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DELIVERY CHECK VALVE CLEANING PROCEDURE

(Note: This is only required if system pressure does not

build after temporary bypass is completed.)

Refer to Figure 6 throughout the following procedures.

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.

This procedure does not require removal of the Bendix

AD-IS

air dryer and reservoir from the vehicle.

1. Remove the line from the governor and mark for easy

re-installation.

2. Remove the bolts attaching the governor to the

AD-IS air dryer and reservoir system and retain for

re-assembly.

3. Remove the governor from the air dryer. Be aware that

a short puff of trapped air may vent when the governor is

removed. Retain the governor gasket for re-assembly if

a new governor gasket is not available. Remove and

retain the o-ring from the adapter.

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

5. 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-IS

air dryer and reservoir system.) Superﬁ cial

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 delivery check valve from seating),

replace the AD-IS 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

outlets.

5. Inspect all air line ﬁ ttings for corrosion and replace as

necessary.

ASSEMBLY

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

a heavy duty lithium grease.

2. Install this 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 adapter and the remaining larger o-ring and

install it onto the ﬁ tting.

6. Position the governor gasket, then insert the governor

mounting bolts through the governor and tighten (to

125 in-lbs). (Note: Do not replace with a standard

compressor/governor gasket.)

7. Re-attach line to the governor.

8. Before placing vehicle back into service, check to see

that the system pressure now builds to full operational

pressure.