Troubleshooting - Powermatic 31A Instruction Manual & Parts List

TROUBLE SHOOTING for Model 31A Sander
Problem
Machine fails to start.
Belt won't track.
Abrasive disc comes free
of aluminum discs.
Belt slips or stalls on
application of pressure.
Disc stalls.
Excessive abrasive belt
replacement.
Belt arm won't index.
Cause
1. Faulty switch.
2. Bad motor.
3. Not connected to power source.
4. Connected to wrong voltage.
1. Platen shifted or worn.
2. Drum is worn.
3. Belt is streched unevenly.
1. Improperly bonded.
1. Abrasive belt tension inadequate. 1. Tighten belt.
1. Motor belt loose.
2. Disc shaft key missing.
1. Too much pressure.
2. Not using full width of belt.
1. Shot pin stuck.
2. Broken spring.
Solution
1. Replace switch.
2. Replace motor.
3. Check connection.
4. Reconnect to correct voltage.
1. Raise platen to1/32" beyond the apex of the
drum.
2. Replace drum.
3. Replace belt.
1. Clean adhesive off aluminum and
reapply adhesive.
2. Reduce pressure.
3. Tighten motor belt.
1. Tighten motor belt.
2. Replace pin.
1. Reduce pressure.
2. Stroke across belt using full width.
1. Remove arm and free shot pin.
2. Remove arm and replace spring.
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