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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
13
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