1. Install the four bolts (figure 1, item 4), four flat washers (figure 1, item 5), four new lockwashers (figure1, item 6),
and four nuts (figure1, item 7) that secure the motor (figure1, item 8) to the foundation (figure 1, item 9). Do not
tighten at this time.
2. Position the belt on the compressor sheave (figure 2, item 3) and motor pulley (figure 2, item 2).
3. Slide the motor (figure 1, item 8) away from the compressor (figure 1, item 10) until the proper belt tension is
achieved. Proper tension is achieved when the belt may be deflected 1/2 inch (13 mm) at its midpoint(figure 2)
when applying approximately 4 to 5 pounds (1.8 to 2.3 kg) of force to the belt. A new belt should be tensioned
tighter (approximately 3/8 inch (10 mm) deflection). Tighten the four bolts (figure 1, item 4) and nuts (figure 1,
item 7) at this time.
4. Perform the Check Pulley/Sheave Alignment procedure as detailed in this work package.
5. Install the belt guard (figure 1, item 3) and secure it with the three lower screws (figure 1, item 1) and one
upper screw (figure 1, item 2).
6. If a new belt was installed, check the belt tension several times during the first 50 hours of operation. Adjust
if necessary. Use the procedure detailed in step 3 above for checking tension and adjusting the belt.
7. Perform the Follow-On Service procedure at the end of this work package.
REPLACE PRESSURE SWITCH
1. Remove the screw (figure 1, item 11) that secures the cover (figure 1, item 12) to the pressure switch
(figure 1, item 13). Remove the cover.
Replace the pressure switch only after the affected circuit has been secured, locked
out, and tagged out. Performing replacement with the circuit energized may re-
sult in death or serious injury.
2. Use a multimeter to check for available voltage at terminal L1 (figure 3, item 1) and L2 (figure 3, item 2). If
voltage is present, ensure that the proper circuit breaker is set to OFF, locked out, and tagged out (FM 55-
502). If no voltage is present, continue with the procedure.