Southbend SB1021, SB1022 manual Belts, Dressing Rubber Tires, To check/tension/replace the V-belts

Model SB1021/SB1022 M A I N T E N A N C E For Machines Mfg. Since 8/09

V-Belts

To ensure optimum power transfer from the motor to the blade, the V-belts must be in good condition and operate under proper tension.

Check V-belt tension at least every three months—more often if the bandsaw is used daily. V-belts stretch with use and must be periodically re-tensioned. Replace the V-belts if they are cracked, frayed, or badly worn. Refer to Figure 38 to identify V-belt locations.

	Sprocket Drive	!
	Pulley
	Sprocket
	Drive Belt
	Air Pump
Tensioner
Intermediate	Left/Right Speed
Pulley	Pulley Belts

Figure 38. System belt and pulley layout.

To check/tension/replace the V-belts:

1.DISCONNECT BANDSAW FROM POWER!

2.Remove the rear motor access panel.

3.Push the center of each V-belt with moderate force. When tensioned correctly, there should be approximately 3⁄16" of deflection. DO NOT overtighten the belts or the bearings will wear prematurely.

Speed Hub Belts

Rotate the speed handle left or right until the belts are loose. Roll the belts off the pulleys to replace them. (If you get them mixed up when replacing, the belt on the left is the larger of the two.)

Note: When the machine is started, the belts will automatically adjust to the correct tension.

Sprocket Drive Belt

Use a 17mm wrench and loosen the tensioner hex bolt. Next use a 6mm hex wrench to loosen the three intermediate pulley retaining cap screws so the belt is loose. Replace the sprocket drive belt. Re-tighten the intermediate hub and adjust the tensioner hub to tension the new belt.

Air Pump Belt

Use a 10mm wrench to loosen the pump mounting bolts, replace the belt and tension it by positioning the air pump, then tighten the mounting bolts.

Note: Make sure that when tightened, the pump pulley is aligned with the motor drive pulley.

Dressing Rubber Tires

As the bandsaw ages, the rubber tires on the wheel may need to be redressed if they become hardened or glazed over. Dressing the rubber tires improves blade tracking and reduces vibration/blade lead.

If the rubber tires become too worn, then blade tracking will become extremely difficult. At that point, redressing will no longer be effective, and the rubber tires must be replaced.

To redress the rubber tires:

1.DISCONNECT BANDSAW FROM POWER!

2.Put on heavy gloves and remove the blade.

3.Use a brush and shop vacuum to clean any chips from the rubber tires.

4.Hold a piece of 100-grit sandpaper against the rubber tire and rotate the wheel by hand. Only redress the rubber enough to expose a fresh rubber surface.

a.Check surface area of tire to ensure a uniformly sanded surface.

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