BENDIX AD-IP INTEGRAL PURGE AIR DRYER manual Tests Common to More than ONE Complaint

TESTS COMMON TO MORE THAN ONE COMPLAINT

1.	Discharge plugged or restricted	•	If build-up still NOT OK or temp. above 32 deg. F, replace air
•	Connect temporary discharge line from comp. discharge port		dryer purge valve assembly.
	to supply res. & re-check build-up. If build-up OK replace	4.	Air system leakage
	plugged discharge line. If build-up NOT OK go to next cause.	•	Build system pressure to governor cut-out, wait 2 minutes for
2.	Air pressure trapped between governor and compressor		dryer purge completion. Note pressures on dash gauges
•	Verify safety valve operation then remove or disconnect		then watch dash gauges for 2 minutes. Leakage not to
	governor from compressor & check build-up.		exceed 2 psi in 2 mins. for truck, bus, tractor (no trailer).
•	If build-up OK, repair or replace governor or line between governor	•	If leakage NOT OK on gauges, find leak(s) in service and park
	and compressor.		system and repair. Retest and if system purge air dryer in use
•	If build-up NOT OK repair or replace compressor.		and still not OK repair or replace dryer.
3.	Blow Leakage at Air Dryer Exhaust	•	If leakage OK on gauges, drain air from supply reservoir,
•	Drain all air from supply reservoir then remove control air line		remove drain cock and install air gauge. Build system air in
	from air dryer, plug line and plug control port in air dryer. Re-		supply reservoir and note leakage. If OK continue checking.
	check build-up.		If NOT OK find leaks and repair.
•	If build-up OK, repair or replace governor or line between	5.	Discharge line leakage
	governor and air dryer.	•	Soap cover on flex discharge line, if leakage noted replace
•	If build-up NOT OK, and below 32 deg. F, turn ignition ON and		line.
	allow heater to warm air dryer then check build-up. If NOT OK,	•	Soap fittings to check leakage, tighten as needed.
	remove wire (connector or terminal) from air dryer. Using test
	light, check wire end or terminal for battery voltage with vehicle
	ignition ON. If voltage OK, repair or replace air dryer heater
	and thermostat. If voltage NOT OK, repair or replace the
	vehicle wire connected to air dryer. Retest build-up.

IMPORTANT: The Complaints, Causes and Remedies presented here should not be considered as the only situations possible. They are only meant to represent the most commonly encountered. It may be necessary to perform additional trouble shooting using the more detailed information presented in service manuals for the specific components.

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