BENDIX BW1948 manual DRM/AD-ISAIR Dryer Troubleshooting Chart

DRM™/AD-IS®AIR DRYER TROUBLESHOOTING CHART (Continued)

	SYMPTOMS	CAUSE	REMEDY
5. Can not build system		A. Kinked or blocked	A. Check to determine if air passes through
		(plugged) discharge line.	discharge line. Check for kinks, bends,
	air pressure.
			excessive carbon deposits, or ice blockage.
		B. Excessive bends in	B. Discharge line should be constantly sloping from
		discharge line (water	compressor to air dryer with as few bends as
		collects and freezes).	possible.
		C. Pressure protection	C. Replace air dryer (pressure protection valves are
		valve(s) in air dryer will	not serviceable).
		not open.
		D. Refer to Symptom 4.	D. Refer to Symptom 4, Remedy A.
		E. Refer to Symptom 7.	E. Refer to Symptom 7, Remedies A through D.
6. Air dryer does not purge		A. Faulty air dryer purge	A. After determining air reaches purge valve control
	or exhaust air.	valve.	port by installing a T-fitting with a pressure
			gauge into the governor unloader port, repair
			purge valve if necessary.
		B. See Causes, B, E, and	B. Refer to Symptom 4, Remedies B, E, and G.
		G for Symptom #4.	Also refer to Symptom 1, Remedy B.
7.	Desiccant material	A. Faulty dryer cartridge.	A. Replace AD-IS®air dryer cartridge and/or
	being expelled from air		AD-IS®air dryer.
	dryer purge valve
		B. Excessive dryer vibration.	B. Check reservoir mounting for looseness or
	exhaust (may look like
	whitish liquid or paste		damage. Repair mounting and replace cartridge.
	or small beads.)
8.	Unsatisfactory	A. Excessive system	A. Refer to Symptom 1, Remedy A.
	desiccant life.	leakage.
		B. Wrong vehicle application	B. Refer to Symptom 2, Remedy C.
		for AD-IS®air dryer.
		C. Compressor passing	C. Check for proper compressor installation; if
		excessive oil.	symptoms persist, replace compressor. Refer to
			Bendix Advanced Troubleshooting Guide for Air
			Brake Compressors (BW1971).
9.	“Pinging” noise	A. Single cylinder	A. A slight “pinging” sound may be heard during
	excessive during	compressor with high	system build up when a single cylinder
	compressor loaded	pulse cycles.	compressor is used. If this sound is deemed
	cycle.		objectionable, it can be reduced substantially by
			increasing the discharge line volume.
			This can be accomplished by adding a 90 cubic
			inch reservoir between the compressor and the
			AD-IS®air dryer.

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