BENDIX SD-08-2412 manual Bendix AD-9AND AD-9IPC AIR Dryer Troubleshooting Chart

Bendix® AD-9®AND AD-9®IPC AIR DRYER TROUBLESHOOTING CHART

SYMPTOMS	CAUSE	REMEDY
2. Water and/or Oil in Supply	(Continued)	Purge Cycle Time - During normal vehicle operation, the
o r S e r v i c e R e s e r v o i r		air compressor must remain unloaded for a minimum of 20
(continued).		seconds for the standard Bendix® AD-9®and AD-9®IPC air
		dryer or 30 seconds for the extended purge model. These
		minimum purge times are required to ensure complete
		regeneration of the desiccant material. If the purge time is
		consistently less than the minimum, an accessory by-pass
		system must be installed. Consult your local authorized Bendix
		parts outlet or sales representative for additional information.
		European Air Brake Systems - Brake systems that incorporate
		compressors without integral unloading mechanisms and/
		or utilize a compressor discharge line unloader valve have
		special air dryer installation requirements. Consult your local
		authorized Bendix parts outlet or sales representative for
		additional information.
		Air Compressor Size - Although the AD-9 and AD-9
		IPC air dryers can be used in conjunction with larger
		compressors, it was designed primarily for units rated for
		up to 17 CFM. It is recommended that when using the
		AD-9 or AD-9 IPC air dryer with a compressor which has a
		rated displacement exceeding 17 CFM that an authorized
		Bendix parts outlet or Bendix marketing representative
		be contacted for assistance.
	G. Air compressor discharge and/or	G. Restricted discharge line. See Appendix A, Table A, column 1
	air dryer inlet temperature too high.	& 2 for recommended sizes. If discharge line is restricted or
		more than 1/16” carbon build up is found, replace the discharge
		line. Replace as necessary.
		Discharge Line Freeze-Up. 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.
		Insufficient coolant flow through compressor. Inspect coolant line.
		Replace as necessary (I.D. is 1/2” min.). Inspect the coolant lines
		for kinks and restrictions and fittings for restrictions. Replace as
		necessary. Verify coolant lines go from engine block to compressor
		and back to the water pump. Repair as necessary.
		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. Inlet line size is 3/4 ID.
		Maximum restriction requirement for compressors is 25 inches
		of water. Check the engine air filter and service if necessary (if
		possible, check the air filter usage indicator).

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