. Fix broken wires or disconnected/corroded
connections.
6. Remove/replace brushes (Page 34).
7. Replace switch/circuit breaker.
8. Replace motor.
1. Only cut wood/ensure moisture is below 20%.
2. Use correct blades/inserts or reduce depth of cut.
3. Use sharp knives/inserts.
4. Clean/tension/replace belt (Page 36).
5. Replace motor brushes.
6. Clear blockages in dust chute/ducting. Ensure dust
collector is operating efficiently.
7. Tighten/replace loose pulley/shaft.
8. Clean motor/let cool, and reduce workload. Reset
breaker.
9. Replace motor.
1. Inspect/tighten loose bolts/nuts; replace damaged
components.
2. Shim under planer.
3. Tension/replace belt (Page 36). Re-align pulleys if
necessary.
4. Resharpen/replace knives; set knife alignment
correctly (Page 27).
5. Secure pulley on shaft.
6. Replace bearing(s).
7. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
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