Section 7: Service; Troubleshooting - Grizzly G0747 Owner's Manual

SECTION 7: SERVICE

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 at (570) 546-9663.
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 or wired incorrectly.
start or a breaker
2. power supply is switched OFF or at fault.
trips.
3. Motor connections wired incorrectly.
4. spindle switch at fault.
5. Motor windings or motor at fault.
Machine stalls or is 1. Machine undersized for task.
overloaded.
2. Workpiece not securely clamped to table or
mill vise.
3. dull, damaged or incorrect cutting tool.
4. spindle speed is incorrect for operation.
5. Motor connections wired incorrectly.
6. plug/receptacle at fault or wired incorrectly;
incorrect voltage from power supply.
7. pulley loose.
8. Motor bearings at fault.
9. Motor overheated.
10. Motor at fault.
Machine has 1. tool holder or cutter at fault.
vibration or noisy
operation.
2. Workpiece alignment poor.
3. spindle and spindle clutch are not properly
meshed.
4. Motor or component loose.
5. pulley loose.
6. Machine incorrectly mounted to floor or sits
unevenly.
7. Motor bearings at fault.
8. gearbox at fault.
Model G0747/G0748 (Mfg. Since 8/12)

Troubleshooting

Possible Solution
1. test for good contacts; correct the wiring.
2. ensure hot lines have correct voltage on all legs
and main power supply is switched ON.
3. Correct motor wiring connections (Pages 57 & 58).
4. replace faulty spindle switch.
5. replace motor.
1. use smaller, sharp tools; reduce feed rate; reduce
spindle speed; use coolant.
2. Make sure workpiece is properly clamped to table or
mill vise; use work holding jig if necessary.
3. use sharp and correct cutting tool for operation.
4. select appropriate spindle speed (Page 33 or 35).
5. Correct motor wiring connections (Pages 57 & 58).
6. test for good contacts; correct wring problems;
ensure hot lines have correct voltage on all legs.
7. re-align/replace shaft, pulley, set screw, or key as
required.
8. test by rotating shaft; rotation grinding/loose shaft
requires bearing replacement.
9. let motor cool, clean off, and reduce workload.
10. replace motor.
1. replace out-of-round tool holder; replace/re-
sharpen cutter; use appropriate feed rate and
spindle speed.
2. eliminate workpiece bindings; use vise or clamps as
required for proper workpiece alignment control.
3. Make sure the spindle and spindle clutch are
properly meshed.
4. inspect/replace stripped or damaged bolts/nuts, and
re-tighten with thread-locking fluid.
5. re-align/replace shaft, pulley, set screw, or key as
required.
6. re-tighten/replace mounting bolts in floor; relocate/
shim machine.
7. test by rotating shaft; rotation grinding/loose shaft
requires bearing replacement.
8. rebuild gearbox and replace worn/damaged gears
and bearings.
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