Section VI. COMPRESSOR ASSEMBLY AND AIR LINES
4-22. General
resume when pressure drops to 150 psi. A centri-
The lubricating unit is equipped with a two stage 23
fugal unloader automatically opens a valve releasing
cfm air compressor. The twin-cylinder construction
pressure from cylinders, and aftercooler each time
gives a higher discharge pressure with less consump-
the compressor stops. Air is exhausted outside the
tion of power. The larger cylinder is the low pressure
crankcase where moisture cannot contaminate the
cylinder and the smaller is the high pressure cylinder.
lubricant.
The low pressure, or first stage, exhausts air into the
4-23. Air Compressor Drive Pulley
intercooler which cools the air before it enters under
45 psi pressure into the high pressure cylinder. The
a. Removal.
compressor has a splash-type lubrication system.
(1) Remove the compressor drive belt guard and
drive belt (para 3-17).
The compressor is equipped with an automatic pres-
sure control which unloads when the air reservoir
(2) Remove the compressor drive pulley as il-
lustrated in figure 4-15.
pressure reaches 175 psi, and allows compression to
4-18
