Bendix Commercial Vehicle Systems SS-1 SHUT OFF VALVE - Manual (Page 3)

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mode. When using the SS-1 ™ shut-off valve in this
manner, the control signal ramp rate should be limited
by orifi cing or other methods. Please contact Bendix
®
Engineering with specifi c application requirements.
PREVENTIVE MAINTENANCE
Important: Review the Bendix ® Warranty Policy before
performing any intrusive maintenance procedures.
The 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 SS-1
™ valve should be inspected every 6 months or
1500 operating hours, whichever comes fi rst, for proper
operation.
Should the SS-1 ™ valve not meet the elements of
the operational tests noted in this document, further
investigation and service of the system or valve may be
required.
If the SS-1 ™ valve fails to function as described or leakage
is excessive, it should be replaced with a genuine Bendix ®
service unit of the same part number, available at Bendix ®
authorized parts outlets.
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. Always wear
safety glasses.
1. Park the vehicle on a level surface, apply the parking
brakes, and always block the wheels.
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 an AD-lS
® 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 ® 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 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.
OPERATING AND LEAKAGE TESTS
OPERATING TESTS
General
Two accurate air gauges are necessary to perform these
tests. Depending upon installation, it may be necessary to
remove the valve to properly test it. When testing valves
installed in an automatic application the correct opening
pressures of the valve should be known before beginning
tests; consult vehicle manual. Refer to fi gure 3 and use the
appropriate Operational test.
Pilot
1. Install an accurate gauge in the supply line and the
other gauge in the delivery line.
2. With full system pressure present at the supply port of
the SS-1 ™ valve, apply and release full system pressure
to the control port and note that delivery pressure
increases to supply port pressure with no perceptible
lag.