Troubleshooting: Motor and Electrical Problems
Trouble
Sander will not start.
Drum motor overloads.
Conveyor motor oscillates.
Drum motor or conveyor motor stalls.
Motor overload protector trips or shop wiring breaker trips.
Probable Cause | Remedy | |
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| Check plug connections. Connect | |
No incoming power. | main cord to power source, and motor | |
| cord into control box receptacle. | |
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Circuit fuse blown or breaker tripped. | Replace fuse or | |
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Switch is malfunctioning. | Replace switch. | |
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Inadequate circuit. | Check electrical requirements. | |
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Feed rate too fast or depth of cut too | Reduce feed rate and/or depth of cut. | |
large. | ||
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Motor not properly aligned. | Loosen housing bolts, run motor, re- | |
tighten bolts. | ||
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Transfer rod collar is worn. | Replace transfer rod collar. | |
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Drive roller is bent. | Replace drive roller. | |
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Excessive depth of cut. | Reduce depth of cut; use coarser grit; | |
reduce feed rate. | ||
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Improper conveyor belt tension. | Adjust tension (see page 15). | |
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Excessive load on sanding drum and | Allow motor to cool and | |
motor. | overload button. | |
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| Connect sander to a dedicated circuit. | |
Too many tools on circuit. | Have a certified electrician correct | |
| any shop wiring problem. | |
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Excessive length or inadequate size | Use a shorter or heavier gauge | |
extension cord. | extension cord (see Figure 17). | |
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Troubleshooting: Mechanical Problems
Trouble | Probable Cause | Remedy | |
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Conveyor belt does | Shaft coupling (#20, page 32) is loose | Align the shaft flats of the gear motor | |
not move, or runs | and the drive roller and tighten the | ||
or unattached. | |||
intermittently. | |||
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Conveyor belt slips | Improper conveyor belt tension. | Adjust belt tension. | |
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| Reduce depth of cut; reduce feed | ||
on drive roller. | Excessive depth of cut or feed rate. | ||
| rate. | ||
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| Tension rollers too high. | Lower tension rollers (see page 18). | |
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| Excessive feed rate. | Reduce feed rate. | |
Board slips on |
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Dirty or worn conveyor belt. | Replace conveyor belt. | ||
conveyor belt. | |||
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| Abrasive improperly wrapped. | Read “Installing Abrasives” on pages | |
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