Model G0750G (Mfd. Since 5/15)
-67-
SECTION 7: SERVICE
Troubleshooting
Motor & Electrical
Symptom
Possible Cause
Possible Solution
Machine does not
start or a circuit
breaker trips.
1. Reset/emergency stop button engaged or
at fault.
2. Fuse has blown in machine electrical box.
3. Power supply switched OFF or at fault.
4. Motor/plug wired incorrectly.
5. Thermal overload relay has tripped.
6. Wall fuse/circuit breaker is blown/tripped;
short in electrical system; start-up load too
high for circuit.
7. Start capacitor at fault.
8. Contactor not getting energized/has burned
contacts.
9. Wiring is open/has high resistance.
10. Motor is at fault.
1. Rotate button clockwise until it pops out to reset it
for operation; replace if not working properly.
2. Replace fuse/ensure no; determine if overload is
due to heavy operation; ensure power source has
high enough voltage and power cord is correctly
sized.
3. Ensure power supply is ON/has correct voltage.
4. Correct motor/plug wiring connections (
Page 85).
5. Turn the thermal relay cut-out dial to increase
working amps and push the reset pin. Replace if
tripped multiple times (weak relay).
6. Verify circuit is rated for machine amp load;
troubleshoot and repair cause of overload; replace
weak breaker; find/repair electrical short.
7. Test/replace if faulty.
8. Test for power on all legs and contactor operation.
Replace unit if faulty.
9. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
10. Test/repair/replace.
Motor stalls or is
underpowered.
1. Belt(s) slipping.
2. Run capacitor at fault.
3. Plug/receptacle at fault.
4. Gearbox at fault.
5. Contactor not energized/has poor contacts.
6. Motor bearings at fault.
7. Motor at fault.
1. Tension/replace belt(s); ensure pulleys are aligned.
2. Test/repair/replace.
3. Test for good contacts/correct wiring.
4. Select appropriate gear ratio; replace broken or
slipping gears.
5. Test all legs for power/replace if faulty.
6. Test/repair/replace.
7. Test/repair/replace.
Loud, repetitious
noise coming from
lathe at or near the
motor.
1. Pulley set screws or keys are missing or
loose.
2. Motor fan is hitting the cover.
1. Inspect keys and set screws. Replace or tighten if
necessary.
2. Tighten fan, shim cover, or replace items.
Motor overheats.
1. Motor overloaded.
1. Allow motor to cool; reduce load on motor.
Motor is loud when
cutting, or bogs
down under load.
1. Excessive depth of cut or feed rate.
2. Spindle speed or feed rate wrong for
cutting operation.
3. Cutting tool is dull.
1. Decrease depth of cut or feed rate.
2. Refer to the feeds and speed charts in
Machinery's
Handbook or a speeds and feeds calculator on the
internet.
3. Sharpen or replace the cutting tool.
Review the troubleshooting and 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.
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