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FIGURE 7 - AD-IS

AIR DRYER AND RESERVOIR SYSTEM DELIVERY CHECK VALVE

cut-out pressure (a 1" bubble in 10 seconds is acceptable),

the vehicle may be returned to temporary service.

Note: This is a temporary bypass of the air dryer, and

full repair of the unit must be carried out at the earliest

opportunity. With the air dryer and reservoir system

removed from the system, contaminants will be entering

the air system: reservoirs will need to be manually drained

daily until the repairs are completed. At end of each working

day, park vehicle and slowly drain pressure through the

drain valves – leave open to the atmosphere, for several

hours if possible. When repairs are carried out, be sure to

check that all reservoirs (including the air dryer purge

reservoir) are emptied of all contaminants.

If after bypassing the air dryer and reservoir system the

system pressure still does not build, use the following

procedure to remove, clean and reinstall the delivery check

valve.

DELIVERY CHECK VALVE CLEANING PROCEDURE

(Note: This is only required if system pressure does not

build after temporary bypass is completed.)

SMALL

O-RING

CHECK VALVE

BODY

SPRING

GOVERNOR GASKET

(SPECIAL GASKET,

SEE NOTE 6)

LARGE

O-RING

ADAPTER

See Figure 7 throughout this procedure. Depressurize the

air brake system following the general safety precautions

outlined elsewhere in this document. Also, always

depressurize the air dryer purge reservoir before servicing

the air dryer.

This procedure does not require removal of the AD-IS

dryer and reservoir system from the vehicle.

1. Remove the line from the governor and mark for easy

reinstallation.

2. Remove the bolts attaching the governor to the AD-IS

air dryer and reservoir system and retain for reassembly.

3. Remove the governor from the air dryer. Be aware that a

short puff of trapped air may vent when the governor is

removed. Retain the governor gasket for reassembly if

a new governor gasket is not available. Remove and

retain the o-ring from the adapter.

4. The spring/delivery check valve can now be removed.

5. Remove and retain the o-ring from check valve body.

GOVERNOR

(NON-ADJUSTABLE,

130 PSI CUT-OUT)

BOLTS

air