TM 5-3825-226-24
SYMPTOMS
CAUSE
REMEDY
C. Poorly filtered inlet air.
C. Check for damaged, defective or dirty air filter
on engine. Check for leaking, damaged or
defective compressor air intake components
(i.e., induction line, fittings, gaskets, filter
bodies, etc).
D. Insufficient compressor
cooling (compressor runs
D. For air-cooled portions of the compressor:
hot).
1. Remove accumulated grease, grime, or
dirt from the cooling fins. Replace
components found damaged.
2. Check for damaged cooling fins. Replace
components found damaged.
E. Contaminants not being
E. Check reservoir drain valves to insure that
regularly drained from
they are functioning properly. It is recom-
system reservoirs.
mended that the vehicle should be equipped
with functioning automatic drain valves, or
have all reservoirs drained to zero (0) psi
daily, or optimally to be equipped with a
desiccant-type air dryer prior to the reservoir
system.
F. Compressor runs loaded an
F. Vehicle system leakage should not exceed
excessive amount of time. industry standards of 1 psi pressure drop
per minute without brakes applied, and 3
psi pressure drop per minute with brakes
applied. If leakage is excessive, check for
system leaks and repair.
G. Excessive engine crankcase
G. Test for excessive engine crankcase
pressure.
pressure and replace or repair crankcase
ventilation components as necessary. (An
indication of crankcase pressure is a loose
or partially lifted dipstick.)
H. Excessive engine oil
H. Check the engine oil pressure with a test
pressure.
gauge and compare the reading to the
engine specifications. Bendix does not
recommend restricting the compressor oil
supply line because of the possibility of
plugging the restriction with oil
contaminants. Minimum oil supply line size
is 1/4" O.D. tubing.
I.
Faulty compressor.
I.
Replace or repair the compressor only after
making certain none of the preceding
installation defects exist.
31. Noisy compressor operations.
A. Loose pulley.
A. Inspect the fit of pulley on the compressor crank-
shaft. The pulley must be completely seated and
the crankshaft nut must be tight. If the com-
pressor crankshaft surface or its keyway are
damaged, it is an indication of loose drive com-
ponents. If damage to the compressor crankshaft
is detected, replace the compressor or the crank-
shaft. When installing pulley, torque the crankshaft
nut to 100 foot pounds. DO NOT BACK OFF
THE CRANKSHAFT NUT TO ALIGN THE
COTTER PIN AND CASTELLATED NUT. DO
NOT USE IMPACT WRENCHES.
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