Bendix Commercial Vehicle Systems TROUBLE SHOOTING COMPRESSOR - Manual (Page 10)

Symptom: What it may indicate: What you should do:
10
(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 filter and service if
necessary (if possible, check the air filter
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, fittings, gaskets, filter
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 3 for recommended
size) and go to Test 3 on page 14.
 By other restrictions (e.g. kinks). Replace
the discharge line. See Table A, column
2, on page 3 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 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-008-021
and TCH-008-022. 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.