6
LEAKAGE TEST
Place the park control valve in the “release” position; using
a soap solution, coat the exhaust and vent hole (in the
proximity of the adjusting screw). Slight bubble leakage
is permitted.
If the Bendix
®
R‑7
™
valve does not function as described,
or if leakage is excessive, it is recommended that it be
repaired or replaced with a genuine Bendix
®
service
replacement valve.
DISASSEMBLY
1. Remove the exhaust cover screw, exhaust cover and
exhaust diaphragm.
2. Remove the four (4) cap screws, and lockwashers and
cover. Remove the o‑ring from the cover.
3. Remove the control piston and remove three (3) o‑rings
from the control piston.
4. Remove the large retaining ring from the body and
remove the inlet/exhaust valve assembly.
5. Remove the retaining ring from the inlet/exhaust valve
assembly. Remove the o‑ring retainer, and the o‑ring
from the o‑ring retainer. Remove the washer and
spring. Remove the valve retainer and the valve from
the valve body.
6. Remove the four (4) cap screws from the other cover.
7. Remove the cover, along with the inner and outer
springs.
8. Remove the balance piston. Remove the o‑ring from
the balance piston.
9. Remove the retaining ring from the supply port and
remove the supply adapter and double check valve
assembly. Remove the o‑ring from the supply adapter.
Remove the double check valve from the shuttle guide.
(NOTE: To ease removal of the supply adapter, a pipe
nipple can be screwed into the adapter.)
10. Remove the Allen head plug from the single check valve
service port. Remove the single check valve assembly.
(If the single check valve is difcult to remove, it can
be dislodged inside the bore of the body of the valve).
ASSEMBLY
Before assembly, lightly lubricate all o‑rings, bores and
mating surfaces with silicone lubricant BW‑650‑M (Bendix
Pc. No. 291126).
1. Install the single check valve assembly and Allen head
plug. Tighten securely.
2. Install the o‑ring on supply adapter, install the shuttle
guide over the supply adapter and install the double
check valve in the guide.
3. Install the adapter and double check valve assembly
in the supply port. Install the retaining ring, making
certain the retaining ring is engaged in groove.
4. Install the o‑ring on the balance piston then install the
balance piston in the bore of the body.
5. Install the inner and outer springs and spring seat (note
that the cone shaped protrusion on spring seat faces
the springs).
6. Install the cover with four (4) cap screws, torque to
approximately 45 in‑lbs.
7. Install the valve on valve body. Install the valve
retainer, spring, and washer. Install the o‑ring on the
o‑ring retainer. Install the o‑ring retainer, compress
the retainer and install the retaining ring. Make certain
the retaining ring is engaged in the groove of the valve
body.
8. Install the inlet/exhaust valve assembly in body. Install
the retaining ring making certain the retaining ring is
engaged in the groove in the bore of the body.
9. Install the three (3) o‑rings on the control piston. Install
the control piston in the body. (The larger diameter
stem should point up).
10. Install the o‑ring on the cover. Install the cover with
the four (4) cap screws and lockwashers. Torque to
approximately 100 in‑lbs.
11. Install the exhaust diaphragm and exhaust cover.
TESTING REBUILT BENDIX
®
R-7
™
MODULATING
VALVES
Perform the operating and leakage tests as outlined in the
“Service Tests” section.
SD‑03‑4504 © 2014 Bendix Commercial Vehicle Systems LLC, a member of the Knorr‑Bremse Group • 05/14 • All Rights Reserved.
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