Preventive Maintenance

DESICCANT
BED
OIL			SPRING
OIL
SEPARATOR
	DESICCANT
	CARTRIDGE
PURGE
ORIFICE
	PURGE		PIPE PLUG
	PURGE
CONTROL	VOLUME
PORT
SUPPLY	CHECK
SUPPLY	VALVE
PORT	VALVE
PORT	(BLACK)
	(BLACK)
TURBO			DELIVERY
CUTOFF			PORT
VALVE		CARTRIDGE	O-RING
PURGE		CARTRIDGE
PURGE		BOLT	CHECK VALVE
VALVE	DELIVERY	BOLT	CHECK VALVE
CARTRIDGE	DELIVERY		(WHITE)
CARTRIDGE	PORT		(WHITE)
BOLT	PORT
BOLT
Old Style End Cover -Vertical Delivery Check Valve		New Style End Cover - Horizontal Delivery Check Valve

FIGURE 7 - AD-IP™AIR DRYER SECTIONAL VIEW

connected to the engine turbocharger. The turbo cutoff valve also removes the “puffing” of air out the open purge exhaust when a naturally aspirated, single cylinder compressor, equipped with an inlet check valve, is in use.

At the onset of the purge cycle, the downward travel of the purge piston is stopped when the turbo cutoff valve (tapered portion of purge piston) contacts its mating metal seat in the purge valve housing. With the turbo cutoff valve seated (closed position), air in the compressor discharge line and AD-IP™air dryer inlet port cannot enter the air dryer. In this manner the turbo cutoff effectively maintains turbocharger boost pressure to the engine.

Important: Review the warranty policy before performing any intrusive maintenance procedures. An extended warranty may be voided if intrusive maintenance is performed during this period. Note: It is acceptable for the purge valve to be maintained as necessary, i.e., the installation of a purge valve maintenance kit, without voiding the warranty.

Because no two vehicles operate under identical conditions, maintenance and maintenance intervals will vary. Experience is a valuable guide in determining the best maintenance interval for any one particular operation.

Every 900 operating hours, or 25,000 miles or three (3) months:

1.Check for moisture in the air brake system by opening reservoirs, drain cocks, or drain valves and checking for presence of water. If moisture is present, the desiccant cartridge may require replacement; however, the following conditions can also cause water accumulation and should be considered before replacing the desiccant:

A.An outside air source has been used to charge the system. This air does not pass through the drying bed.

B.Air usage is exceptionally high and not normal for a highway vehicle.

This may be due to accessory air demands or some unusual air requirement that does not allow the com- pressor to load and unload (compressing and non-compressing cycle) in a normal fashion. Check for high air system leakage. If the vehicle vocation has changed it may be necessary to upgrade the compressor size. Refer to Appendix A, Table A and the column entitled Vehicle Vocation.

C.The air dryer has been installed in a system that has been previously used without an air dryer. The system will be saturated with moisture and several weeks of operation may be required to dry it out.