Powermatic WB-37, WB-25, WB-43 operating instructions Troubleshooting the Sander

Page 21

14.0Troubleshooting the Sander

Trouble

Sander will not start.

Sanding belt clogs too quickly.

Sanding belt will not run, or slips on the rollers.

Sanding belt keeps triggering the limit switches.

Machine takes too long to stop after emergency switch is activated.

Grinding noise when brake is activated.

Too much rounding occurs along edges when solid wood is sanded.

The front end of stock is thinner than the rear.

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.

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.

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	Make sure air pressure regulator is
to slip on rollers.	set at 75 to 80 PSI (page 9).

Dust or debris on conveyor rollers	Clean conveyor rollers.

Tracking adjustment/oscillation is not	Set tracking correctly. See page 12
correct.	and 13.

Air flow control is closed.	Open air flow control (page 13).

Sensors are blocked on the air	Clean the sensor areas on the
cylinder bracket.	cylinder bracket. See page 13.

Air pressure is too low.	Set air pressure to 75 to 80 PSI.

Brake pads are worn.	Replace brake pads.

Brake pads are worn.	Replace brake pads (rotor may need
	turning also).

Too much material is being removed,	Reduce the amount of material being
making the contact drum press too	removed.
tightly.

Rear pressure bar is too low in	Raise rear pressure bar (page 16-17).
relation to the contact drum.

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Contents Wide Belt Sanders Warranty Period Warranty and ServiceTable of Contents Pressure Bar Assembly Models WB-25, WB-37, WB-43 16.8.2 Safety warnings Safety warnings 1790843 Introduction SpecificationsUnpacking Contents of Shipping ContainerAssembly Air Supply ConnectionDust Collection Installing/Replacing Sanding Belt ElectricalGrounding Instructions Model WB-25 shown 230 Volt Operation460 Volt Conversion AdjustmentsExtension cords Sanding Belt Tracking OscillationOscillation Speed Oscillation Air FlowBelt Tension and Replacement Platen PositionReplacing Graphite and Felt Pad Conveyor Belt Tracking Conveyor Belt TensionFeed Rate Pressure Bar AdjustmentTable Parallelism Operating Controls Amperage Meter LED Controller and Keypad Braking System OperationDust Port Layout MaintenanceTrouble Troubleshooting the SanderTrouble Replacement Parts Troubleshooting the LED UnitBase and Motor Assembly Model WB-25 only Index No. Part No Description Size Qty Parts List Base and Motor Assembly Model WB-25Base and Motor Assembly Model WB-37 only Parts List Base and Motor Assembly Model WB-37 Base and Motor Assembly Model WB-43 only Parts List Base and Motor Assembly Model WB-43 Upper Cabinet Assembly Model WB-25 only Parts List Upper Cabinet Assembly Model WB-25 Upper Cabinet Assembly Models WB-37, WB-43 Parts List Upper Cabinet Assembly Model WB-43 Parts List Upper Cabinet Assembly Model WB-37Table Raising Assembly Models WB-25, WB-37, WB-43 Parts List Table Raising Assembly Model WB-25 Parts List Table Raising Assembly Model WB-37 Parts List Table Raising Assembly Model WB-43 Hex Screw 12x4 Table and Conveyor Belt Assembly Models WB-25, WB-37, WB-43 WB25-IRA Parts List Table and Conveyor Belt Assembly Model WB-25WB37-IRA Parts List Table and Conveyor Belt Assembly Model WB-37WB43-IRA Parts List Table and Conveyor Belt Assembly Model WB-43Parts List Pressure Bar Assembly Model WB-25 Pressure Bar Assembly Models WB-25, WB-37, WB-43Parts List Pressure Bar Assembly Model WB-43 Parts List Pressure Bar Assembly Model WB-37Parts List Platen Assembly Model WB-25 Platen Assembly Model WB-25 only6290294 Parts List Platen Assembly Model WB-37 Platen Assembly Models WB-37, WB-43Parts List Platen Assembly Model WB-43 WB43-717 Parts List Air Regulator Assembly Model WB-25 Air Regulator Assembly Models WB-25, WB-37, WB-43Parts List Air Regulator Assembly Model WB-37 Parts List Air Regulator Assembly Model WB-43 Sanding Belt and Accessories Models WB-25, WB-37, WB-43 Parts List Sanding Belt and Accessories Model WB-25 Parts List Sanding Belt and Accessories Model WB-37Parts List Sanding Belt and Accessories Model WB-43 Tension Roller Assembly Models WB-25 and WB-37 only Parts List Tension Roller Assembly Model WB-25 Parts List Tension Roller Assembly Model WB-37 Seal Tension Roller Assembly Model WB-43 only Parts List Tension Roller Assembly Model WB-43 WB43-163 Electrical Box Assembly Models WB-25 and WB-37 Parts List Electrical Box Assembly Model WB-25 Parts List Electrical Box Assembly Model WB-37 Electrical Box Assembly Model WB-43 only Parts List Electrical Box Assembly Model WB-43 Models WB-25 and WB-37 only Electrical ConnectionsModel WB-43 only