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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.
Motor & Electrical
Symptom
Possible Cause
Machine does not
1. Emergency stop button engaged/at fault.
start or a breaker
2. Master power switch off/at fault.
trips
3. Chip guard open/limit switch at fault.
4. Incorrect power supply or incoming
connections.
5. Power supply circuit breaker tripped.
6. Plug/receptacle at fault/wired incorrectly.
7. Motor connection wired incorrectly.
8. Wiring open/has high resistance.
9. Motor or motor components at fault.
Machine stalls,
1. Feed rate/cutting speed too fast.
lacks power or is
2. Machine is undersized or tooling is
overloaded.
incorrect for the task.
3. Motor bearings are at fault.
4. Motor overheats.
5. Motor or motor components at fault.
Machine has
1. Excessive depth of cut.
vibration or noisy
2. Tooling is loose or improperly installed.
operation.
3. Tooling is dull or chattering.
4. Machine is incorrectly anchored or sits
unevenly.
5. Motor or machine component is loose.
6. Motor fan is rubbing on fan cover.
7. Motor bearings are at fault.
Lamp will not light.
1. Master power switch not turned on.
2. Bulb is burned out.
3. Short in wiring or wired incorrectly.
Tapping mode does
1. Machine is not in "Tapping Mode."
not work.
2. Shorted/disconnected wiring.
Model G0793 (Mfd. Since 02/15)
Troubleshooting
Possible Solution
1. Rotate button to reset/replace it.
2. Turn master power switch to ON position/replace it.
3. Close guard/replace limit switch.
4. Ensure power supply is correct voltage (Page 10),
and connected properly (Page 17).
5. Ensure circuit size is correct/replace weak breaker.
6. Test for good contacts; correct the wiring.
7. Correct motor wiring connections (Page 46).
8. Check/fix broken, disconnected, or corroded wires.
9. Test/repair/replace.
1. Decrease feed rate/cutting speed.
2. Use smaller or sharper tool; reduce feed rate or
spindle speed; use coolant if possible.
3. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
4. Clean off motor, let cool, and reduce workload.
5. Test/repair/replace motor.
1. Decrease depth of cut.
2. Make sure tooling is properly secured.
3. Replace/resharpen tooling; index bit to workpiece;
use appropriate feed rate and cutting RPM.
4. Tighten/replace anchors; relocate/shim machine.
5. Inspect/replace stripped or damaged bolts/nuts, and
re-tighten with thread locking fluid.
6. Replace dented fan cover or damaged fan.
7. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
1. Turn master power switch to ON position.
2. Replace bulb.
3. Trace and test wiring. Fix any errors.
1. Rotate switch to "Tapping Mode."
2. Inspect circuit boards, wiring connections. Replace/
repair as necessary.
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