Bendix Commercial Vehicle Systems R-12P PILOT RELAY VALVE 4/11 - Manual (Page 7)

7
FIGURE 10 - EXPLODED VIEW
1
9
8
2
3
LOAD
PISTON
4
10
5
11
12
FASTENER
RELAY PISTON
7
BODY
COVER
RESERVE
SPRING
6
DISASSEMBLY
The following procedure is for reference only. Always
have the appropriate maintenance kit on hand, and use
its instructions in lieu of those presented here. Refer to
Figure 10 throughout.
CAUTION: The Bendix ® R-12P ™ valve may be lightly
clamped in a bench vise during disassembly.
However, overclamping will cause damage
to the valve and result in leakage and/or
malfunction. If a vise is used, position the
valve so the jaws bear on the supply ports on
opposing sides of the valve’s body.
1. Remove the four fasteners that secure the cover to the
body. Then slowly remove the cover.
2. Remove and discard the small o-ring (1) that seals the
internal channel and the large o-ring (2) between the
cover and the body.
3. Remove the load piston from the cover. Note: If
necessary, use approximately 20 psi of shop air,
directed into the load piston’s air passage in the cover,
to dislodge it. CAUTION: The piston will leave the cover
with some force.
4. Remove and discard the load piston’s o-ring (3).
5. Remove the reserve spring and the relay piston from
the body. Remove and discard the relay piston’s o-rings
(4) and (5).
6. While holding exhaust cover (7), remove and discard
the snap ring (6) that secures the cover to the body.
7. Remove and discard exhaust cover (7) and its o-rings
(8) and (9).
8. Remove and discard valve spring (10), valve retainer
(11), and inlet/exhaust valve (12) from the body.
CLEANING & INSPECTION
1. Using mineral spirits or an equivalent solvent, clean and
thoroughly dry all metal parts. Do not damage bores
with metal tools.
2. Wash all non-metallic components in a soap and water
solution. Dry thoroughly.
3. Inspect interior and exterior of all metal parts for severe
corrosion, pitting, and cracks. Superfi cial corrosion
and/or pitting on the exterior of the body and cover
is acceptable. Replace the entire valve if the body or
cover interior show signs of corrosion or pitting.
4. After washing, inspect relay piston for cracks, wear,
or distortion. Replace the valve if these conditions are
found.