BENDIX TU-FLO 550 COMPRESSOR Manual page 27

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 A-15.
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 A-3 for recommended
size) and go to Test 3 on page A-14.
By other restrictions (e.g. kinks).
Replace the discharge line. See Table A,
column 2, on page A-3 for recommended
size.
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.
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 A-15.
Go to Test 4 on page A-15.
A-11