Haldex L31225 Instrucciones De Instalación

This document details the recommended assembly and
installation instructions for Haldex Trailer Brake Control
(TBC) Valves. Adherence to these instructions will ensure
a sound, leak-free installation of the valve.
OEM Service
Part No. Part No. Priority
N34031 KN26110 Service Brake
N34031A KN26120 Spring Brake
(2)
DELIVERY
CONTROL
RESERVOIR
WARNING: When working on air system components the
following precautions should be observed.
1. Stop engine when working under a vehicle. Always block
the vehicle wheels against a fore or aft roll. Bleeding off
system air pressure may cause the vehicle to roll. Keep
hands away from brake chamber push rods and brake
adjusters; they may apply as system pressure drops.
2. Never connect or disconnect a hose or line containing air
pressure. It may whip as air escapes. Never remove a
component or a pipe plug unless you are certain all system
air pressure has been exhausted.
3. Never exceed recommended working air pressure and
always wear safety glasses when working with air pressure.
Never look directly into component ports or direct a
pressurized air flow at anyone.
4. Never attempt to disassemble a component until you
have read and understood all recommended procedures.
Some components contain powerful springs and injury can
result if not properly disassembled. Use only proper tools
and observe all precautions pertaining to the use of those
tools.
Installation Instructions
Trailer Brake Control (TBC) Valve
Reservoir
Port
1/2"
1/2"
DELIVERY
SUPPLY
GENERAL: The TBC Valve is mounted on the trailer
reservoir. It reacts to a signal from the trailer supply line to
charge the tank and to control the spring brake section of
double diaphragm spring brakes to provide parking and
emergency braking. It is designed for use in all typical
Cover
commercial trailer air brake systems.
ID
PREPARING THE TRAILER FOR TBC VALVE
Black
INSTALLATION:
1. Block trailer wheels to prevent fore or aft roll.
White
2. Disconnect tractor/trailer hose couplings.
3. Drain all air reservoirs.
4. Locate valve to be replaced.
5. Carefully tag all air lines which are connected to the
valve being replaced.
a. Trailer Service (Control)
b. Trailer Supply (Emergency)
c. Delivery to Spring Brake Chambers.
INSTALLING THE TBC VALVE:
1. Lightly clamp the valve in the jaws of a vice against the
face of the four delivery ports.
2. Start the 1/2" thread of a heavy wall pipe nipple per SAE
J-530 into the reservoir port until finger tight. A fitting that
leans into the port indicates cross threading. Remove and
reinsert. Torque fitting to 350 - 500 lbs in. Remove the valve
from the vice.
3. Clamp the jaws of the vice against the hex of the steel
pipe nipple. Tighten securely.
4. Start fittings into each port as required. Torque to
100 - 150 lbs in. Remove the valve from the vice.
5. Thread the pipe nipple into the horizontal reservoir port.
6. Torque the assembly into the tank boss using the hex on
the steel pipe nipple. Torque to 200 lbs in. Continue to
tighten the valve until the part number label is up.
7. Connect hosing and tubing as needed to complete the
assembly.
WARNING: DO NOT OVER-TORQUE FITTINGS! Follow
recommended torque values to achieve the proper
fitting-to-TBC connection and avoid system leaks.
– Instructions continued on reverse side –
L31225
3/07