a. Observe operation of the air compressor to make certain it starts and stops at the correct air pressure settings.
Proceed as follows:
(1) Refer to Figure 4-88 and drain down system air pressure at the air manifold drain valve(1) while observing the
system air pressure gage (2). The air compressor should turn on at approximately 1500 to 1550 psig (10340 to 10685
kPa). Then, close drain valve(1).
(2) Continue to watch the air pressure gages. The compressor should continue to operate until system air pressure
is between 1750 and 1800 psig (12063 to 1210 kPa).
(3) Notify direct support if the air pressure at which the air compressor actuates is too high or too low.
Shutdown the ROWPU before attempting to perform the rest of this inspection.
Loosen screw (3, Figure 4-89) and remove clamp (4) and air cleaner (5).
Remove two capscrews (6), washers (7), Iockwashers (8) and guard (9).
Inspect the fan and sheave drive belts for cracks or signs of wear such as fraying or hardening.
Inspect the motor sheave for cracks or other damage.
Inspect the air compressor cooling fins for dirt buildup. Clean with a brush and compressed air.
a. Refer to Figure 4-89 and change lubricating oil as follows:
(1) Remove dipstick (1).
(2) Place a suitable container beneath oil plug (2) and remove the oil plug. Allow oil to drain into the container.
(3) Replace plug (2).
(4) Using a funnel, refill the air compressor with lubricating oil through dipstick (1) opening. Refer to LO
Figure 4-89. Air Compressor Service