BENDIX AD-9si Service Data - Page 12

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Note: This is a temporary bypass of the air dryer. Full

repair of the unit must be carried out at the earliest

opportunity. Excessive vehicle operation with the air

dryer bypassed may damage oil sensitive components

such as an automated manual transmission or the

emission system. With the air dryer removed from the

system, contaminants will be entering the air brake system.

Reservoirs will need to be manually drained daily until the

repairs are completed. At the end of each working day,

park the vehicle and slowly drain pressure through the

drain valves – leave open to the atmosphere – for several

hours, if possible. When repairs are carried out, be sure

to check that all reservoirs are emptied of all contaminants.

If, after bypassing the air dryer, the system pressure still

does not build, use the following procedure to remove,

clean, and reinstall the delivery check valve.

DELIVERY CHECK VALVE CLEANING PROCEDURE

(Note: This is only required if system pressure does

not build after temporary bypass is completed.)

Refer to Figure 7 throughout the following procedure.

De-pressurize the air brake system following the general

safety precautions outlined elsewhere in this document.

Also, always de-pressurize the air dryer purge reservoir

before servicing the air dryer by slowly loosening the fitting

that connects the air compressor discharge line to the air

dryer inlet port.

This procedure does not require removal of the Bendix

AD-9si

air dryer from the vehicle.

1. Remove the delivery check valve cover, located directly

above the delivery port (OUT 21).

2. The spring/delivery check valve can now be removed.

3. Remove and retain the o-ring from the check valve

body.

CLEANING & INSPECTION

1. Use a suitable solvent to clean all metal parts, and

use a cotton swab to clean the bore (Note: Do not use

abrasives or tools to clean the bore: any scratches

caused may necessitate replacing the Bendix AD-9si

air dryer.) Superficial external corrosion and/or

pitting is acceptable.

2. Clean the o-rings with a clean dry cloth. Do not use

solvents.

3. Inspect for physical damage to the bore and the check

valve seat. If the bore is damaged (by scratches

etc. that would prevent the delivery check valve from

seating), replace the AD-9si air dryer.

4. Inspect the delivery check valve, o-rings, etc. for wear or

damage. Replace, if necessary, using the check valve

replacement kit available at any authorized Bendix

parts outlet.

ASSEMBLY

1. Lubricate the smaller o-ring and check valve body with

a heavy-duty lithium grease.

2. Install the o-ring on the check valve body by sliding the

o-ring over the set of four tapered guide lands. The

o-ring groove holds the o-ring in its correct location.

3. At the other end of the check valve body, the spring is

installed over the set of four straight guide lands. When

the spring has been pushed to the correct location, the

check valve body is designed to hold the end of the

spring in position: be sure that the spring is not loose

before continuing with this installation.

4. Install the assembled check valve body/o-ring/spring

in the delivery port so that the o-ring rests on its seat

and the free end of the spring is visible.

5. Grease the larger o-ring and install it onto the cover.

6. Replace the delivery check valve cover and torque to

720–840 in-lbs.

7. Before placing the vehicle back into service, check

to see that the system pressure now builds to full

operational pressure.