Vehicle Preparation; Locating Ad-4 Air Dryer On Vehicle; Connecting The Air Lines; Mounting The Ad-4 Air Dryer - BENDIX AD-4 AIR DRYER Manual

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 p.s.i. (0 kPa).
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LOCATING AD-4 AIR DRYER ON VEHICLE
1. The AD-4 ™ air dryer must be mounted vertically (purge
exhaust toward road surface) outside the engine
compartment in an area of air flow while the vehicle is in
motion. The AD-4 ™ air dryer must not be exposed to
direct wheel splash (located behind axle mud flap is
acceptable).
2. Locate the AD-4 ™ air dryer as close to the first (supply)
reservoir as possible.
3. Do not locate the AD-4
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-4 ™ air dryer on 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-4
dryer, note the discharge line length requirements stated
under the heading Connecting the Air Lines, elsewhere
in this instruction sheet.
Important Note: Under normal operating conditions, the
maximum inlet air temperature for the AD-4
160 degrees Fahrenheit.
MOUNTING THE AD-4
1. Assemble the mounting strap and mounting bracket as
illustrated in Figures 5 & 6 using the 5/16" screws, nuts
and lock washers. Make certain the mounting bracket
hook is installed on the 5/16" screw of the lower mounting
bracket and that it engages the AD-4
Make certain that the inside surface of the top mounting
strap bears entirely on the cylindrical surface of the dryer
shell and that it does not overlap the domed top. The
brackets should be a minimum of 5.5 inches apart. After
positioning the mounting straps according to the
installation requirements, torque both 5/16" screws to
80-120 inch pounds.
Note: The mounting bracket at the base of the AD-4
dryer can be of two types. The one described above or a
single piece right angle bracket. (See Figure 7.) To install
the single piece lower mounting bracket, remove and
discard two of the bolts and nuts that retain the end
cover. Install the lower mounting bracket as shown in
Figure 7. Utilizing the bolts and lock nuts provided with
12
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air dryer near heat producing
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air dryer is
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AIR DRYER
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air dryer end cover.
the bracket and placing the washers removed in proper
sequence, torque to 270-330 inch pounds. To determine
which end cover bolts to utilize to attach the bracket,
take into consideration the piping connections required
to install the AD-4
position the unit for ease of installation.
2. A universal mounting plate (Pc. No. 248478) is available
to facilitate the mounting of the AD-4
included in kits but can be obtained through an authorized
Bendix parts outlet.
3. Use 3/8" bolts (grade 5 min.) and washers (not furnished)
to mount the AD-4
ft. Ibs. (300 inch pounds).

CONNECTING THE AIR LINES

PURGE CONTROL LINE
1. Install a purge control air line having a minimum inside
diameter of 3/16 inches between the AD-4
end cover control port and an unused unloader port on
the governor. The control line must be plumbed direct to
the governor and not in series with automatic drain valves,
lubrication systems, etc.
2. The control line should slope downward to the end cover
without forming potential water traps.
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DISCHARGE LINE
General:
Refer to Appendix A, Table A for recommended discharge
line lengths and sizes for various vehicle applications and
vocations.
PURGE EXHAUST LINE
1. If it is necessary to direct AD-4
contaminants away from vehicle components a 1.5 inch
(38.1 mm) I.D. hose can be clamped on the AD-4
dryer exhaust cover.
WIRING THE HEATER/THERMOSTAT
1. Note the required voltage and wattage for the AD-4
dryer heater by checking the end cover as shown in
Figure 8.
2. Remove the rubber boot covering the single electrical
terminal of the standard AD-4
a 16 gauge wire between the "on" position of the vehicle
ignition or engine "kill" switch and the heater/thermostat
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air
electrical terminal. An 8-10 amp fuse is required in this
line regardless of voltage.
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air dryer and use those that will best
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air dryer. It is not
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air dryer to the vehicle. Torque to 25
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air dryer discharge
™ air dryer end cover. Install
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air dryer
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air
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