MAINTENANCE
-32-
Troubleshooting
SYMPTOM
Lines across width of work-
piece.
Glossy spots or streaks on
workpiece.
Sanding belt clogs quickly.
Sanding belt does not tension
correctly; rollers slip under
belt.
Sanding belt runs off to one
side, stopping the sander.
Sanding belt will not start.
Poor, non-aggressive sanding
results.
Conveyor belt not tracking in
center.
Conveyor belt slipping.
Emergency brake stops slow.
Grinding noise when braking.
POSSIBLE CAUSE
1. Sanding belt seam is open or dam-
aged.
1. Worn sanding belt.
2. Rear pressure roller too low.
1. Sanding belt grit too small for par-
ticular job.
2. Excessive depth of cut.
3. Wood is too moist.
1. Low air pressure.
2. Air leaks in system.
1. Air eye fork clogged.
2. Oscillation return valve closed.
3. Oscillation timing incorrect.
1. Sanding belt is not tensioned.
2. Limit switches engaged.
3. Emergency stop plate engaged.
1. Platen adjusted incorrectly, above
bottom surface level of lower sand-
ing rollers.
2. Sanding belt loaded with sawdust.
3. Sanding belt worn out.
1. Conveyor rollers moved out of
adjustment.
1. Conveyor rollers have incorrect
tension.
2. Conveyor rollers contaminated with
dirt or dust.
1. Air pressure incorrect.
2. Air leak in system.
3. Brake rotor contaminated with oil.
4. Brake pads worn out.
1. Brakes severely worn out.
HOW TO REMEDY
1. Repair or replace sanding belt.
1. Replace sanding belt.
2. Raise rear pressure roller. (See warning in Pressure Roller
section!)
1. Replace with a coarser grit sanding belt.
2. Reduce depth of cut.
3. Allow wood to dry out.
1. Adjust air pressure to 75 PSI at primary regulator.
2. Inspect all hoses and connections for leaking air; use water
on suspected area to detect bubbles.
1. Clean the intake hole on the air eye fork.
2. Open valve.
3. Adjust oscillation timing.
1. Tension sanding belt.
2. Center sanding belt so it is not touching the limit switches.
3. Make sure emergency stop switch is released.
1. Adjust platen on the same plane as, or lower than, bottom
surface level of lower rollers.
2. Clean sanding belt to unload sawdust.
3. Replace sanding belt with a new one.
1. Re-adjust conveyor rollers.
1. Adjust conveyor rollers to increase tension.
2. Clean conveyor rollers.
1. Adjust air pressure to 75 PSI.
2. Find and fix air leaks.
3. Clean brake rotor with automotive brake parts cleaner.
4. Replace brake pads.
1. Replace brake pads, have rotor turned (possibly replaced).
