Bendix Commercial Vehicle Systems SRC-7000 TRAILER SPRING BRAKE VALVE - Manual (Page 6)

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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 speci
fi 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 speci
fi 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 Antilock 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.
PREVENTIVE MAINTENANCE
Important:
Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A
warranty may be voided if intrusive maintenance is
performed during the warranty period.
No two vehicles operate under identical conditions, as
a result, maintenance intervals may vary. Experience is
a valuable guide in determining the best maintenance
interval for air brake system components. At a minimum,
the Bendix ® SRC-7000 ™ trailer spring brake valve should
be inspected every 6 months or 1500 operating hours,
whichever comes fi rst, for proper operation. Should the
SRC-7000 ™ valve not meet the elements of the operational
tests noted in this document, further investigation and
service of the valve may be required.
SERVICE CHECKS
1. Remove any accumulated contaminants. Visually
inspect the valve’s exterior for excessive corrosion or
physical damage. Replace the valve as necessary.
2. Inspect all air lines connected to the valve for signs
of wear or physical damage. Repair or replace as
necessary.
3. Test air line fi ttings for excessive leakage and tighten
or replace as necessary.
OPERATIONAL AND LEAKAGE TESTS
Check the tractor dash gauge against a gauge known to be
accurate before performing these tests. Connect the tractor
air lines to the trailer on which the SRC-7000
™ valve is to
be tested. Block all wheels or hold the vehicles by means
other than the air brakes.
1. Install a gauge in the trailer reservoir(s). Build the
tractor and trailer to full system pressure by placing
the park control valve and the trailer air supply valve
in the charge position. As system pressure reaches
approximately 75-95 psi, the trailer spring brakes
should also build up to approximately 75-95 psi before
the reservoir(s) begin to charge.
2. When full system pressure is reached, and the spring
brakes are fully released, apply a soap solution to
the SRC-7000
™ valve exhaust port and the vent. A 1"
bubble in 5 seconds is permissible.
3. Place the trailer air supply valve in the exhaust position.
The spring brakes should apply. Disconnect the trailer
supply line and apply a soap solution to check for leaks.
A 1" bubble in 5 seconds is permissible.
4. Reconnect the trailer supply hose coupling and
recharge the trailer system. The spring brakes should
release. Shut off the engine and then open the trailer
reservoir drain cock. The tractor air system should bleed
down to approximately 70 psi. The trailer spring brakes
should remain released.
5. If the SRC-7000 ™ valve does not function as described;
or if leakage is excessive, repair the valve, or replace
with a genuine Bendix
® service replacement valve.
Leakage through the welds is acceptable.
REMOVAL
1. Identify and mark or label all air lines and their
connections on the SRC-7000 ™ valve. Then disconnect
the air lines.
2. Remove the SRC-7000 ™ valve from the reservoir.
INSTALLATION
1. Install the SRC-7000 ™ valve on the reservoir.
2. Reconnect all air lines to the valve using the identi fi cation
made in REMOVAL step 1.
3. Install all fi ttings 2 to 2-1/2 turns past fi nger tight.
4. Perform OPERATIONAL AND LEAKAGE TESTS before
placing the vehicle back in service.
BW2739 © 2010 Bendix Commercial Vehicle Systems LLC. All rights reserved. 08/2010 Printed in U.S.A.
Printed on recycled paper