Vehicle Preparation - BENDIX AD-9 Service Data

2. Purge Cycle Time - During normal vehicle operation,
the air compressor must remain unloaded for a
minimum of 20 seconds for the standard 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 specifi ed,
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
mechanisms, and/or utilize a compressor discharge
line unloader valve, have special Bendix
®
AD-9 IPC air dryer installation requirements. Consult
your local authorized Bendix parts outlet or sales
representative for additional information.
4. Holset "E or QE" Type Air Compressors - In order for the
AD-9 or AD-9 IPC air dryer to function properly when
installed with the Holset Type "E or QE" compressor,
several specialized Holset components are required.
Consult your local authorized Holset parts outlet or
sales representative for additional information.
5. Use of Standard or Extended Purge AD-9 or AD-9 IPC
Air Dryer - Use the following guidelines:
Total Vehicle
Reservoir Volume
Less than 9,000 cu. in.
9,000 - 12,500 cu. in.
Greater than 12,500 cu. in.

VEHICLE PREPARATION

1. Park the vehicle on a level surface and prevent
movement by means other than the brakes.
2. Drain all reservoirs to 0 psi (0 kPa).
LOCATING THE BENDIX
VEHICLE
1. The AD-9 or AD-9 IPC air dryer must be mounted
vertically (purge exhaust toward road surface) outside
the engine compartment in an area of air fl ow while the
vehicle is in motion. The air dryer must not be exposed
to direct wheel splash (located behind axle mud fl ap is
acceptable).
2. Locate the AD-9 or AD-9 IPC air dryer as close to the
fi rst (supply) reservoir as possible.
® AD-9 ®
® ®
Bendix AD-9 or
AD-9 ® IPC Air Dryer
Requirement
Standard Air Dryer
Extended Purge Air Dryer
Contact Bendix Rep. or Bendix
Engineering
® ®
AD-9 AIR DRYER ON
3. Do not locate the AD-9 or AD-9 IPC air dryer near heat
producing components, such as the vehicle exhaust,
and make certain adequate clearance from moving
components (e.g. drive shaft, suspension, pitman arm,
etc.) is provided.
4. Locate the AD-9 or AD-9 IPC air dryer on the vehicle
so that a minimum of 11 inches (28 cm) clearance
below the end cover is available to allow servicing.
Alternatively, provide access to the bracket bolts so
the unit may be removed for servicing.
5. When choosing the mounting location for the AD-9
or AD-9 IPC air dryer, note the discharge line length
requirements stated under the heading Connecting the
and
Air Lines, elsewhere in this instruction sheet.
Important Note: Under normal operating conditions,
the maximum inlet air temperature for the AD-9 and
AD-9 IPC air dryers is 160 degrees Fahrenheit.
MOUNTING THE BENDIX
AIR DRYER
1. To install the lower mounting bracket on the AD-9 or
AD-9 IPC air dryer, it will be necessary to remove and
discard two of the end cover bolts and locknuts. To
determine which end cover bolts to utilize to attach
the lower bracket, take into consideration the piping
connections required to install the air dryer and
use those that will best position the unit for ease of
installation. Locate the bracket such that it cradles
the end cover as shown in Figure 9. Utilizing the two
2-3/8" long cap screws, locknuts and special washers
provided with the AD-9 or AD-9 IPC air dryer retrofi t
unit, attach the lower mounting bracket and torque to
270–385 in. lbs.
2. Assemble the mounting strap and upper mounting
bracket as illustrated in Figure 10, by utilizing the 5/16"
cap screw and sleeve nut.
3. Place the upper bracket assembly onto the shell of
the AD-9 or AD-9 IPC air dryer and orient it so that it
bears entirely on the cylindrical surface and does not
extend onto the domed top. The slot spacing between
the upper and lower bracket should be a minimum of
5.5 inches apart. Do not tighten strap onto the shell at
this time.
4. Mount the air dryer on the vehicle using 3/8" bolts
(grade 5 min.) and washers. Torque to 25 ft. lbs. (300
inch pounds.) After positioning and mounting the
upper bracket assembly according to the installation
requirements, torque the 5/16" nut to 80–120 in. lbs.
to tighten strap onto the shell.
® ® ®
AD-9 AND AD-9 IPC
17