BENDIX AD-9 AIR DRYER User's Manual | Page 10

BENDIX Dryer User's Manual - AD-9 AIR DRYER.
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3. Install the desiccant cartridge o-ring (21) in its groove in

the end cover. Using a light coat of lubricant (included in
kit), lubricate the bottom of the desiccant cartridge in
the area that will contact the o-ring (21) and end cover.
Screw the desiccant cartridge into the end cover until
contact is made between it and the o-ring. Using a strap
or chain wrench positioned 2-3" from the bottom of the
cartridge, turn the desiccant cartridge clockwise 180-
225 degrees beyond the position where initial contact
was made between the cartridge and end cover o-ring.
Torque should not exceed 50 ft. Ibs.

4. Install the end cover outer housing o-ring (23) on the

shoulder in the end cover. Place the housing (24) over
the desiccant cartridge and align the holes. Install the
six 3/8" cap screws (16), lock nuts (19) and twelve special
washers (17) making certain they are in the proper
position as marked during disassembly. The two longer
3/8" cap screws (18) will be used to secure the AD-9™
air dryer to its mounting bracket. Tighten the six cap
screws and nuts in a star pattern in a fashion similar to
Figure 8; depending on lower bracket location. Torque
to 270-385 in. Ibs. (Refer to Fig. 8.) Note: The two
remaining bolt holes in the end cover and two 3/8" cap
screws must be the ones marked during disassembly
to assure proper orientation of the ports and adequate
length of the cap screws.

INSTALLATION

1. Install the assembled AD-9™ air dryer back onto the

vehicle by slipping it into the upper mounting bracket.
Align the two unused holes in the end cover with the
bottom mounting bracket such that the bottom bracket
supports the air dryer. The AD-9™ air dryer end cover
should rest on the bracket. Using the remaining two 3/
8" cap screws (18), four special washers (17), and two
lock nuts (19), secure the air dryer to the lower bracket.
Tighten, then torque the two remaining cap screws to
270-385 in. Ibs.

2. Tighten the 5/16" X 4-1/2" hex cap screw (25) and nut

(28) on the upper mounting bracket saddle (27) and strap
(26). Torque to 80-120 in. Ibs.

3. Reconnect the three air lines to the proper ports on the

end cover (identified during disassembly).

4. Reconnect the vehicle wiring harness to the AD-9™ air

dryer heater and thermostat assembly connector by
plugging it into the air dryer connector until its lock tab
snaps in place.

5. Before placing vehicle back into service, perform the

Operation and Leakage Tests stated elsewhere in this
manual.

RETROFITTING THE AD-9™ AIR DRYER

GENERAL

The following retrofit instructions are presented for reference
purposes only since Bendix aftermarket retrofit and
replacement air dryers are packaged with the most up-to-
date installation instructions. The instructions packaged with
the AD-9™ air dryer should be followed in lieu of those
presented here.

The preceding portion of this manual deals with “in-service”
repair and/or replacement of the AD-9™ air dryer. The portion
of the manual that follows is concerned with installing an
AD-9™ air dryer on a vehicle not previously equipped with
one.

VEHICLE APPLICATION REQUIREMENTS

The basic application requirements presented here apply to
a standard air dryer installation. The majority of highway
vehicles in use today will meet these basic requirements
however, some may not. Examples of vehicles that may not
meet the requirements include, bulk trailer unloading
operations and other high air consumption/continuous flow
systems. While the AD-9™ air dryer can be used on these
vehicles the standard installation procedure presented in
this manual may require modification to assure proper
operation and service life. Consult your local authorized
Bendix parts outlet or sales representative for additional
information.

1. Charge Cycle Time - The AD-9™ air dryer is designed to

provide clean, dry air for the brake system. When a
vehicle’s air system is used to operate non-brake air
accessories it is necessary to determine that during
normal, daily operation the compressor should recover
from governor “cut-in” to governor “cut-out” (usually 100
psi to 120 psi) in 90 seconds or less at engine RPMs
commensurate with the vehicle vocation. If the recovery
time consistently exceeds this limit, it may be
necessary to “bypass” the air accessory responsible for
the high air usage. Consult your local authorized Bendix
parts outlet or sales representative for additional
information.

2. Purge Cycle Time - During normal vehicle operation, the

air compressor must remain unloaded for a minimum
of 20 seconds for the standard AD-9™ air dryer or 30
seconds for the Extended Purge model.
 These
minimum purge times are required to ensure complete
regeneration of the desiccant material. If the purge time
is occasionally shorter than the times specified, no
permanent ill effect should be expected, however, if the
purge time is consistently less than the minimum, an
accessory by-pass system must be installed.

3. European Air Brake Systems - Brake systems that

incorporate compressors without integral unloading

 

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