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G0527 18" Wide Belt Sander -53-
Machine Troubleshooting
SYMPTOM
Sanding belt does not ten-
sion correctly; rollers slip
under belt.
Sanding belt runs off to one
side, stopping the sander.
Sanding belt will not start.
Motor will not start.
Motor will not start; fuses or
circuit breakers blow.
Motor overheats.
Motor stalls (resulting in
blown fuses or tripped cir-
cuit).
Loud, repetitious noise com-
ing from machine.
Conveyor belt not tracking
in center.
Conveyor belt slipping.
Emergency brake stops
slow.
Grinding noise when brak-
ing.
Machine slows when oper-
ating.
POSSIBLE CAUSE
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. Low voltage.
2. Open circuit in motor or loose con-
nections.
1. Short circuit in line cord or plug.
2. Short circuit in motor or loose con-
nections.
3. Incorrect fuses or circuit breakers
in power line.
1. Motor overloaded.
2. Air circulation through the motor
restricted.
1. Short circuit in motor or loose con-
nections.
2. Low voltage.
3. Incorrect fuses or circuit breakers
in power line.
4. Motor overloaded.
1. Pulley set screws or keys are miss-
ing or loose.
2. Motor fan is hitting the cover.
3. V-belt is defective.
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.
1. Feed rate too high.
2. Depth of cut too great.
CORRECTIVE ACTION
1. Adjust air pressure to 75 PSI at primary regulator.
2. Inspect all hoses and connections for leaking air; use water on sus-
pected 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. Check power line for proper voltage.
2. Inspect all lead connections on motor for loose or open connections.
1. Inspect cord or plug for damaged insulation and shorted wires.
2. Inspect all connections on motor for loose or shorted terminals or
worn insulation.
3. Install correct fuses or circuit breakers.
1. Reduce load on motor.
2. Clean out motor to provide normal air circulation.
1. Inspect connections on motor for loose or shorted terminals or worn
insulation.
2 Correct the low voltage conditions.
3. Install correct fuses or circuit breakers.
4. Reduce load on motor.
1. Inspect keys and set screws. Replace or tighten if necessary.
2. Tighten fan or shim cover.
3. Replace V-belt. See Maintenance section.
1. Re-adjust conveyor rollers.
1. Adjust conveyor rollers to place more tension on .
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).
1. Feed workpiece slower.
2. Reduce depth of cut.