Section 7: Service; Troubleshooting - Grizzly G4003G 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. Emergency Stop\RESET button engaged
start or a circuit or at fault.
breaker trips. 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.
Motor stalls or is 1. V-belt(s) slipping.
underpowered.
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.
Loud, repetitious 1. Pulley set screws or keys are missing or
noise coming from loose.
lathe at or near the 2. Motor fan is hitting the cover.
motor.
Motor overheats. 1. Motor overloaded.
Motor is loud when 1. Excessive depth of cut or feed rate.
cutting, or bogs 2. Spindle speed or feed rate wrong for
down under load. cutting operation.
3. Cutting tool is dull.
Model G4003G (Mfd. Since 1/15)

Troubleshooting

Possible Solution
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 (Pages 82
and 84).
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.
1. Tension/replace V-belt(s) (Page 73); 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.
1. Inspect keys and set screws. Replace or tighten if
necessary.
2. Tighten fan, shim cover, or replace items.
1. Allow motor to cool; reduce load on motor.
1. Decrease depth of cut or feed rate.
2. Refer to feed/speed charts in Machinery's
Handbook or feed/speed calculator on the internet.
3. Sharpen or replace the cutting tool.
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