Specifications

13
BW1421 © 2002 Bendix Commercial Vehicle Systems LLC All rights reserved. 3/2002 Printed in U.S.A
and plungers and inspect their bores in the
cylinder block. Clean lubricate as
necessary. Inspect for bent, kinked or
blocked tubing leading to or from the
governor.
G. Replace or repair the compressor after
determining none of the preceding
installation defects exist.
A. Test the governor for proper operation and
inspect air lines to and from the governor for
kinks or restrictions. Replace or repair the
governor or its connecting air lines.
B. Inspect for worn, dirty or corroded unloader
pistons and their cylinder block bores.
Replace as necessary.
A. Check the compressor mounting bolt
torque. If the mounting bolt torque is low,
replace the compressor mounting gasket
before retorquing the mounting bolts.
B. Visually inspect the compressor exterior for
cracked or broken components. Cracked or
broken crankcases or mounting flanges
can be caused by loose mounting bolts.
The end cover can be cracked by over
torquing fitting or plugs installed in the end
cover. Replace or repair the compressor as
necessary.
C. Check the cap screw torques and tighten as
necessary.
D. Check the torque of external oil line fittings
and tighten as necessary.
E. Replace the compressor if porosity is
found.
F. Replace as necessary.
A. Remove the compressor inlet air strainer or
fitting. With the compressor unloaded (not
compressing air), check for air leakage
around the unloader pistons. Replace as
necessary.
B. Test the governor for proper operation and
repair or replace as necessary.
C. Test for excessive system leakage as
instructed in Symptom 3, Remedy E.
Reduce leakage wherever possible.
D. Drain reservoirs. contaminants.
A. Check torque of fittings and plugs and
tighten as necessary. Over-torque fittings
and plugs can crack the head or block
casting.
B. Test anti-freeze and strengthen as improper
anti-freeze necessary. Check coolant flow
through compressor to assure the proper
anti-freeze mixture reaches the compressor.
C. If casting porosity is detected, replace the
compressor.
A. Clear restriction or replace line.
B. Tighten evenly to a torque of 25-30 foot
pounds.
C. Check for rough or poorly machined head or
block surfaces. Replace necessary
components.
SYMPTOMS CAUSE REMEDY
G. Faulty compressor.
A. Faulty governor or
governor installation.
B. Faulty or worn unloader
pistons or bores.
A. Damaged mounting
gasket.
B. Cracked crankcase,
cylinder block or end
cover.
C. Loose end cover or
cylinder block cap screws.
D. Loose oil supply or return
line fittings.
E. Porous compressor
casting.
F. Mounting flange or end
cover, O-Ring or
gasketmissing, cut, or
damaged.
A. Leaking compressor
unloader pistons.
B. Faulty governor.
C. Excessive system
leakage.
D. Excessive reservoir
contaminants.
A. Improperly installed plugs
and coolant line fittings.
B. Freeze cracks due to
improper anti-freeze
strength.
C. Faulty compressor
(porous castings).
A. Restricted discharge line.
B. Loose head bolts.
C. Faulty compressor or
head gasket.
4. Compressor fails to unload.
5. Compressor leaks oil.
6. Compressor constantly cycles
(compressor remains unloaded for a
very short time.)
7. Compressor leaks coolant.
8. Compressor head gasket failure.