10
DELIVERY CHECK VALVE CLEANING PROCEDURE
(Note: This is only required if system pressure does not
build after temporary bypass is comple
ted.)
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.
