Powermatic WB-37, WB-25, WB-43 operating instructions Conveyor Belt Tension, Conveyor Belt Tracking

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1. Disconnect sander from power source.

2. Loosen the lower hex nut (A, Figure 11/12) on the motor base.

3. Tighten the top hex nut (B, Figure 11/12) to lower the motor plate until proper tension is achieved.

4. When the belt is properly tensioned, you should be able to push in the belt approximately 3/4” at a point midway between the pulleys using moderate finger pressure.

5. Re-tighten the bottom hex nut (B, Figure 11/12) against the bottom of the motor plate.

If installing a new v-belt, use the hex nuts to raise the motor plate enough to remove the old belt and mount the new one.

NOTE: When replacing v-belts on the main motor, replace the entire set of three simultaneously.

9.7 Conveyor Belt Tension

Check the tension of the conveyor belt on the infeed and outfeed rollers – the conveyor belt should be tight enough that you cannot shift it with your hands. If the conveyor belt needs tightening, proceed as follows.

1.	Disconnect sander from power source.
2.	Rotate the adjustment screws (the left one
	is shown in Figure 13) as needed with a	Figure 13
	19mm wrench. Rotate clockwise to increase	Figure 13
	tension, counter-clockwise to decrease
	tension. (NOTE: Removal of the emergency
	stop cover is not necessary for tensioning.)
NOTE: Do not over-tighten the screws as this
will hasten wear of the conveyor belt.

9.8 Conveyor Belt Tracking

The conveyor belt should remain centered upon the rollers during operation. If it approaches to either the left or right side, adjustment is necessary.

First check that the conveyor belt tension is correct. If the tension needs adjustment, do this first before you adjust the tracking (see “Conveyor Belt Tension”). Then proceed as follows.

Conveyor belt tracking should be adjusted while the conveyor belt is running. Make adjustments in increments and allow the conveyor belt time to respond to each change.

Keep hands away from the moving conveyor belt.

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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 Operation Sanding Belt Tracking Oscillation Adjustments 460 Volt Conversion Extension cordsOscillation 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 MeterLED 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