Symptom: | What it may indicate: | What you should do: |
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9.0Air brake charging system seems slow to build pressure. (continued)
Dash gauges.
(f) Restricted discharge line.
(f)
Kinked discharge line shown.
ðIf discharge line is restricted:
ðBy 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.
ðBy 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).
ðThe 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
(g)
Partly collapsed inlet line shown.
(g)Restricted air inlet (not enough air to compressor).
(h)Poorly filtered inlet air (poor air quality to compressor).
ðCheck 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.
ðCheck the engine air filter and service if necessary (if possible, check the air filter usage indicator).
ðCheck 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.
(i)Compressor malfunction.ð Replace the compressor only after making certain that none of the preceding
conditions, 9.0 (a) through 9.0 (h), exist.
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