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G0644 15" Open-End Wide Belt Sander
-29-
Review the troubleshooting and procedures in this section to fix or adjust your machine if a problem devel-
ops. If you need replacement parts or you are unsure of your repair skills, then feel free to call our Technical
Support at (570) 546-9663.
SECTION 7: SERVICE
Troubleshooting
Motor & Electrical
Symptom Possible Cause Possible Solution
Motor does not start
or a breaker trips.
1. Compressed air to the machine is not at 57
PSI.
2. Sanding motor is not on (conveyor motor).
3. Emergency stop push-button is engaged/
faulty.
4. Air pressure safety switch is at fault.
5. Switch disabling key is removed (conveyor
motor).
6. Plug/receptacle is at fault or wired incor
-
rectly.
7. Start capacitor is at fault.
8. Conveyor speed dial is at fault.
9. Motor connection wired incorrectly.
10. Wall fuse/circuit breaker is blown/tripped.
11. Thermal overload relay has tripped.
12. Contactor not getting energized/has burnt
contacts.
13. Power supply switched OFF or is at fault.
14. Wiring is open/has high resistance.
15. Motor ON button (sanding motor) or ON/
OFF switch (conveyor motor) is at fault.
16. Centrifugal switch is at fault.
17. Motor is at fault.
1. Connect clean, dry compressed air to the machine at
57 PSI.
2. Turn sanding motor on before conveyor motor.
3. Rotate clockwise slightly until it pops out/replace it.
4. Test/replace air pressure safety switch; adjust (
Page
33).
5. Install switch disabling key.
6. Test for good contacts; correct the wiring.
7. Test/replace if faulty.
8. Test/replace if faulty.
9. Correct motor wiring connections.
10. Ensure circuit size is suitable for this machine;
replace weak breaker.
11. Turn cut-out dial to increase working amps and push
the reset pin. Replace if tripped multiple times (weak
relay).
12. Test for power on all legs and contactor operation.
Replace unit if faulty.
13. Ensure power supply is switched on; ensure power
supply has the correct voltage.
14. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
15. Replace faulty ON button or ON/OFF switch.
16. Adjust/replace the centrifugal switch if available.
17. Test/repair/replace.
Machine has vibra
-
tion or noisy opera
-
tion (a metallic
"thump" sound dur
-
ing operation is nor
-
mal).
1. Motor or component is loose.
2. Motor mount loose/broken.
3. Motor fan is rubbing on fan cover.
4. Motor bearings are at fault.
5. Centrifugal switch at fault.
1. Inspect/replace stripped or damaged bolts/nuts, and
re-tighten with thread locking fluid.
2. Tighten/replace.
3. Replace dented fan cover; replace loose/damaged
fan.
4. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
5. Replace.
troubleshooting