BENDIX BA-922 COMPRESSOR Manual page 21

Symptom:
10.0 Air charging
system doesn't
build air.
* Note: For the Bendix
the governor, but also the SV-1
need to be tested. See Bulletin TCH-001-048.
(a) Restricted discharge line.
11.0 Compressor
safety valve
releases air
(Compressor
builds too much
air).
(b) Downstream air brake system check
(c) Air dryer lines incorrectly installed.
(d) Compressor safety valve
(e) Compressor unloader mechanism
(f) Governor malfunction.
What it may indicate:
(a) Governor malfunction*.
(b) Restricted discharge line.
(c) Air dryer heater malfunction:
exhaust port frozen open.
(d) Compressor malfunction.
DuraFlo 596 air compressor, not only
® ™
synchro valve used would
™
Damaged
discharge
line shown.
valves or lines may be blocked or
damaged.
malfunction.
malfunction.
What you should do:
 Go to Test 4 on page 25.
 See 9.0(f).
 Replace air dryer heater.
 Replace the compressor only after making
certain the preceding conditions do not
exist.
 If discharge line is restricted:
By more than 1/16" carbon build up,

replace the discharge line (see Table A,
column 2, on page 13 for recommended
size) and go to Test 3 on page 24.
By other restrictions (e.g. kinks).

Replace the discharge line. See Table A,
column 2, on page 13 for recommended
size.
 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 degree
fitting, it may be changed to a straight or
45 degree fitting. 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.
 Inspect air lines and verify check valves are
operating properly.
 Ensure discharge line is installed into the
inlet of the air dryer and delivery is routed
to the service reservoir.
 Verify relief pressure is 250 psi. Replace if
defective.
 Go to Test 6 on page 25.
 Go to Test 4 on page 25.
21