User's Manual

7
Symptom: What it may indicate: What you should do:
(e) Air compressor discharge and/
or air dryer inlet temperature too
high.
(f) Insufcient coolant ow.
(g) Restricted discharge line.
Check temperature as outlined in Test 3 on
page 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 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 3 for recommended size. Replace as
necessary.
The discharge line must maintain a
constant slope down from the compressor
to the air dryer inlet tting to avoid low points
where ice may form and block the ow.
If, instead, ice blockages occur at the air
dryer inlet, insulation may be added here,
or if the inlet tting is a typical 90 degree
tting, it may be changed to a straight or
45 degree tting. For more information on
how to help prevent discharge line freeze-
ups, see Bendix Bulletins TCH-008-021
and TCH-008-022. Shorter discharge line
lengths or insulation may be required in cold
climates.
Temperature
Other
Check compressor air inlet line for
restrictions, 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 lter and service if
necessary (if possible, check the air 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 tting.
Inspecting the coolant hoses.
*If a maintained Bendix
®
PuraGuard
®
system lter or Bendix
®
PuraGuard
®
oil coalescing lter is
installed, call 1-800-AIR-BRAKE (1-800-247-2725) option 2 and speak to a Tech Team member.