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If, after completing the routine operation and leakage tests,

it has been determined that one or more components of the

air dryer and reservoir system requires replacement or

maintenance, refer to the following list to find the appropriate

kit(s).

MAINTENANCE KITS AVAILABLE:

•

Service New Desiccant Cartridge Kit - Part Number

5008414: This kit contains the parts necessary to change

the desiccant cartridge only.

•

Delivery Check Valve Maintenance Kit - Part Number

5004052: This kit contains the parts necessary to replace

the delivery check valve.

•

Purge Valve Maintenance Kit - Part Number

5018313: This kit contains the parts necessary to

replace and relubricate the purge valve sealing rings.

•

Governor/Delivery Check Valve Kit - Part Number

5004049: This kit contains the parts necessary to replace

both the governor and delivery check valve.

•

12 volt or 24 volt Heater and Thermostat Kit - Part

Numbers 109495 & 109496: Contains a replacement

heater and thermostat assembly and related components

required for replacement.

•

Purge Valve Housing Rebuild Kit - Part Number

5003547: This kit contains the parts necessary to rebuild

the purge valve sub-assembly.

•

Service New Purge Valve Housing Assembly - Part

Number 800404: Contains a service new assembly

and related components to change the purge valve sub-

assembly.

•

Pressure Protection Valve Boot Replacement- Part

Number 5005163.

•

AD-IS

Air Dryer Replacement: Replaces the complete

air dryer assembly. Includes air dryer assembly and

governor.

•

AD-IS

Air Dryer Splash Shield Replacement Kit -

Part Number 5006698.

•

Purge Reservoir Drain Valve: Replaces the drain valve

on the purge reservoir.

SEE THE AD-IS

AIR DRYER CATALOG PAGE

(STARTING ON PAGE 08-A-24) FOR A FULL LIST

OF MAINTENANCE KITS AVAILABLE.

NOTE: Kits are not available for the servicing of the pressure

protection valves (See Figure 5). Do not attempt to adjust

or service the pressure protection valves - these are not

service items.

TESTING THE AD-IS

RESERVOIR SYSTEM

Before placing the vehicle in service, perform the following

tests:

1. Close all reservoir drain valves.

AIR DRYER AND

2. Build up system pressure to governor cut-out and note

that the AD-IS

air dryer and reservoir system purges

with an audible burst of air, followed immediately by

approximately 30 seconds of air flowing out of the purge

valve.

3. "Fan" the service brakes to reduce system air pressure

to governor cut-in. Note that the system once again builds

to full pressure and is followed by a purge at the AD-IS

air dryer and reservoir system exhaust.

4. It is recommended that the total air system be tested for

leakage to assure that the AD-IS

system will not cycle excessively.

See Bendix publication BW5057 "Air Brake Handbook."

BRAKING SYSTEM PROTECTION

The AD-IS

air dryer and reservoir system allows the system

to maintain one brake circuit up to about 100 psi even after

a pressure loss in the other brake circuit. This allows a

vehicle to be moved (in an emergency), but with reduced

braking capacity. Compare this to a conventional system

where a loss of pressure in one service tank leaves the

vehicle with a limited number of reduced braking capacity

applications before the parking brakes automatically apply

and stay on.

ROADSIDE INSPECTION

In the event of a roadside inspection the system behavior

will be as follows: When the system is charged to governor

cut-out, and then one reservoir drain valve is opened, initially

both reservoir gauges will fall, however, the AD-IS

and reservoir system primary and secondary pressure

protection valves will close at pressures above 70 psi,

protecting the remaining brake circuit from further loss of

pressure.

TEMPORARY AIR DRYER AND RESERVOIR

SYSTEM BYPASS

To temporarily bypass the air dryer, the following procedure

needs to be followed:

Follow the Maintenance Precautions outlined elsewhere in

this document.

Make sure that all residual pressure has been released

and the air dryer purge reservoir has been drained to 0 p.s.i.,

then remove the air supply line from the compressor to the

inlet port (1/IN). Remove the safety valve from the AD-IS

air dryer and reservoir system body (see Figure 1 for location).

Note that a short puff of trapped air may vent from the safety

valve port when the valve is being removed. Install a T-fitting

into the port. Using any adapters necessary, reinstall the

safety valve in one of the branches of the T-fitting. Using

any adapters necessary, install the air supply line into the

remaining T-fitting port. After testing the T-fitting for any air

leakage, by using a soap solution after charging to system

air dryer and reservoir

air dryer