BENDIX AD-9 Data Layanan - Halaman 8
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9. Use only genuine Bendix replacement parts,
components, and kits. Replacement hardware,
tubing, hose, fittings, etc. should be of equivalent
size, type, and strength as original equipment and
be designed specifically for such applications and
systems.
10. Components with stripped threads or damaged
parts should be replaced rather than repaired.
Repairs requiring machining or welding should not
be at tempted unless specifically approved and
stated by the vehicle or component manufacturer.
11. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
AD-9 REMOVAL
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). Caution:
Compressor discharge line may still contain residual
pressure.
3. Identify and disconnect the three air lines from the end
cover and note the position of end cover ports relative to
the vehicle.
4. Unplug the vehicle wiring harness from the heater and
thermostat assembly connector on the purge valve
housing assembly.
5. Loosen the 5/16" X 4-1/2" hex bolt securing the upper
mounting strap.
6. Remove, retain and mark the two 3/8" end cover cap
screws, lock nuts and four special washers that retain
the lower mounting bracket to the end cover, also mark
these two holes of the end cover. (These bolts are longer
than the other 6 bolts.)
7. Remove the AD-9 air dryer from its mounting brackets
on the vehicle.
DISASSEMBLY
The following disassembly and assembly procedure is
presented for reference purposes and presupposes that a
major rebuild of the AD-9 is being undertaken. Several
replacement parts and maintenance kits are available which
do not require full disassembly. The instructions provided
with these parts and kits should be followed in lieu of the
instructions presented here. Refer to Figure 7 during
disassembly.
Caution: While performing service on the AD-9 air dryer, it
is not recommended that a clamping device (vise, C-clamp,
etc.) be used to hold any die cast aluminum component as
damage may result. To hold the end cover, install a pipe
nipple in the supply port and clamp the nipple into a vise.
8
1. Using an adjustable wrench or an 1-3/4" socket, remove
the delivery, check valve assembly (15) and o-ring.
Remove the o-ring from the check valve assembly.
2. Remove the three 1/4" self tapping screws (3) that secure
the purge valve housing assembly to the end cover
assembly. Pull the purge valve housing assembly out of
the end cover assembly. Remove the three o-rings (5,6 &
7) from the exterior of the purge valve housing assembly.
Note: O-rings 5 and 6 may be lodged in the end cover
bores, if so, they must be removed
3. Purge Valve Disassembly:
Note: In most cases a flat (non-extended) exhaust cover
(30) is used. This cover should be left intact while
servicing the purge valve housing assembly. However, if
an extended type exhaust cover is in use to
accommodate the attachment of an exhaust hose, the
exhaust cover must be carefully peeled off the purge
valve housing. Use a thin flat blade to pry the exhaust
cover off, taking care not to damage the potting
material (RTV sealant) under the cover. To remove
the piston from the purge valve housing assembly requires
a special Torx head socket or a twelve point 1/4" socket
to hold the head of the purge valve bolt (31).
A. Remove the 1/4" nut (4) from the bottom of the purge
valve housing assembly using a 9/16" socket wrench
and a Torx head socket to hold the head of the bolt
(31). Remove the diaphragm washer (32) (if present),
and the diaphragm (2) (if present), and the purge
valve (11) from the purge valve housing.
B. Remove the 1/4" Torx head bolt (31) from the oppo-
site end, then the purge piston (33), the return spring
(13) and two o-rings (10 & 14); one on the O.D. and
the other in the inside of the purge piston.
C. Heater and Thermostat Assembly Replacement.
Caution: Do not attempt to remove this assembly,
as it will be damaged during the removal process
and is not available as a service part. If the heater
and thermostat are defective, replace the entire purge
valve housing assembly which includes these items.
4. Remove the remaining six 3/8" cap screws (16), lock
nuts (19) and twelve special washers (17) that secure
the end cover to the housing (24). Separate the end cover
and desiccant cartridge (22) from the housing (24).
5. Remove the end cover to outer housing o-ring (23).
6. Do not remove the safety valve from the end cover unless
it has been proven defective. If replacement is required,
apply thread sealant or teflon tape on the threads of the
replacement valve and torque to 120-400 in. Ibs.
7. Place a strap or chain wrench around the desiccant
cartridge (22) so that it is approximately 2-3 inches away
from the end cover. Rotate the cartridge counterclockwise
until it completely separates from the end cover. Note:
A substantial torque (up to 50 lb. ft.) may be required to
perform this disassembly.