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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.
Symptom
Possible Cause
Machine does not
1. Plug/receptacle at fault/wired incorrectly.
start or a power-
2. Power supply circuit breaker tripped.
supply fuse/breaker
trips immediately
3. Wiring broken, disconnected, or corroded.
after startup.
4. Motor ON/OFF switch at fault.
5. Circuit board at fault.
6. Motor at fault.
Machine stalls or is
1. Operation overloading motor.
underpowered.
2. Motor overheated.
3. Motor bearings at fault.
4. Motor at fault.
Machine has
1. Motor or component loose.
vibration or noisy
2. Grinding wheel at fault/arbor hole not
operation.
round.
3. Machine incorrectly mounted to workbench.
4. Motor bearings at fault.
5. Motor shaft bent.
Cutter edges burned
1. Not using correct grinding wheel.
or discolored; not
being properly
2. Sharpener adjustments not correct.
sharpened.
3. User placing grinding wheel against cutter
too long or too hard during sharpening
operation.
-28-
Troubleshooting
Possible Solution
1. Test for good contacts; correct the wiring.
2. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker.
3. Check/fix broken, disconnected, or corroded wires.
4. Replace switch.
5. Inspect/replace if at fault.
6. Test/repair/replace.
1. Reduce feed rate; replace grinding wheel; make
sure sharpener adjustments are correct for chain
(see Page 20).
2. Clean motor, let cool, and reduce workload.
3. Test/repair/replace.
4. Test/repair/replace.
1. Replace damaged bolts/nuts or tighten if loose.
2. Replace grinding wheel (refer to Page 20).
3. Tighten mounting hardware; use shims if necessary.
4. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
5. Test with dial indicator and replace motor.
1. Use the correct size and grit grinding wheel;
inspect, replace wheel (see Page 19).
2. Make sure sharpener adjustments are correct for
chain (see Page 19).
3. Raise the grinding wheel away from cutter as soon
as depth bolt hits depth stop.
Model T28959 (Mfd. Since 2/19)
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