Specifications

11
mating engine surfaces are unobstructed
and aligned. Special care must be taken
when sealants are used with, or instead
of, gaskets.
C. Check for damaged, defective or dirty air
filter on engine or compressor. Check for
leaking, damaged or defective
compressor air intake components (e.g.,
induction line, fittings, gaskets, filter
bodies, etc). The compressor intake
should not be connected to any part of the
exhaust gas recirculation (E.G.R.) system
on the engine.
D. For air-cooled compressor or air-cooled
portions of the compressor:
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.
3. Air-cooled compressors should not be
used on engines equipped with fan clutches.
For water-cooled compressor or water
cooled portions of the compressor:
1 . Check for proper coolant line sizes.
Minimum recommended size is 1/2" O.D.
tubing.
2. Check the coolant flow through the
compressor. Minimum allowable flow is 2.5
gallons per minute at engine governed
speed. If low coolant flow is detected,
inspect the coolant lines and fittings for
accumulated rust scale, kinks and
restrictions.
3. Water temperature should not exceed
200°F.
4. Optimum cooling is achieved when
engine coolant flows into the com ` pressor
cylinder block at one end and out the
compressor cylinder head at the opposite
end.
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 and replace or repair crankcase
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" O.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
SYMPTOMS CAUSE REMEDY
C. Poorly filtered inlet air.
D. Insufficient compressor
cooling (compressor runs
hot).
E. Contaminants not being
regularly drained from
system reservoirs.
F. Compressor runs loaded
an excessive amount of
time.
G. Excessive engine
crankcase pressure.
H. Excessive engine oil
pressure.
I. Faulty compressor.
A. Loose drive gear or pulley.
2. Noisy compressor operation.