Hino 600, Workshop Manual, Page: 290 / 451

SERVICE BRAKE (FULL AIR BRAKE) BR02–12
DELIVERY CHECK VALVE CLEANING PROCEDURE
(Note: This is only required if system pressure does not build after temporary bypass is completed.)
See Figure 7 throughout this procedure. Depressurize the air brake system following the general safety precautions outlined
elsewhere in this document. Also, always depressurize the air dryer purge reservoir before servicing the air dryer.
This procedure does not require removal of the AD-IS

air dryer and reservoir system from the vehicle.
.
1. Remove the line from the governor and mark for easy reinstallation.
2. Remove the bolts attaching the governor to the AD-IS

air dryer and reservoir system and retain for reassembly.
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 reassembly 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 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 AD-IS

air dryer and reservoir system.)
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 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 replace-
ment kit available at authorized Bendix parts outlets.
5. Inspect all air line fittings for corrosion and replace as necessary.
ASSEMBLY
.
1. Lubricate the smaller o-ring and check valve body with Bendix supplied barium or silicon grease.
2. Install this o-ring on the check valve body by sliding the o-ring over the set of 4 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 4 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 fitting.
6. Position the Bendix supplied 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. Reattach line to the governor.
8. Before placing vehicle back into service, check to see that the system pressure now builds to full operational pressure.