BENDIX SD-08-2414 manual Bendix AD-IPAIR Dryer Troubleshooting Chart

BENDIX® AD-IP®AIR DRYER TROUBLESHOOTING CHART

SYMPTOMS	CAUSE	REMEDY
1. Air dryer is constantly	A. Excessive system leakage.	6. With a gauge installed at the RES port of the
“cycling” or purging.	IMPORTANT: Note whether	governor, pressure should not drop below the “cut-in”
Air dryer purges	air pressure loss is shown	pressure at the onset of the compressor “unloaded”
frequently (every four	on dash gauge(s). Pressure	cycle. If the pressure drops, check for “kinks” or
(4) minutes, or less,	loss SHOWN on gauges	restrictions in the line connected to the RES port.
		The line connected to the RES port on governor must
while vehicle is idling)	is caused by service brake
		be the same diameter or preferably larger than the
(continued).	system or component
		lines connected to UNL port(s) on governor.
	leakage. Pressure loss
	NOT SHOWN on gauges is
	caused by supply system
	or component leakage.
	(continued)
	B. Holset® “E” type compressor.	B. Test the Holset® E Compressor unloader system
		with a feedback line and check valve for proper
		operation. Make certain the Holset ECON is not in
		use with the drop-in version of the air dryer, if so,
		remove and retest.
		When installing a Bendix® Drop-In air dryer in a system
		equipped with a Holset E or QE compressor, remove
		the Holset ECON valve along with its feedback and
		governor control line.

Check Valve

Feedback Line

Typical Drop-In Air Dryer End Cover

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