BENDIX SD-08-2433 manual Temporary AIR Dryer Bypass

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		5008414PG
cartridge)
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 in3 Reservoir w/ 3/8"-16 U-bolts		5012561N
93 in3 Reservoir w/ 1/2"-13 U-bolts		5005309N
288 in3 Reservoir w/ 3/8"-16 U-bolts		5008972
Purge Valve Assembly
Type	Configuration	Service Kit
		Pc. No.
	Bendix® AD-9si™Air Dryer	K022105
Purge Valve Assembly for	AD-9si™Air Dryer	K031560
climate conditions above	(Soft Seat Version)
-40°C (-40°F)
	AD-9si™Air Dryer	K031562
	(Discharge Line Unloader)
Arctic Purge Valve Assembly	AD-9si Air Dryer	K031559
	AD-9si Air Dryer	K031561
for climate conditions of
	(Soft Seat Version)
-40°C to -50°C
	AD-9si Air Dryer
(-40°F to -58°F)		K031563
	(Discharge Line Unloader)

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

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