12
Installation
5
Installation
5.1
Install the ECU/Single Modulator Valve Assembly
The assembly may be mounted on the air tank or on the cross member of the vehicle.
5.1.1
Tank-Mounted
WARNING
You must use a Schedule 80 hex nipple (3/4-inch NPT) to mount the ECU/single modulator valve
assembly securely to the air tank to avoid possible serious personal injury and damage to the
component.
Use a 3/4-inch NPT Schedule 80 hex nipple to attach the ECU/single modulator valve assembly to a re-
inforced air tank. Apply SAE-standard, DOT-approved sealing paste to either the first few threads or over
the whole length. Hand-tighten it with a minimum of 2.5 turns.
Note if a minimum of 2.5 turns cannot be
achieved, remove and inspect.
6. Use a 3/4-inch NPTF pipe plug to plug the unused supply port (Port 1). Apply SAE-standard, DOT-
approved sealing paste to either the first few threads or over the whole length. Pipes with pre-applied
thread sealant may also be used.
7. Rotate and tighten the ECU/single modulator valve assembly a minimum of 3 turns and verify the
exhaust port faces DOWN and the connection is secure. Use a torque wrench on the 3/4-inch pipe
plug installed on the front supply port to verify the valve is tightened to 59-148 lb-ft (80-200 Nm).
4014000b
POWER SUPPL
Y
ABS SENSOR
D
ABS SENSOR C
PLUG
UNUSED
PORT
SCHEDULE
80 HEX
NIPPLE
Rear of assembly
faces
air tank.
Exhaust
port
must face
DOWN.
AIR TANK
5.1.2
Bracket-Mounted to Cross Member of Vehicle
1.
Install a 3/4-inch NPT fitting in the supply port (Port 1). Use a 3/4-inch NPT pipe plug to plug the
unused supply port (Port 1). Apply SAE-standard, DOT-approved sealing paste to either the first few
threads or over the whole length. Pipes with pre-applied thread sealant may also be used.
