COUPLING AS 5053904 - Caterpillar

Illustration 1 g00943360
Remove the guard for the V-belt.
Illustration 2 g00943363
Illustration 3 g00953881
Inspect the condition of the belt (1) and the adjustment of the belt. The belt should deflect 10 mm (0.39 inch) under a straight pull of 44 N (10 lb). This measurement should be taken between the alternator pulley and the crankshaft pulley.Note: A 144-0235 Borroughs Belt Tension Gauge may be used to measure belt tension. This measurement should be taken between the alternator pulley and the crankshaft pulley. Refer to the following table for belt tension.
Table 1
Belt Tension
Initial     Belt Tension
Used    
534 22 N (120 5 lb)    
400 44 N (90 10 lb)    
Loosen the mounting bolt (2). Loosen the adjusting locknut (3) .
Move the alternator until the correct tension is reached.
Tighten the adjusting locknut. Tighten the mounting bolt.
Recheck the belt deflection. If the amount of deflection is incorrect, repeat step 4 to step 7.
Install the guard for the V-belt.
Close the engine access door.