BENDIX AD-1 Manual - Page 6

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D. Reassembly

Reinstall the thermostat cover according to Figure

17. Take special care to assure the rubber spacer

and the gasket are correctly installed, to assure

proper operation.

8. Every 7200 hours; 200,000 miles or every 24 months,

change the desiccant cartridge.

NOTE: The desiccant change interval may vary from vehicle

to vehicle. Although typical desiccant cartridge life

is two years, many will perform adequately for three

to four years. In order to take maximum advantage

of desiccant life and assure that replacement

occurs only when necessary, it is important that

Serviceability Checks 1 - 7 be performed.

WARNING! PLEASE READ AND FOLLOW

THESE

INSTRUCTIONS

PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following

general precautions should be observed at all times.

1. Park the vehicle on a level surface, apply the parking

brakes, and always block the wheels. Always wear

safety glasses.

2. Stop the engine and remove ignition key when

working under or around the vehicle. When working

in the engine compartment, the engine should be

shut off and the ignition key should be removed.

Where circumstances require that the engine be in

operation, EXTREME CAUTION should be used to

prevent personal injury resulting from contact with

moving, rotating, leaking, heated or electrically

charged components.

3. Do not attempt to install, remove, disassemble or

assemble a component until you have read and

thoroughly understand the recommended

procedures. Use only the proper tools and observe

all precautions pertaining to use of those tools.

4. If the work is being performed on the vehicle's air

brake system, or any auxiliary pressurized air

systems, make certain to drain the air pressure from

all reservoirs before beginning ANY work on the

vehicle. If the vehicle is equipped with an AD-IS

air dryer system or a dryer reservoir module, be

sure to drain the purge reservoir.

5. Following the vehicle manufacturer's recommended

procedures, deactivate the electrical system in a

manner that safely removes all electrical power from

the vehicle.

6. Never exceed manufacturer's recommended

pressures.

7. Never connect or disconnect a hose or line

containing pressure; it may whip. Never remove a

component or plug unless you are certain all system

pressure has been depleted.

8. Use only genuine Bendix

9. Components with stripped threads or damaged parts

10. Prior to returning the vehicle to service, make

REPLACING OR REBUILDING THE AD-1

AD-2

AVOID

GENERAL

If, after completing the routine serviceability tests, it has

been determined that one or more components of the air

dryer requires replacement or maintenance, refer to page

13 to ascertain the appropriate kit(s) needed. When rebuilding

or replacing components of the air dryer use only genuine

Bendix replacement parts or kits.

REMOVAL OF DESICCANT CARTRIDGE AD-1

AIR DRYER

1. Loosen the air line to the control port of air dryer and

2. Loosen the delivery line from the delivery port or outlet

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3. Disconnect the heater wire.

4. Remove any exhaust silencers or the exhaust check

5. Check all ports to insure that air is not trapped in the air

Air Dryer End Cover Removal Procedure

Warning - The AD-2

spring load. When replacing the AD-2

performing any maintenance requiring end cover removal

follow the procedure outlined below.

components and kits. Replacement hardware,

tubing, hose, fittings, etc. must be of equivalent size,

type and strength as original equipment and be

designed specifically for such applications and

systems.

should be replaced rather than repaired. Do not

attempt repairs requiring machining or welding

unless specifically stated and approved by the

vehicle and component manufacturer.

certain all components and systems are restored to

their proper operating condition.

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AIR DRYER

CAUTION!

allow the trapped air to escape to atmosphere. After

the air escapes, remove the control line from the air

dryer.

of the air dryer. After the pressure drops, remove the

delivery line. Loosen the delivery check valve from this

port to relieve any trapped air above the desiccant plate

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assembly. If the AD-1

air dryer has an external check

valve at the delivery port loosen it to relieve air pressure.

valve cover from the base of the air dryer. Using a hex

socket and wrench, loosen the purge valve assembly

and allow any trapped air to escape. Slowly unscrew the

purge valve and remove it.

dryer by powdered desiccant material.

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air dryer cartridge contains a high

replacement parts,

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AND

™

& AD-2

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air dryer cartridge or