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Model G1066R/Z/G1079R (Mfd. Since 02/11)
SECTION 7: SERVICE
Troubleshooting
Motor & Electrical
Symptom
Possible Cause
Possible Solution
Machine does
not start or a
breaker trips.
1. Emergency Stop button depressed/at fault
(G1066Z).
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.
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.
Machine
stalls or is
underpowered.
1. Workpiece material not suitable.
2. Feed rate too fast (G1066Z).
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.
1. Ensure workpiece is suitable for sanding (
Page 29).
2. Reduce feed rate (G1066Z) (
Page 32).
3. Reduce depth of cut (
Page 31).
4. Clean sandpaper roll (
Page 30).
5. Replace sandpaper roll (
Pages 33–34).
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.
Machine has
vibration or
noisy operation.
1. Sandpaper roll loose.
2. Machine not stable on floor.
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.
1. Re-install sandpaper roll (
Pages 33–34).
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.
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.
