AIR COMPRESSOR (cont)
112. Apply air pressure to El safety valve (39) of intercooler (19) and check that intercooler safety valve opens at 60 psi
(414 kPa). Replace damaged intercooler safety valve.
113. Apply air to unloading valves (69) and (74) and check that unloading valves open at 130 psi (910 kPa) and close at
140 psi (896 kPa). If unloading valves do not open and close at specified psi, refer to paragraph 3-45 and adjust air
114. Apply air pressure to main reservoir safety valve and check that main reservoir safety valve opens at 150 psi (1034
kPa). Adjust main reservoir safety valve by turning regulating nut. Replace damaged main reservoir safety valve.
115. Inspect tested air compressor by the following:
Check that oil has not escaped through crankcase breather or dipstick opening. If oil has spilled out, replace oil
seals or crankcase breather.
Remove valve assemblies and check that there are no broken springs or cut or broken valves. Check that there
is no scoring.
If pistons, cylinders, rings, piston pins, connecting rods, or bearings are replaced, orifice test must be
Remove cylinder heads and inspect cylinder walls. Check that there is no scoring.