TM 3-1040-26334
air, The moisture-entrained compressed air in the water
pulsations in the compressed air. A drain valve, located
separator is directed from the separator inlet port to the
at the bottom of the water separator, is used to vent the
separator baffle. The compressed airflow is deflected
collected moisture. Excessive interstage or pneumatic
causing the entrained moisture to form on the baffles
system pressure is relieved to the atmosphere through
and interior walls of the separator shell and collect at the
the second stage relief valve and the high-pressure
bottom of the water separator. Additionally, the water
water separator relief valve.
separator acts as a ballast tank, smoothing out
Section II. LUBRICATING SYSTEM
the oil through the crankshaft to components being
2-3.
General
lubricated. A spring-loaded, oil-bypass relief valve is
located in the oil pump. The valve permits the oil to
This section describes the lubricating system of the AN-
bypass the oil pump from the oil pump inlet to the oil
M4D compressor.
pump outlet passage in case of oil over-pressurization.
During compressor operation, blowby air consists of
2-4.
Functional Description
compressed air that has leaked from the compression
stages past the piston and plungers into the crankcase
The AN-M4D compressor lubricating system provides
area. In the crankcase, the blowby air is routed into a
lubricating oil to its moving parts to permit continuous
crankshaft passage which directs the blowby air at a low-
operation. The compressor is lubricated by a gerotor
flow rate to the drive end of the crankcase. A blowby
type oil pump, which is installed on the compressor
port, located in the compressor to-engine adapter, vents
crankcase next to the fan (fig. 2-2). The oil pump draws
blowby
air
to
the
atmosphere.
filtered oil from the compressor oil sump, and discharges
2-3
