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 TO AVOID 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
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® replacement parts, 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.
9.Components with stripped threads or damaged parts 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.
10.Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition.
REPLACING OR REBUILDING THE AD-1™ AND AD-2™ AIR DRYER
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™ & AD-2™ AIR DRYER
CAUTION!
1.Loosen the air line to the control port of air dryer and allow the trapped air to escape to atmosphere. After the air escapes, remove the control line from the air dryer.
2.Loosen the delivery line from the delivery port or outlet 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 assembly. If the
3.Disconnect the heater wire.
4.Remove any exhaust silencers or the exhaust check 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.
5.Check all ports to insure that air is not trapped in the air dryer by powdered desiccant material.
Air Dryer End Cover Removal Procedure
Warning - The
6
