AD-4AIR Dryer Removal, Disassembly

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® 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.

11.For vehicles with Antilock Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving.

AD-4™AIR DRYER REMOVAL

1.Park the vehicle on a level surface and prevent movement by means other than the brakes.

2.Drain all reservoirs to 0 p.s.i. (0 kPa).— Caution: Compressor discharge line may still contain residual pressure.

3.Identify and disconnect the three air lines from the end cover and note the position of end cover ports relative to the vehicle.

4.Pull boot from the thermostat and heater cover and slide it onto the wire to expose the connection. Remove nut and disconnect electrical wire from the terminal. Note: Vehicles with insulated ground (2 wire) system will have two boots and two terminals to be disconnected. (See Figures 5 & 8.)

5.Loosen the 5/16" X 4-1/2" hex bolt securing the upper and lower mounting straps. Disengage the mounting

LOWER RIGHT ANGLE
BRACKET	LOCK NUT

SPECIAL

WASHER

END	EXTRA
END	LONG
COVER	CAP SCREW

FIGURE 7 - LOWER BRACKET INSTALLATION

bracket hook from the end cover (Refer to Figure 6.) Note: If the AD-4™air dryer being serviced has a right angle bracket instead of a lower mounting strap and safety hook, proceed to step 6, otherwise proceed to step 7.

6.Remove, retain and mark the two 3/8" end cover cap screws, lock nuts and four special washers that retain the lower mounting bracket to the end cover, also mark these two holes of the end cover. (These bolts are longer than the other 6 bolts.)

7.Remove the AD-4™air dryer from its mounting brackets on the vehicle.

DISASSEMBLY

The following disassembly and assembly procedure is presented for reference purposes and presupposes that a major rebuild of the AD-4™air dryer is being undertaken. Several replacement parts and maintenance kits are available which do not require full disassembly. The instructions provided with these parts and kits should be followed in lieu of the instructions presented here. Refer to Figure 6 during disassembly.

Caution: While performing service on the AD-4™air dryer, it is not recommended that a clamping device (vise, C-clamp, etc.) be used to hold any die cast aluminum component as damage may result. To hold the end cover, install a pipe nipple in the supply port and clamp the nipple into a vise.

1.Remove the remaining 3/8" lock nuts, special washers and cap screws from the flange of the air dryer and separate the end cover from the air dryer outer housing. Separate the desiccant cartridge and sealing plate from

BW1450 specifications

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