Bendix Commercial Vehicle Systems R-8P PRESSURE EQUALIZING PILOTRELAY - Manual (Page 4)

4 BW1660 © 2004 Bendix Commercial Vehicle Systems LLC. All rights reserved. 3/2004 Printed in U.S.A.
FIGURE 6 - CUTAWAY
9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
10. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
REMOVAL
1. Block or hold the vehicle by means other than the brakes.
2. Drain all air brake system reservoirs.
3. Identify, mark and disconnect all air lines from the R-8P
™
pilot relay valve.
4. Remove the R-8P ™ valve from its mount on the vehicle.
DISASSEMBLY OF VALVE (REFER TO FIG. 6)
1. Note and mark position of valve cover (6) to body (7).
2. Remove four 5/16"-18 hex screws and separate the cover
from the body (7).
3. Remove and discard sealing ring (3) from body (7).
4. Remove piston (8) and spring (9) from cover (6) and retain
all parts.
5. Remove and discard o-ring (2) from piston (8).
6. Remove screw (11), washer (12) and diaphragm (5) from
exhaust cover (10). Discard diaphragm (5).
7. Remove four 10-24 screws which secure exhaust cover
(10) to body (7).
8. Remove and discard inlet exhaust assembly (4) from
body (7).
9. Clean all remaining parts in a cleaning solvent equivalent
to mineral spirits. Make certain all surfaces, bores and
passages are clean and dry.
ASSEMBLY (REFER TO FIG. 6)
NOTE: Make certain both piston orifices are open and not
clogged. Grease all o-rings, o-ring grooves and bores
with a barium base lubricant.
1. Install diaphragm (5) and diaphragm washer (12) and
secure with screw (11). Torque screw to 15-25 inch
pounds.
2. Install inlet and exhaust valve assembly (4) in valve body
(7). Position exhaust cover assembly (10) so that all
holes are properly aligned and secure with four 10-24
screws. Torque screw to 20-30 inch pounds.
3. Install sealing ring (3) in valve body (7).
4. Install o-rings (1 and 2) on the piston (8).
5. Install spring (9) in valve cover (6) so that the large
diameter end of the spring will rest on the piston.
6. Install piston (8) (with its o-rings installed) in valve cover
(6). Note: Make certain spring (9) is centered and not
binding.
7. Install valve cover (6) on valve body (7) in same position
as marked in Step 1 of “Disassembly”. Secure the cover
to the body using four 5/16" hex head cap screws. Torque
to 120-150 inch pounds.
INSTALLATION
1. Mount the R-8P ™ valve to the vehicle using new bolts or
other hardware.
2. Connect air lines to the R-8P ™ valve using identification
made during Step 3 of “Removal” instructions.
3. Perform “Operation and Leakage Checks” before placing
vehicle in service.
1
9
8
2
3
SUPPLY
PORT
4
10
5
11 12
EXHAUST
DELIVERY PORTS
7
VENT
SERVICE
(CONTROL)
PORT
PISTON
ORIFICE
6