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6. Reconnect the air control line to the purge valve port

in the end cover.

7. Reconnect the thermostat and heater wire.

8. Test the air dryer as outlined under the Preventive

Maintenance and Checking Serviceability Section of

this manual.

AIR DRYER INSTALLATION

1. Install the air dryer in the compressor discharge line

as close to the supply (ﬁ rst) reservoir as possible. The

discharge line between the compressor and air dryer:

a) must not exceed 20 feet in length; b) nor less than

six feet in length for a two cylinder compressor; c) or

ten feet in length for a single cylinder compressor. Six

feet of discharge line and a 90 cubic inch reservoir can

be used in lieu of ten feet of discharge line for single

cylinder compressors.

The discharge line should slope downward from the

compressor to the air dryer inlet to avoid water traps

and to allow drainage to the air dryer. (If the 90 cubic

inch reservoir is used, it should also be mounted and

plumbed to avoid water traps and to allow drainage into

the air dryer.) Discharge lines may be either copper

tubing or high temperature hose. Note that Bendix

compressors require a minimum of four feet of copper

tubing extending from the discharge port. The balance

of the discharge line may be either copper tubing or

high temperature hose.

2. Locate outside the engine compartment in an area of air

ﬂ ow when the vehicle is in motion. Do not mount near

exhaust system or other heat-producing components

and avoid road-splash areas. Provide 20 cm (8 in.) of

clearance below the dryer for servicing.

3. Mount vertically, with the purge valve exhaust toward

the ground, away from the frame and other components.

Connect a hose to the exhaust cover, if necessary, since

this valve may expel rust and scale particles as well as

condensate and oil collected in the dryer.

4. Connect the purge valve control port to one of the

governor unloader ports. This line should be routed

such that no water traps are formed.

5. For the dryers with a 3/4-14 or 1 - 11-1/2 dry seal outlet

port, a check valve must be placed between the purge

volume and the ﬁ rst downstream reservoir. (Dryers with

1/2-14 dryseal outlet ports have a built-in check valve.)

6. Connect a fused #16 gauge wire from the "on" position

of the engine control or ignition switch to the heater

terminal. This connection must be waterproof. Use an

8 to 10 amp fuse with 12 volt end covers and with 24

volt end covers identiﬁ ed with the marking "24V 120W."

Use a 4 to 5 amp fuse with 24 volt end covers identiﬁ ed

with the marking "24V."

MAINTENANCE KITS

286718 – DESICCANT CARTRIDGE REFILL KIT: This

kit can only be used on new revision cartridges. See

the cartridge rebuild section of this manual for proper

identiﬁ cation of current revision cartridge. This kit contains

the necessary parts to rebuild the cartridge and the

desiccant sealing plate.

286875N – END COVER ASSEMBLY KIT: This kit contains

the complete end cover.

287313 – DESICCANT CARTRIDGE REPLACEMENT KIT:

This kit contains a factory replacement desiccant cartridge

and the parts necessary to rebuild the desiccant sealing

plate.

1 0 1 9 0 0 X – R E M A N U FA C T U R E D D E S I C C A N T

CARTRIDGE AND DESICCANT SEALING PLATE:

This unit allows for complete exchange, as a unit, of the

cartridge and desiccant plate.

287053N – Bendix

AD-2

MAINTENANCE KIT: This kit contains the parts necessary

to rebuild the AD-2 air dryer end cover purge valve.

2 8 7 2 9 8 N – A D - 2 A I R D RY E R C H E C K VA LV E

MAINTENANCE KIT: This kit contains the components

necessary to rebuild the old-style, two-piece check valve.

It does not service the new-style, one-piece check valve

assembly.

107454N – AD-2 AIR DRYER CHECK VALVE: Replaces

the one-piece and two-piece check valves.

288918 – THERMOSTAT COVER REPLACEMENT

KIT: This kit contains the parts required to replace the

non-metallic thermostat cover only. This kit is used to

replace a damaged cover and does not contain thermostat

parts.

102657N – THERMOSTAT MAINTENANCE KIT: This

kit contains the necessary components to rebuild the

thermostat assembly in the AD-2 air dryer.

AIR DRYER PURGE VALVE