Delta (Model 31-300) instruction manual Locking Switch in the OFF Position, Overload Protection

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LOCKING SWITCH IN THE “OFF” POSITION

IMPORTANT: When the tool is not in use, the switch should be locked in the “OFF” position to prevent unauthorized use, using a padlock (A) Fig. 17 with a 3/16" diameter shackle.

OVERLOAD PROTECTION

The motor supplied with your sander is equipped with a reset overload relay button (A) Fig. 18. If the motor shuts off or fails to start because of overloading (sanding too heavy, using a worn sanding belt or disc, using the sander beyond its capacity), or low voltage, turn the switch (A) Fig. 16 to the “OFF” position. Let the motor cool three to five minutes and push the reset button

(A) Fig. 18. Start the motor.

ADJUSTING TENSION AND

TRACKING OF THE BELT

IMPORTANT: The machine is shipped without belt tension. Before operating the machine, follow these instructions for adjusting the belt for tension and tracking.

DISCONNECT MACHINE FROM POWER SOURCE.

1.Loosen the two lock knobs (A) Fig. 19, and remove the top cover (B).

2.Turn the belt tension lever (C) Fig. 20 counter-clockwise to increase the belt tension. NOTE: The tension lever (C) is spring-loaded and can be repositioned by pulling out the handle, moving it, and letting it spring back into position. Correct tension is determined by:

(A) flatness of the belt on the plate.

(B slippage of the belt when sanding heavy work.

3.Rotate the belt (D) Fig. 21 by hand, and tighten or loosen the tracking knob (E) Figs. 20 and 21 until the belt is tracking correctly.

4.Turn the tool on and off to check for proper tracking. If the belt is leading to one side or the other, very gently turn the tracking knob (E) Fig. 20 clockwise to move the belt to the right or counterclockwise to move the belt to the left.

5.A final adjustment can be made with the motor running.

THIS ADJUSTMENT SHOULD BE VERY SLIGHT.

6.Replace the top cover that was removed in STEP 1.

B

A

Fig. 19

E

C

Fig. 20

D

E

Fig. 21

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Contents Sanding Center 6 Belt/12 Disc Sander Important Safety Instructions Table of ContentsCalifornia Proposition Safety Guidelines DefinitionsImportant Safety Instructions General Safety RulesRefer to them often and use them to instruct others Additional Specific Safety RulesMotor Specifications Power ConnectionsGrounding Instructions Extension Cords Volt Single Phase OperationFunctional Description Unpacking and Cleaning AssemblyAssembly Tools Required Assembling StandAttaching Motor to Stand Installing Drive Belt and Belt GuardAttaching Machine to Stand Attaching Disc Table Attaching Sanding DiscAttaching Belt Table OperationStarting and Stopping the Machine Adjusting Tension Tracking of the Belt Locking Switch in the OFF PositionOverload Protection Tilting the Belt Sander Table Adjusting Sanding Belt Degrees to BeltChanging Position of Sanding ARM Tilting the Disc Sander Table Adjusting Sanding Disc Degrees to DiscReplacing Sanding Belt Power TAKE-OFF ShaftReplacing Sanding Disc Sanding Inside Curves Surfacing or Edge Sanding with Sanding BeltSanding Outside Curves END Sanding Wide Workpieces with the Belt END Sanding with the DiscService Troubleshooting MaintenanceWarranty AccessoriesPage Page Canadian PORTER-CABLE Delta Service Centers