A-7
Symptom: What it may indicate: What you should do:
(e) Air compressor discharge and/or
air dryer inlet temperature too
high.
(f) Insuffi cient coolant fl ow.
(g) Restricted discharge line.
Check temperature as outlined in Test 3 on
page A-14. If temperatures are normal go
to 4.0(h).
Inspect coolant line. Replace as necessary
(I.D. is 1/2").
Inspect the coolant lines for kinks and
restrictions and fi ttings for restrictions.
Replace as necessary.
Verify coolant lines go from engine block to
compressor and back to the water pump.
Repair as necessary.
If discharge line is restricted or more than
1/16" carbon build-up is found, replace the
discharge line. See Table A, column 2, on
page A-3 for recommended size. Replace
as necessary.
The discharge line must maintain a
constant slope down from the compressor
to the air dryer inlet fi tting to avoid low points
where ice may form and block the fl ow.
If, instead, ice blockages occur at the air
dryer inlet, insulation may be added here,
or if the inlet fi tting is a typical 90 degree
fi tting, it may be changed to a straight or
45 degree fi tting. For more information on
how to help prevent discharge line freeze-
ups, see Bendix Bulletins TCH-08-21
and TCH-08-22 (Appendix B). Shorter
discharge line lengths or insulation may be
required in cold climates.
Temperature
Other
Check compressor air inlet line for restric-
tions, brittleness, soft or sagging hose
conditions etc. Repair as necessary. Inlet
line size is 3/4 ID. Maximum restriction
requirement for compressors is 25 inches
of water.
Check the engine air fi lter and service if
necessary (if possible, check the air fi lter
usage indicator).
(h) Restricted air inlet (not enough air
to compressor).
(g)
4.0 Oil in Supply
or Service
Reservoir*
(air dryer installed)
(continued)
Kinked discharge line shown.
Partly
collapsed
inlet line
shown.
Testing the temperature
at the discharge fi tting.
Inspecting the coolant hoses.
*If a maintained Bendix
®
PuraGuard
®
system fi lter or Bendix
®
PuraGuard QC
™
oil coalescing
fi lter is installed, call 1-800-AIR-BRAKE (1-800-247-2725) and speak to a Tech Team member.
(g)
(e)
(f)
(h)
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