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Book 54722160 (8/02)
COMPRESSOR OIL COOLER
The compressor lubricating and cooling oil is cooled
by means of the fin and tube--type oil cooler, located
beside the radiator. The lubricating and cooling oil,
flowing internally through the core section, is cooled by
the air stream from the cooling fan flowing past the
core section. When grease, oil and dirt accumulate on
the exterior surfaces of the oil cooler, its efficiency is
impaired.
Each month it is recommended that the oil cooler be
cleaned by directing compressed air which contains a
nonflammable safety solvent through the core of the
oil cooler. This should remove the accumulation of
grease, oil and dirt from the exterior surfaces of the oil
cooler core so that the entire cooling area can transmit
the heat of the lubricating and cooling oil to the air
stream.
In the event foreign deposits, such as sludge and lac-
quer, accumulate in the oil cooler to the extent that its
cooling efficiency is impaired, a resulting high dis-
charge air temperature is likely to occur, causing shut
down of the unit.
To correct this situation it will be necessary to clean it
using a cleaning compound in accordance with the
manufacturer’s recommendations. Use only a de-
pendable cleaning compound. This is of prime impor-
tance because different cleaners vary in concentration
and chemical composition.
After completing the
cleaning procedure, the oil cooler must be flushed be-
fore returning to service.
RADIATOR
WARNING
Do not remove the cap from a HOT engine radiator.
The sudden release of pressure from a heated
cooling system can result in a loss of coolant and
possible severe personal injury.
The engine cooling system is filled at the factory with a
50/50 mixture of water and ethylene glycol. This per-
manent type antifreeze contains rust inhibitors and
provides protection to --35
°
F (--37
°
C).
The use of such a mixture is recommended for both
summer and winter operation. When using water
alone, be sure to add a reputable brand of rust inhibitor
to prevent internal corrosion.
It is recommended to test the freezing protection of the
coolant every six months or prior to freezing tempera-
tures. Replenish with a fresh mixture every twelve
months. A drain for the system is located in the bottom
radiator tank. An alternate method would be to discon-
nect a bottom radiator hose.
Each month, inspect the radiator exterior for obstruc-
tions (dirt, bugs, etc.). If present, blow water or com-
pressed air containing a nonflammable solvent be-
tween the fins in a direction opposite the normal air
flow. Should the radiator be clogged internally, stan-
dard automotive practices should be followed.
HOSES
Each month it is recommended that all of the intake
lines to and from the air cleaners, the engine cooling
system hoses and all of the flexible hoses used for air,
oil, and fuel be inspected.
To ensure freedom from air leaks, all rubber hose
joints and the screw--type hose clamps must be abso-
lutely tight. Regular inspection of these connections
for wear or deterioration is a definite “must” if regulator
servicing of the air cleaners is not to prove futile.
Premature wear of both the engine and compressor is
ASSURED whenever dust--laden air is permitted to
enter the engine’s combustion chamber or the com-
pressor intake practically unfiltered.
The flexible hoses used in the fuel, oil and air lines on
these units are primarily used for their ability to accom-
modate relative movement between components. It is
extremely important they be periodically inspected for
wear and deterioration. Clamps are used to prevent
hose cover abrasion through vibration. This abrasion
may occur when two hose lines cross, or when a hose
line rubs against a fixed point; therefore, it is necessary
that all clamps be replaced if missing. It is also impor-
tant the operator does not use the hoses as conve-
nient hand hold or steps. Such use can cause early
cover wear and hose failure.
