User's Manual

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 lter and service if
necessary (if possible, check the air 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 ltered 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 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.
(f)
(g)
Kinked discharge line shown.
Dash gauges.
Partly collapsed
inlet line shown.