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4. Position the end cover as marked during removal and
install the retainer ring so that the gap in the ring is
within an inch of the notch in the body.
5. Grease the threads on the three cap screws and reinstall
them with their retainers in the end cover.
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.
INSTALLATION OF AD-1
DRYER
1. Install the air dryer in the compressor discharge line as
close to the supply (first) reservoir as possible. The
discharge line between the compressor and air dryer
must not exceed 20 feet in length nor less than six feet
in length for a two cylinder compressor 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 be copper
tubing or high temperature hose. However, 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 flow 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.) clearance below dryer for servicing.
3. Mount vertically, with 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 dryseal outlet
port, a check valve must be placed between the purge
volume and the first 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
™
™
AND AD-2
AIR
terminal. This connection must be waterproof. Use an 8
to 10 amp. fuse with 12 volt end covers and with 24 volt
end covers identified with the marking "24V 120W." Use
a 4 to 5 amp. fuse with 24 volt end covers identified with
the marking "24V."
IMPORTANT NOTE: A new 24 volt heater was
introduced in 1983. The new heater version draws
120 watts of power and requires an 8 to 10 amp fuse.
End covers with the new heater are identified with
the marking "24V 120W" cast on the identification
boss of the end cover. The previous identification
was "24V".
MAINTENANCE KIT FOR THE AIR DRYER
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 identification of current revision cartridge.
This kit contains the necessary parts to rebuild the
cartridge and the desiccant sealing plate.
287313 DESICCANT CARTRIDGE REPLACEMENT KIT
This kit contains a factory replacement desiccant
cartridge and the parts necessary to rebuild the
desiccant sealing plate.
™
285519 AD-1
AIR DRYER PURGE VALVE MAINTENANCE
KIT
This kit contains the parts necessary to rebuild the
™
AD-1
air dryer end cover purge valve only.
287053 AD-2
™
AIR DRYER PURGE VALVE MAINTENANCE
KIT
This kit contains the parts necessary to rebuild the
™
AD-2
air dryer end cover purge valve.
™
287298 AD-2
AIR DRYER CHECK VALVE MAINTENANCE
KIT
This kit contains the components necessary to
rebuild the inline single check valve that is used in
AD-1
™
air dryer installations must be serviced
separately.
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.
102657 THERMOSTAT MAINTENANCE KIT
This kit contains the necessary components to
rebuild the thermostat assembly in the AD-2
dryer.
101900 REMANUFACTURED DESICCANT CARTRIDGE
AND DESICCANT SEALING PLATE.
This unit allows for complete exchange, as a unit,
of the cartridge and desiccant plate.
™
air
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