Section 7: Service; Troubleshooting - Grizzly G1066R 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 1. Emergency Stop button depressed/at fault
not start or a
(G1066Z).
breaker trips.
2. Incorrect power supply voltage or circuit size.
3. Power supply circuit breaker tripped/fuse
blown.
4. Machine circuit breaker tripped (G1079R).
5. Wiring open/has high resistance.
6. ON/OFF switch at fault
7. Start capacitor at fault.
8. Thermal overload relay has tripped.
9. Contactor not energized/has poor contacts.
10. Centrifugal switch at fault.
11. Motor at fault.
Machine 1. Workpiece material not suitable.
stalls or is
2. Feed rate too fast (G1066Z).
underpowered.
3. Excessive depth of cut.
4. Sandpaper roll loaded up.
5. Sandpaper roll worn or damaged.
6. Machine undersized for task.
7. Belt(s) slipping or pulleys misaligned.
8. Motor overheated.
9. Motor bearings at fault.
10. Run capacitor at fault.
11. Centrifugal switch at fault.
12. Motor at fault.
Machine has 1. Sandpaper roll loose.
vibration or
2. Machine not stable on floor.
noisy operation.
3. Belt(s) loose or worn.
4. Motor or component loose.
5. Pulley(s) loose or misaligned.
6. Motor fan rubbing on fan cover.
7. Worn drum bearings.
8. Centrifugal switch at fault.
9. Motor bearings at fault.
Model G1066R/Z/G1079R (Mfd. Since 02/24)

Troubleshooting

Possible Solution
1. Rotate Emergency Stop button to reset. Replace if at
fault (G1066Z).
2. Ensure correct power supply voltage and circuit size.
3. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker or replace fuse.
4. Reset circuit breaker on machine (G1079R).
5. Check/fix broken, disconnected, or corroded wires.
6. Test/replace.
7. Test/replace.
8. Allow to cool, then reset; replace.
9. Test all legs for power/replace if at fault.
10. Adjust centrifugal switch/contact points; replace if
necessary.
11. Test/repair/replace.
1. Ensure workpiece is suitable for sanding (Page 29).
2. Reduce feed rate (G1066Z) (Page 30).
3. Reduce depth of cut (Page 30).
4. Clean sandpaper roll (Page 35).
5. Replace sandpaper roll (Page 33).
6. Reduce feed rate/workpiece pressure.
7. Tension/replace belt(s) (Page 45); ensure pulleys
are aligned (Page 46).
8. Clean motor, let cool, and reduce workload.
9. Test/repair/replace.
10. Test/replace.
11. Test/replace.
12. Test for good contacts/correct wiring.
1. Re-install sandpaper roll (Page 33).
2. Relocate/shim machine; tighten mounting bolts.
3. Tension/replace belt(s) (Page 45).
4. Tighten mounting bolts; relocate/shim machine.
5. Secure pulley on shaft or realign (Page 46).
6. Fix/replace fan cover; replace loose/damaged fan.
7. Test/repair/replace.
8. Adjust centrifugal switch/contact points; replace if
necessary.
9. Test/repair/replace.
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