BENDIX SD-08-2414 manual Column, Refer to Appendix A, Table a columns 3 & 4 for

BENDIX® AD-IP®AIR DRYER TROUBLESHOOTING CHART

SYMPTOMS	CAUSE		REMEDY
2. Water and/or oil in	G. Compressor malfunction.		G. If you found excessive oil present in the service
the supply or service				reservoir and you did not find any issues above,
reservoir (continued).				the compressor may be passing oil. Test the
				compressor using the Bendix® BASIC™ cup method
				as described in the Bendix compressor service
				manual and referred to in Appendix A, Table A,
				column 5.
				Replace compressor. If still under warranty, follow
				normal warranty process.
	H. Air by-passes desiccant		H. If the vehicle uses a Holset® compressor, inspect
		cartridge assembly.		the feedback check valve for proper installation and
				operation. When replacing the desiccant cartridge,
				make sure the desiccant cartridge assembly is
				properly installed and the sealing rings are in place
				on the mounting surface of the desiccant cartridge.
	I.	Desiccant requires	I.	Replace the desiccant cartridge assembly.
		replacement.		Refer to Appendix A, Table A columns 3 & 4 for
				recommended intervals.
3. Oil present at the air	A. Air brake charging system is		A. Air dryers remove water and oil from the air brake
dryer purge exhaust		functioning normally.		charging system. A small amount of oil is normal.
or cartridge during				Check that the regular maintenance is being
maintenance.				performed and that the amount of oil in the air tanks
				(reservoirs) is within the acceptable range shown on
				the BASIC cup (see also column 5 of Appendix A,
				Table A). Replace the air dryer cartridge as needed
				and return the vehicle to service.
			B. The Bendix® AD-IP®PuraGuard® oil coalescing air
				dryer removes more oil from the brake system than
				the standard Bendix® AD-IP®air dryer.
4. Safety valve on the air	A. Restriction between air dryer		A. Check to determine if air is reaching the supply
dryer “popping off” or		and supply (first) reservoir.		reservoir. Inspect for kinked tubing or hose. Check
exhausting air.				for undrilled or restricted hose or tubing fittings and
				repair or replace as needed.
	B. Air dryer safety valve		B. Verify the relief pressure is at the vehicle or
		malfunction.		component manufacturer specifications. Replace
				if malfunctioning.
	C. Desiccant cartridge		C. Refer to Table A and column 3. Check the
		maintenance required.		compressor for excessive oil passing and/or correct
				compressor installation. Repair or replace as
				necessary. Replace the desiccant cartridge.
	D. Malfunctioning discharge		D. Test to determine if air is passing through the check
		check valve in the end cover		valve. Repair or replace.
		of the AD-IP air dryer.
	E. Excessive pressure		E. Increase the volume in the discharge line by
		pulsations from the		increasing the length or diameter. Add a ping tank
		compressor. (Typical single		(small reservoir).
		cylinder type.).
	F.	Governor malfunction.	F.	Test the governor operation and/or inspect the
		Missing or restricted		control line leading from the governor UNL
		governor control line		(unloader) port to the air dryer control port.
		installation.

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