Specifications
13
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COMPRESSOR TROUBLESHOOTING CHART (Continued)
SYMPTOMS
E. Check reservoir drain valves to insure that they
are functioning properly. It is recommended
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. Vehicle system leakage should not exceed
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. Test for excessive engine crankcase pressure
& replace or repair ventilation components as
necessary. (An indication of crankcase
pressure is a loose or partially lifted dipstick.)
H. Check the engine oil pressure with a test 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" I.D. tubing.
I. Replace or repair the compressor only after
making certain none of the preceding
installation defects exist.
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. When
installing the drive gear or pulley, torque the
crankshaft nut to the appropriate torque
specifications. 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.
E. Contaminants not being
regularly drained from
system reservoirs.
CAUSE
REMEDY
I. Faulty compressor.
F. Compressor runs loaded
an excessive amount of
time.
G. Excessive engine
crankcase pressure.
H. Excessive engine oil
pressure.
A. Loose drive gear or
pulley.
2. Noisy compressor
operations.
1. (Continued)