Bendix Commercial Vehicle Systems SR-7 SPRING BRK MOD VLV 1/11 - Manual (Page 8)

8
LEAKAGE TEST
Place the park control valve in the “release” position; using
a soap solution, coat all ports including the exhaust port. A
1" bubble in 3 seconds is permitted (175 SCCM).
If the valve does not function as described, or if leakage
is excessive, it is recommended that it be replaced with a
new or remanufactured unit available from a Bendix parts
outlet. DO NOT ATTEMPT TO DISASSEMBLE THE
SR-7
® VALVE. THE VALVE CONTAINS HIGH SPRING
FORCES THAT COULD RESULT IN PERSONAL INJURY
IF DISASSEMBLY IS ATTEMPTED!
SERVICING THE SR-7 ® VALVE
GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO AVOID PERSONAL
INJURY OR DEATH:
WHEN WORKING ON OR AROUND A VEHICLE, THE
FOLLOWING GENERAL PRECAUTIONS SHOULD BE
OBSERVED AT ALL TIMES.
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3. Do not attempt to install, remove, disassemble
or assemble a component until you have read
and thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4. If the work is being performed on the vehicle’s
air brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning ANY work
on the vehicle. If the vehicle is equipped with a
Bendix
® AD-IS ® air dryer system or a dryer reservoir
module, be sure to drain the purge reservoir.
5. Following the vehicle manufacturer’s recommended
procedures, deactivate the electrical system in a
manner that safely removes all electrical power
from the vehicle.
6. Never exceed manufacturer’s recommended
pressures.
7. Never connect or disconnect a hose or line
containing pressure; it may whip. Never remove
a component or plug unless you are certain all
system pressure has been depleted.
8. Use only genuine Bendix ® brand replacement parts,
components and kits. Replacement hardware,
tubing, hose, fi ttings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifi cally for such applications and
systems.
9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifi cally 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.
11. For vehicles with Automatic Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a drive
axle are lifted off the ground and moving.
VALVE REMOVAL
1. Prior to removing the SR-7 ® valve, apply the parking
brakes and drain all the vehicle reservoirs.
2. Identify all air lines before disconnecting.
3. Remove the two mounting nuts that secure the valve
to the frame rail and remove the valve.
VALVE INSTALLATION
1. Align the mounting studs with the mounting holes on
the vehicle frame rail. Tighten the mounting nuts to
180-220 in. lbs.
2. Install the valve onto the vehicle ensuring all ports are
connected as marked during disassembly.
TESTING THE REPLACEMENT SR-7 ® SPRING
BRAKE MODULATING VALVE
Perform operating and leakage tests as outlined in
“Operating Tests” section.
BW2271 © 2011 Bendix Commercial Vehicle Systems LLC 1/2011. Printed in U.S.A. All rights reserved.