TM 55-2210-224-34
4-8. AIR COMPRESSOR ASSEMBLY (cont)
ASSEMBLY (cont)
71.
Turn crankshaft (166) and check that the crankshaft, high-pressure piston assembly (126), and low-pressure
piston assembly (120) turn freely with no binding.
72.
Use a small amount of grease to hold in place and install ring gasket (95) on low-pressure unloader valve (94).
Slowly lower unloader valve into low-pressure cylinder head (97). After the valve is in place, rotate to check that
it is seated and free.
73.
Use a small amount of grease to hold in place and install ring gasket (93) on low-pressure discharge valve (92).
Slowly lower discharge valve into low-pressure cylinder head (97). After the valve is in place, rotate to check
that it is seated and free.
74.
Position ring gasket (91) and low-pressure discharge valve cover (90) and install four capscrews (89). Install
three setscrews (88), gaskets (87), and acorn nuts (86). Torque nuts to 16 +1 lb-ft (22.4 +1.4 N.m).
75.
Position ring gasket (84) and low-pressure unloader valve cover (83) and install four capscrews (82). Install
elbow (85), three setscrews (81), gaskets (80), and acorn nuts (79). Torque nuts to 16 +1 lb-ft (22.4 +1.4 N.m).
76.
Assemble valve cover assembly (58) by the following:
a.
Position upper unloader plunger (77), upper plunger unloader spring (76), valve clamp (75), and lower
unloader plunger (74) in valve cover (78). Install nut (73) and cotter pin (72).
b.
Position diaphragm (71), elbow (70), and diaphragm cap (69) on valve cover (78) and install six
capscrews (68).
77.
Assemble high-pressure unloader valve (61) by the following: a. Assemble valve bumper (67), three valve
springs (66), valve disc (65), and valve seat (64). b. Secure with screw (63).
78.
Use a small amount of grease to hold in place and install ring gasket (62) on high-pressure unloader valve (61).
Slowly lower unloader valve into high-pressure cylinder head (103). After the valve is in place, rotate to check
that it is sealed-and free.
79.
Position low plunger spring (60), seat gasket (59), and valve cover assembly (58) and install three capscrews
(57). Install three setscrews (56), gaskets (55) and acorn nuts (54).
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