Troubleshooting guide

32
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The MV-3 dash control module is a two-button, push-pull
control valve housed in a single body which includes a
dual circuit supply valve and a check valve. The MV-3
valve can duplicate the functions of any existing two- or
three-valve push-pull system and has the advantage of
reduced plumbing.
The MV-3 module body, plungers and spools are made
out of a non-metallic, non-corrosive material. All air
connections are at the back of the module with the
exception of the optional auxiliary port.
The MV-3 module provides the following functions:
• Tractor Protection Control
• System Park
• Trailer Park Only
• Trailer Charge with Tractor Spring Brakes Applied
(Tractor Park Only)
• Supply Reservoir Selection
• Primary & Secondary Reservoir Connections
Trailer Control (TC) valves are hand-operated,
graduated control valves. The most common use of
trailer control valves is for independent control of trailer
service brakes, however, the valve can be used for any
application where graduated application pressure is
required.
These valves use a cam and spring mechanism to
control delivery air pressure and are available with
several different styles of body, clamp and handles.
Some models are available with self-returning handles.
Trailer control valves are often used to hold the
vehicle while the vehicle’s clutch and accelerator are
coordinated. The trailer control valve should never be
used for parking.
The Bendix
®
TCS-9000
™
control brake valve is
normally used to operate the trailer brakes independent
of the tractor brakes. It may be used, however, wherever a
hand-controlled pressure graduation function is desired.
It 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.
Dash Control Valves
The Bendix
®
MV-3
®
dash control module combines the
functions of a Bendix
®
PP-1
®
control valve and a Bendix
®
PP-7
™
trailer supply valve together into a unifi ed device.
Parking and Emergency Systems: Dash Control Valves
Bendix
®
TC-2
™
Trailer Control Valve
Bendix
®
TC-6
™
Trailer Control Valve
Bendix
®
TCS-9000
™
Trailer
Control Valve
Delivery
Delivery
Supply
#1
Exhaust
Port
Auxiliary
Delivery
Port
Tractor
Spring
Brakes
Supply
#2
Tractor
Service
Reservoir #2
Tractor
Protection
Valve
Tractor Service
Reservoir #1
View of Supply and Delivery Hoses Into a
Bendix MV-3 Dash Control Valve
Bendix
®
MV-3
®
Dash
Control
Module