Bendix Commercial Vehicle Systems AD-9si Oil Coalescing Air Dryer - Manual (Page 10)

10
DO NOT ATTEMPT TO REMOVE THE CLAMP BAND
THAT RETAINS THE TWO HOUSINGS TOGETHER.
SERIOUS INJURY OR DEATH MAY OCCUR IF THESE
INSTRUCTIONS ARE NOT FOLLOWED COMPLETELY.
BENDIX ® AD-9si ™ AIR DRYER REMOVAL
This air dryer removal process is presented in the event it
becomes necessary to replace the entire air dryer. Normal
service and parts replacement does not require removal
of the air dryer from the vehicle.
1. Park the vehicle on a level surface and prevent
movement by means other than the brakes.
2. Drain all reservoirs to 0 psi.
3. Identify and disconnect the three air lines from the air
dryer housing.
4. Unplug the vehicle wiring harness from the heater and
thermostat assembly connector.
5. Remove the three mounting bolts that secure the air
dryer to the vehicle.
BENDIX AD-9si AIR DRYER INSTALLATION
1. Install the Bendix ® AD-9si ™ air dryer on the vehicle using
the three existing 1/2"-13 UNC bolts. Torque the bolts
to 720-912 in-lbs. If replacement bolts are necessary
use grade 5 or above and ensure they are the same
length as those originally used to install the dryer. If
the original air dryer is being reinstalled make sure the
threads in the air dryer housing are in good condition.
2. Reconnect the three air lines to the proper ports on the
air dryer—identified during step 3 of the Bendix AD-9si
removal.
3. Reconnect the vehicle wiring harness to the AD-9si
air dryer heater and thermostat assembly connector
by plugging it into the air dryer connector until its lock
tab snaps in place.
4. Before placing the vehicle back into service test the
air dryer operation as indicated in Testing The Bendix
AD-9si Air Dryer section that follows.
TESTING THE BENDIX AD-9si AIR DRYER
Before placing the vehicle into service, perform the
following tests:
1. Close all reservoir drain valves.
2. Build up system pressure to governor cut-out and note
that the Bendix AD-9si air dryer purges (with an audible
burst of air), followed immediately by approximately 40
seconds of air flowing out of the purge valve.
Bendix ® AD-9si ™ Maintenance Kits
Kit Description Piece No.
Delivery Check Valve Replacement Kit K092011
Desiccant Cartridge Replacement Kit (Standard) 5008414
Desiccant Cartridge Replacement Kit - Bendix AD-9si
PuraGuard ® air dryer (can be used to replace the standard
cartridge)
5008414PG
Governor Kit K092010
Heater & Thermostat Replacement (12 volt) 109578
Heater & Thermostat Replacement (24 volt) 109579
Safety Valve Replacement 800155
Silencer Kit (not shown) K021189
Wiring Harness & Splice Kit (not shown) 109871N
Extended Purge Kits (not shown)
93 in 3 Reservoir w/ 3/8"-16 U-bolts 5012561N
93 in 3 Reservoir w/ 1/2"-13 U-bolts 5005309N
288 in 3 Reservoir w/ 3/8"-16 U-bolts 5008972
Purge Valve Assembly
Type Configuration
Service Kit
Pc. No.
Purge Valve Assembly for
climate conditions above
-40°C (-40°F)
Bendix ® AD-9si ™ Air Dryer K022105
AD-9si ™ Air Dryer
(Soft Seat Version)
K031560
AD-9si ™ Air Dryer
(Discharge Line Unloader)
K031562
Arctic Purge Valve Assembly
for climate conditions of
-40°C to -50°C
(-40°F to -58°F)
AD-9si Air Dryer K031559
AD-9si Air Dryer
(Soft Seat Version)
K031561
AD-9si Air Dryer
(Discharge Line Unloader)
K031563
3. Apply and release the service brakes several times to
reduce system air pressure to governor cut-in. Note
that the system once again builds to full pressure and
is followed by a purge at the air dryer exhaust.
4. It is recommended that the total air system be tested
for leakage to ensure that the AD-9si air dryer will not
cycle excessively.
It is important to read and adhere to the following
instruction, to ensure the brake system operates safely
after bypassing the air dryer.
TEMPORARY AIR DRYER BYPASS
To temporarily bypass the air dryer, follow these procedures
and be sure to adhere to the General Safety Guidelines
outlined elsewhere in this document.
Make sure that all residual pressure has been released.
Slowly loosen the fitting that connects the air compressor
discharge line to the air dryer inlet port (IN 1) thereby
allowing any pressure trapped in the air dryer purge
reservoir to escape to the atmosphere. Once the pressure
has escaped and air flow has ceased, remove the fitting