BENDIX BW2066 User Manual Page 6

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6
11. Remove the relay piston (20), relay piston spring (21),
primary piston (E-8P
valve: 22, E-10P
valve: 2) and
primary piston return spring (E-8P
valve: 23, E-10P
valve: 6) from the upper body. Use care so as not to
nick seats.
12. A small washer (24) will be found in the cavity of the
lower side of the primary piston (for E-8P
valve: 22,
for E-10P
valve: 2).
13. For E-8P
valve only: Disassemble the primary piston
by rotating the spring seat nut (25) counterclockwise.
Separate the spring seat nut, spring seat (26), and
rubber spring (27) and remove the piston o-ring (28).
14. Remove the large and small o-rings (30 & 31) from the
relay piston (20).
15. Remove the retaining ring (32) securing the primary
inlet and exhaust valve assembly (33) in the upper
body and remove the valve assembly.
CLEANING AND INSPECTION
1. Wash all metal parts in mineral spirits and dry.
2. Inspect all parts for excessive wear or deterioration.
3. Inspect the valve seats for nicks or burrs.
4. Check the springs for cracks or corrosion.
5. Replace all rubber parts and any part not found to be
serviceable during inspection, use only genuine Bendix
replacement parts.
ASSEMBLY
Prior to reassembling, lubricate all o-rings, o-ring grooves,
piston bores, and metal to metal moving surfaces with
Dow Corning 55 o-ring lubricant (Bendix piece number
291126).
Note: All torques speci ed in this manual are assembly
torques and can be expected to fall off, after assembly is
accomplished. Do not retorque after initial assembly torques
fall.
1. Install the primary inlet and exhaust assembly (33) in
the upper body and replace the retaining ring (32) to
secure it. Be sure the retaining ring is seated completely
in its groove.
2. Install the large and small o-rings (30 & 31) on the relay
piston (20).
3. For E-8P
valve only: Install o-ring (28) in the primary
piston (22) o-ring groove.
4. For E-8P
valve only: Install the rubber spring (do
not lubricate) (27), concave side down in the primary
piston (22) and place the spring seat (26), at side up,
over the rubber spring.
5. For E-8P
valve only: Install the primary piston spring
seat nut (25), with its hex closest to the spring seat, and
rotate clockwise until the top surface of the spring seat
is even with the top surface of the piston. Set aside.
6. Place relay piston spring (21) in concave portion of
relay piston (20) and install relay piston through primary
inlet/exhaust assembly (33) into under side of upper
body.
7. For E-10P
valve only: Install o-ring (4) on adapter (1)
and install adapter on upper body. Install o-ring (34) on
primary piston (2).
8. Place screwdriver, blade up, in vise. Insert stem (17)
through the relay piston upper body sub assembly, slide
this assembly over the blade of the secured screwdriver,
engage the screwdriver blade in the slot in the head of
the stem.
9. Place the washer (24) over the stem (17) and on top
of the relay piston (20).
10. Install primary return spring (E-8P
valve: 23, E-10P
valve: 6) in upper body piston bore.
11. For E-8P
valve only: Install the primary piston rubber
spring sub assembly (steps 4 & 5) over the stem, into
the upper body piston bore. For E-10P
valve: Install
primary piston sub-assembly (reference step 7).
12. Compress piston(s) (For E-8P
valve: the relay piston
(20), for E-10P
valve: the primary and relay pistons
(2 & 20)) and retaining ring into the upper body from
either side and hold compressed, either manually or
mechanically. See the cautionary note under step 8
in the Disassembly section of this manual.
13. Place the stem spring (19) (E-8P
valve: place over
the spring seat nut (25)), the spring seat (18) (concave
side up) and lock nut (16) on the stem (17). Torque to
20 - 30 inch pounds.
14. For E-8P
valve only: Install the primary piston
retainer (15) over the piston, making certain all three
lock tabs have engaged the outer lip of the body.
15. For E-10P
valve only: Install coil spring (5), spring
seat (7), and retaining ring (8) .
16. Replace the rubber seal ring (14) on the lower body.
17. Install the 4 hex head cap screws securing the
lower body to the upper body. Torque to 30 - 60 inch
pounds.
18. Install the secondary inlet and exhaust valve assembly
(13) on the lower body.
19. Install the screws that secure the exhaust cover (12) to
the lower body. Torque to 20 - 40 inch pounds.
20. Secure the screw (9) holding the exhaust diaphragm
(10) and the diaphragm washer (11) to the exhaust
cover (12). Torque to 5 - 10 inch pounds.
21. Install all air line ttings and plugs making certain thread
sealant material does not enter valve.
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