TM 5-3805-263-14&P-3
SYMPTOMS
CAUSE
REMEDY
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.
2. Noisy compressor operations
A. Loose drive gear or pulley
A.
Inspect the fit of the drive gear on pulley on
the compressor crankshaft. The pulley on
gear must be completely seated and the
crankshaft nut must be tight. If the
compressor crankshaft surface or its keyway
are damaged, it is an indication of loose
drive components. If damage to the
compressor crankshaft is detected, replace
the compressor or the crankshaft. When in-
stalling the drive gear or pulley, torque the
crankshaft nut to 100 foot pounds.
CAUTION
DO NOT BACK OFF THE CRANKSHAFT
NUT TO ALIGN THE COTTER PIN AND
CASTELLATED NUT.(Some compressors
do not use castellated nuts.) DO NOT
USE IMPACT WRENCHES.
B. Excessively worn drive
B.
Inspect drive gear and couplings and engine
for excessive wear. Replace as necessary.
(Non-metallic gears should be replaced
when the compressor is changed.)
C. Compressor cylinder head or
C.
Inspect the compressor discharge port and
discharge line restrictions
discharge line for carbon build-up. If carbon
is detected, check for proper cooling to the
compressor. (See Cause and Remedy (D)
under Symptom #1.) Inspect the discharge
line for kinks and restrictions. Replace
discharge line as necessary.
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