2.Clean the AC drive fins:

a.Remove the AC drive box cover.

b.Blow the fins clean using compressed air at a pressure of 60–90 psi or by using canned compressed air. Use care to avoid damaging cooling fan or other components.

Note: No amount of visible foreign matter should be allowed to accumulate on the fins or the finger guard.

3.Use the following procedures to determine if V-belts require replacement or adjustment. Call a qualified service technician in either case.

a.Check V-belts for uneven wear and frayed edges.

b.After disconnecting power to the machine and removing all panels necessary for access to the drive belt, use the following method to verify that V-belts are properly tensioned.

See Figure 28. Belt deflection should be measured as close to the center of the span length as possible. A set force should be applied in the center of the span length, as specified in the following table. Belt tension is adjusted by turning the setscrew on the idler pulley. Turning the screw clockwise tightens the belt, and vice versa.

 

Maintenance

 

 

 

Machine

Deflection

Force

Capacity

Applied

(in.)

(lbs.)

(lbs.)

 

 

 

 

35

0.39

5.6

 

 

 

50

0.43

5.6

 

 

 

85

0.77

11.3

 

 

 

Deflection

Span Length

Figure 28

c.Verify that V-belts are properly aligned by checking pulley alignment. Place a straightedge across both pulley faces. The straightedge should make contact with the pulleys in four places. See Figure 29.

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