User's Manual

Symptom: What it may indicate: What you should do:
22
(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 29. 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 18 for recommended size. Replace
as necessary.
 The discharge line must maintain a
constant slope down from the compres-
sor 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 fitting, 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)
(h)
4.0 Oil in Supply
or Service
Reservoir*
(air dryer installed)
(continued)
(f)
(e)
(g)
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.