Section 7: Service; Troubleshooting - Grizzly G0782 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.
Symptom Possible Cause
Machine does not 1. Emergency Stop/RESET button depressed/
start or a breaker
at fault.
trips.
2. Plug/receptacle at fault/wired wrong.
3. Incorrect power supply voltage or circuit
size.
4. Power supply circuit breaker tripped or fuse
blown.
5. Wiring open/has high resistance.
6. Thermal overload relay tripped/at fault.
7. Motor wires connected incorrectly.
8. ON/OFF switch at fault.
9. Start capacitor at fault.
10. Contactor not energized/has poor contacts.
11. Centrifugal switch at fault.
12. Spindle rotation switch at fault.
13. Motor at fault.
Machine stalls or is 1. Machine undersized for task.
underpowered.
2. Feed rate/cutting speed too fast.
3. Wrong workpiece material.
4. Belt slipping due to oil/grease contamination,
improper tension or excessive wear.
5. Motor wired incorrectly.
6. Motor overheated.
7. Run capacitor at fault.
8. Pulley/sprocket slipping on shaft.
9. Gearbox at fault.
Machine has 1. Motor or component loose.
vibration or noisy
operation.
2. Bit chattering.
3. V-belt(s) worn or loose.
4. Motor fan rubbing on fan cover.
5. Pulley loose or misaligned.
6. Motor mount loose/broken.
7. Machine incorrectly installed.
8. Motor bearings at fault.
Model G0782 (Mfd. Since 10/15)

Troubleshooting

Possible Solution
1. Rotate button head to reset; replace.
2. Test for good contacts; correct the wiring.
3. Ensure correct power supply voltage and circuit
size.
4. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker or replace fuse.
5. Check/fix broken, disconnected, or corroded wires.
6. Reduce load on motor if overheated; reset; replace.
7. Correct motor wiring connections.
8. Replace switch.
9. Test/replace.
10. Test all legs for power/replace.
11. Adjust/replace centrifugal switch if available.
12. Test/replace switch.
13. Test/repair/replace.
1. Use sharp tools at correct angle; reduce feed rate/
depth of cut; use coolant if possible.
2. Decrease feed rate/cutting speed.
3. Use correct type/size of metal.
4. Tension/replace belt(s) (Page 79); clean belt(s) of
any oil/grease.
5. Wire motor correctly.
6. Clean motor, let cool, and reduce workload.
7. Test/repair/replace.
8. Replace loose pulley/shaft.
9. Replace broken or slipping gears.
1. Inspect/replace damaged bolts/nuts, and retighten
with thread locking fluid.
2. Replace/sharpen bit; index bit to workpiece; use
correct feed rate and cutting RPM.
3. Inspect/replace belts with a new matched set
(Page 79).
4. Fix/replace fan cover; replace loose/damaged fan.
5. Re-align/replace pulley/shaft, pulley set screw, and
key.
6. Tighten/replace.
7. Tighten mounting bolts; relocate/shim machine.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
-71-