Bendix Commercial Vehicle Systems R-12P PILOT RELAY VALVE 4/11 User Manual

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5. Make certain the air channel running from the cover

through the top surface of the body to the supply port
is clear and free of obstruction.

6. Inspect the pipe threads in the body. Make certain they

are clean and free of thread sealant.

7. Inspect all air line fi ttings for corrosion. Replace as

necessary. Remove all old thread sealant before
reuse.

ASSEMBLY

1. Before assembly, lubricate all o-rings, seals, and pistons

as well as body and cover bores, using the lubricant
provided in the maintenance kit. Use all of the lubricant,
and spread it evenly on all rubbing surfaces.

2. Install valve retainer (11) on inlet/exhaust valve (12)

so that the fl ange of the retainer surrounds the rubber
portion of the valve.

3. Install inlet/exhaust valve (12) in the body.

4. Install valve spring (10) over the inlet/exhaust valve in

the body.

5. Install large and small diameter o-rings (8) and (9) in

exhaust cover (7).

6. Place the exhaust cover on the inlet/exhaust valve

spring. Then depress the cover against the spring’s
force into the body. Secure the cover with the snap
ring (6).

7. Install o-rings (4) and (5) onto the relay piston. Then

place the reserve spring in the piston and install the
piston into the body.

8. Install the load piston’s o-ring (3) onto the load piston.

Then install the load piston into the cover, small end
fi rst.

9. Install small o-ring (1) that seals the internal channel

and large o-ring (2) onto the cover.

10. Place the cover on the body and secure with its four

fasteners. Torque to 120 - 150 in. lbs.

11. Perform OPERATIONAL AND LEAKAGE TESTS before

returning the vehicle to service.