Specifications

16
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COMPRESSOR TROUBLESHOOTING CHART (Continued)
SYMPTOMS
C. Excessive system
leakage.
CAUSE
REMEDY
F. Replace as necessary.
A. Remove the compressor inlet air strainer or
fitting. With the compressor unloaded (not
compressing air), check for air leakage.
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.
A. Check torque of fittings and plugs and tighten
as necessary. Overtorqued fittings and plugs
can crack the head or block casting.
B. Test antifreeze and strengthen as necessary.
Check coolant flow through compressor to
assure the proper antifreeze 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.
7. Compressor leaks
coolant.
D. Excessive reservoir
contaminants.
A. Improperly installed
plugs and coolant line
fittings.
B. Freeze cracks due to
improper antifreeze
strength.
C. Faulty compressor
(porous castings).
8. Compressor head
gasket failure.
A. Restricted discharge
line.
B. Loose head bolts.
C. Faulty compressor or
head gasket.
F. Mounting flange or end
cover, o-ring or gasket -
missing, cut or
damaged.
A. Leaking compressor
unloader pistons.
6. Compressor constantly
cycles (compressor
remains unloaded for
a very short time).
B. Faulty Governor.
5. (Continued)
BW1422 © Honeywell Commercial Vehicle Systems Company. 1/1999 Printed in U.S.A.