Bendix Commercial Vehicle Systems TCS-9000 User Manual

®

Bendix® TCS-9000™ Control Brake Valve

SD-03-3674

HANDLE

CAM

CAM

FOLLOWER

1/4" PTC

EXHAUST

3/8" PTC

DELIVERY

3/8" PTC

SUPPLY

HORIZONTAL PORTS

FIGURE 1 TCS-9000™ trailer control valve configurations

DESCRIPTION

The Bendix® TCS-9000™ control brake valve is normally used
to operate the trailer brakes independently of the tractor
brakes. It may be used, however, wherever a hand controlled
pressure graduation function is desired.

The TCS-9000™ valve is handle operated and is designed for
dash or panel mounting. It is not designed for use as a
parking brake control and should never be used to hold the
brakes applied when the operator leaves the vehicle.

OPERATION

APPL YING

When the handle is pulled through its 55° arc, the cam is
rotated accordingly . The cam action forces the cam follower
downward, compressing the graduation spring and creating
a force on the plunger which depresses the inlet valve and
delivers air under pressure to the delivery port.

GRADUATION

SPRING

EXHAUST

PLUNGER

DELIVERY

SUPPLY

FIGURE 2 TCS-9000™ valve sectional

INLET VALVE

HOLDING

As delivery pressure builds up in the delivery port, it is also
effective under the plunger causing it to balance the force of
the graduation spring until the inlet valve is seated against
its seat in the body and is also seated against the plunger ,
thus preventing the delivery air from exhausting through the
center of the plunger, maintaining the desired pressure in
the delivery line.

RELEASING

When the handle is released or moved to its release position,
the cam follower is permitted to rise, opening the exhaust
passage and allowing the air pressure in the delivery line to
exhaust out the exhaust port.

1

PREVENTIVE MAINTENANCE

Important: The TCS-9000™ control brake valve is not

serviceable.
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
TCS-9000™ valve should be inspected every 6 months or
1500 operating hours, whichever comes first, for proper
operation. Should it not meet the elements of the operational
tests noted in this document, further investigation and
replacement of the valve may be required.

REMOVING AND INSTALLING

Secure the vehicle with spring brakes or blocks. Drain the
reservoir which supplies the TCS-9000
fasteners which secure the mounting bracket to the panel.
Mark and disconnect the connecting air lines. Remove the
valve.

INSTALLING

A typical piping arrangement for the TCS-9000
shown in Figure 3. Check connecting air lines for integrity
and foreign material. Replace the lines if necessary.
Re-connect the air lines. Replace fasteners securing bracket
to panel. Check operation of valve by charging system and
performing the service check as described in this manual.

™

valve. Remove the

™

valve is

SERVICE CHECKS

OPERA TING

When used as a trailer control valve connect an accurate
test gauge to the trailer service line hose and leave the trailer
emergency or supply hose connected to the trailer or if a
trailer is not available, connect the trailer supply hose to an
unvented dummy coupling or to a plugged hose fitting. The
trailer supply valve should be in the normal position.

The exhaust valve closes when the operating lever is moved
from 0° to 15° and no pressure is delivered. With 15° to 40°
of handle travel the valve delivers proportional intermediate
pressures up to 40psi.

With the valve fully applied, leakage at the exhaust line
should not be greater than 175 SCCM (1" bubble in 3
seconds).

If the valve does not function as described, or if the leakage
is excessive, it is recommended that it be returned to the
nearest Bendix authorized distributor for a service
replacement.

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 an AD-IS
air dryer system or a dryer reservoir module, be
sure to drain the purge reservoir.

®

In the fully applied position, up to 55° of handle travel, the
gauge should register full reservoir pressure. Upon release,
the gauge should immediately register zero.

The location of the atmospheric end of the exhaust line from
the valve should be found, probably in the engine
compartment.

With the TCS-9000™ valve in the release position, no pressure
should register on the test gauge and leakage at the end of
the exhaust line should not be greater than 100 SCCM
(1" bubble in 5 seconds).

2

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.