TM 5-3805-280-10
The use of such a mixture is recommended for both
COMPRESSOR OIL COOLER
summer and winter operation. When using water
The compressor lubricating and cooling oil is cooled
alone, be sure to add a reputable brand of rust
by means of the fin and tube-type oil cooler, located
inhibitor to prevent internal corrosion.
beside the radiator. The lubricating and cooling oil,
flowing internally through the core section, is cooled
It is recommended to test the freezing protection of
by the air stream from the cooling fan flowing past
the coolant every six months or prior to freezing
the core section.
When grease, oil and dirt
temperatures. Replenish with a fresh mixture every
accumulate on the exterior surfaces of the oil cooler,
twelve months. A drain for the system is located in
its efficiency is impaired.
the bottom radiator tank. An alternate method
would be to disconnect a bottom radiator hose.
Each month it is recommended that the oil cooler
be cleaned by directing compressed air which
Each month, inspect the radiator exterior for
contains a nonflammable safety solvent through the
obstructions (dirt, bugs, etc.). If present, blow water
core of the oil cooler. This should remove the
or compressed air containing a nonflammable
accumulation of grease, oil and dirt from the exterior
solvent between the fins in a direction opposite the
surfaces of the oil cooler core so that the entire
normal air flow. Should the radiator be clogged
cooling area can transmit the heat of the lubricating
internally, standard automotive practices should be
and cooling oil to the air stream.
followed.
In the event foreign deposits, such as sludge and
lacquer, accumulate in the oil cooler to the extent
that its cooling efficiency is impaired, a resulting
HOSES
high discharge air temperature is likely to occur,
Each month it is recommended that all of the intake
causing shut down of the unit.
lines to and from the air cleaners, the engine cooling
system hoses and all of the flexible hoses used for
To correct this situation it will be necessary to clean
air, oil, and fuel be inspected.
it using a cleaning compound in accordance with the
manufacturer's recommendations.
Use only a
To ensure freedom from air leaks, all rubber hose
dependable cleaning compound. This is of prime
joints and the screw-type hose clamps must be
importance because different cleaners vary in
absolutely tight.
Regular inspection of these
concentration and chemical composition.
After
connections for wear or deterioration is a definite
completing the cleaning procedure, the oil cooler
"must" if regulator servicing of the air cleaners is not
must be flushed before returning to service.
to prove futile.
Premature wear of both the engine and compressor
RADIATOR
is ASSURED whenever dust-laden air is permitted
WARNING
to enter the engine's combustion chamber or the
compressor intake practically unfiltered.
Do not remove the cap from a HOT engine
The flexible hoses used in the fuel, oil and air lines
radiator. The sudden release of pressure from a
on these units are primarily used for their ability to
heated cooling system can result in a loss of
accommodate
relative
movement
between
coolant and possible severe personal injury.
components. It is extremely important they be
periodically inspected for wear and deterioration.
The engine cooling system is filled at the factory
Clamps are used to prevent hose cover abrasion
with a 50/50 mixture of water and ethylene glycol.
through vibration. This abrasion may occur when
This permanent type antifreeze contains rust
two hose lines cross, or when a hose line rubs
inhibitors and provides protection to -35 F (-37C).
against a fixed point; therefore, it is necessary that
all clamps be replaced if missing.
It is also
important the operator does not use the hoses as
convenient hand hold or steps. Such use can cause
early cover wear and hose failure.
18-4
