Section 7: Service; Troubleshooting - Grizzly G0758 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. Blown fuse in machine.
start or a breaker
2. Chuck guard open.
trips.
3. incorrect power supply voltage.
4. plug/receptacle at fault/wired wrong.
5. power supply circuit breaker tripped or fuse
blown.
6. Motor wires connected incorrectly.
7. Wiring is open/has high resistance.
8. Motor brushes at fault.
9. Chuck guard safety switch at fault.
10. Circuit board at fault.
11. Motor at fault.
12. potentiometer/variable-speed dial at fault.
Machine stalls or is 1. Feed rate/cutting speed too fast.
overloaded.
2. Wrong cutter type.
3. Machine is undersized for task or tooling is
incorrect for task.
4. Motor wired incorrectly.
5. Motor bearings are at fault.
6. Motor has overheated.
7. Motor is at fault.
Machine has 1. Motor or machine component is loose.
vibration or noisy
operation.
2. Machine is incorrectly mounted or sits
unevenly.
3. Motor fan is rubbing on fan cover.
4. Workpiece not secure.
5. excessive depth of cut.
6. Cutter/tooling is loose.
7. Cutter is dull or at fault.
8. Bit is chattering.
9. Motor bearings are at fault.
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troubleshooting

possible Solution
1. replace fuse/ ensure there are no shorts.
2. Close guard.
3. ensure power supply voltage matches circuit
requirements.
4. test for good contacts; correct wiring.
5. ensure circuit is sized correctly and free of shorts.
reset circuit breaker or replace fuse.
6. Correct motor wiring connections.
7. Check for broken wires or disconnected/corroded
connections; repair/replace as necessary.
8. remove/replace brushes.
9. replace safety switch.
10. test/replace.
11. test/repair/replace.
12. test/replace.
1. decrease feed rate/cutting speed.
2. use correct cutter for task.
3. use smaller or sharper tooling; reduce feed rate or
spindle speed; use coolant fluid if possible.
4. ensure motor wiring is correct.
5. test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
6. Clean off motor, let cool, and reduce workload.
7. test/repair/replace motor.
1. inspect/replace stripped or damaged bolts/nuts, and
retighten with thread locking fluid.
2. tighten/replace mounting bolts in bench; relocate/
shim machine.
3. replace dented fan cover or damaged fan.
4. properly clamp workpiece on table or in vise.
5. decrease depth of cut.
6. Make sure tooling is properly secured.
7. replace/resharpen cutter.
8. replace/sharpen bit; index bit to workpiece; use
appropriate feed rate and cutting rpM.
9. test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
Model G0758 (Mfd. Since 2/14)