25
A-7
Symptom:
What it may indicate:
What you should do:
(e) Air compressor discharge and/or
air dryer inlet temperature too
high.
(f) Insufficient coolant flow.
(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 the coolant line. Replace as
necessary (I.D. is 1/2").
Inspect the coolant lines for kinks and
restrictions and fittings 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 fitting to avoid low points
where ice may form and block the flow. If,
instead, ice blockages occur at the air dryer
inlet, insulation may be added here, or if
the inlet fitting is a typical 90° fitting, it may
be changed to a straight or 45° fitting. For
more information on how to help prevent
discharge line freeze-ups, see Bendix
Bulletins TCH-008-021 and TCH-008-022
(Appendix B). Shorter discharge line
lengths or insulation may be required in
cold climates.
Temperature
Other
Check the compressor air inlet line for
restrictions, brittleness, soft or sagging
hose conditions etc. Repair as necessary.
Inlet line size is 3/4 I.D. Maximum restriction
requirement for compressors is 25 inches
of water.
Check the engine air filter and service if
necessary (if possible, check the air filter
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 fitting.
Inspecting the coolant hoses.
*If a maintained Bendix
®
PuraGuard
®
system filter or Bendix
®
PuraGuard QC
™
oil coalescing
filter is installed, call 1-800-AIR-BRAKE (1-800-247-2725), option 2, and speak to a Tech Team
member.
(g)
(e)
(f)
(h)
