User's Manual
Symptom: What it may indicate: What you should do:
25
(g) Restricted air inlet (not enough air
to compressor).
Check compressor air inlet line for
restrictions, brittleness, soft or sagging
hose conditions, etc. Repair as necessary.
Refer to vehicle manufacturer’s guidelines
for inlet line size.
Check the engine air fi lter and service if
necessary (if possible, check the air fi lter
usage indicator).
(i) Compressor malfunction.
Replace the compressor only after making
certain that none of the preceding conditions,
9.0 (a) through 9.0 (h), exist.
(h)Poorly filtered inlet air (poor air
quality to compressor).
Check for leaking, damaged or defective
compressor air inlet components (e.g.
induction line, fi ttings, gaskets, fi lter bodies,
etc.). Repair inlet components as needed.
Note: Dirt ingestion will damage compressor
and is not covered under warranty.
9.0 Air brake
charging system
seems slow to
build pressure.
(continued)
(f) Restricted discharge line.
If discharge line is restricted:
By more than 1/16" carbon build up,
replace the discharge line (see Table A,
column 2, on page 18 for recommended
size) and go to Test 3 on page 29.
By other restrictions (e.g. kinks).
Replace the discharge line. See Table A,
column 2, on page 18 for recommended
size. Retest for air build. Return vehicle to
service or, if problem persists, go to 9.0(a).
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-008-021
and TCH-008-022 (Appendix B). Shorter
discharge line lengths or insulation may be
required in cold climates.
(f)
(g)
Kinked discharge line shown.
Dash gauges.
Partly collapsed
inlet line shown.