Powermatic WB-25 - Manual (Page 21)

21
Troubleshooting the Sander
Trouble Probable Cause Remedy
No incoming power. Check that sander is connected to
power, fuses are not blown or circuit
breakers are not tripped.
Low voltage. Check voltage at power source.
Loose wiring. Inspect and remedy any loose
connections on sander.
Starting switch is defective. Replace switch.
Sander will not start.
Motor is defective. Replace motor.
Grit of sanding belt is too fine. Choose a larger grit of sanding paper.
Too much material being sanded off. Reduce the amount of material being
removed.
Wood is too oily. Choose different stock.
Too much dirt or glue on the wood. Choose cleaner stock.
Sanding belt clogs
too quickly.
Wood is too moist. Allow wood to dry before sanding.
Air valve switch is Off. Turn on air valve.
Emergency stop button is engaged. Disengage the stop button.
Limit switches are activated. Position sanding belt so it is between
the limit switches.
Insufficient air pressure causing belt
to slip on rollers. Make sure air pressure regulator is
set at 75 to 80 PSI (page 9).
Sanding belt will not
run, or slips on the
rollers.
Dust or debris on conveyor rollers Clean conveyor rollers.
Tracking adjustment/oscillation is not
correct. Set tracking correctly. See page 12
and 13.
Air flow control is closed. Open air flow control (page 13).
Sanding belt keeps
triggering the limit
switches.
Sensors are blocked on the air
cylinder bracket. Clean the sensor areas on the
cylinder bracket. See page 13.
Air pressure is too low. Set air pressure to 75 to 80 PSI. Machine takes too
long to stop after
emergency switch is
activated.
Brake pads are worn. Replace brake pads.
Grinding noise when
brake is activated. Brake pads are worn. Replace brake pads (rotor may need
turning also).
Too much rounding
occurs along edges
when solid wood is
sanded. Too much material is being removed,
making the contact drum press too
tightly. Reduce the amount of material being
removed.