WABCO 400 500 320 0, Maintenance Manual

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120
Component Replacement
DANGER
You must use Schedule 80 pipe nipple (3/4-inch NPT) to nipple mount the ECU/Valve Assembly securely
to the air tank to avoid possible serious personal injury and damage to components.
7.3.2.1 Tank-Mounted
DANGER
You must use Schedule 80 pipe nipple (3/4-inch NPT) to mount the ECU/single modulator valve securely
to the air tank to avoid possible serious personal injury and damage to the components.
1. Use a 3/4-inch Schedule 80 hex nipple to attach ECU/single modulator valve assembly to a reinforced
air tank. Do not overtighten.
WABCO does not recommend use of a vise when installing the hex nipple. Use of a vise
may cause overclamping. Overclamping may damage the internal components of the ECU/
single modulator valve assembly.
2. Use a 3/4-inch pipe plug to plug unused supply port (Port 1). Apply SAE-standard, DOT-approved
paste-type thread sealant to all pipe threads beyond the fi rst two threads. Pipes with pre-applied
thread sealant may also be used.
3. Rotate and tighten the ECU/single modulator valve assembly until the exhaust port faces down and
the connection is secure. Use a torque wrench or ratchet with extension at the 3/4-inch pipe plug
installed on the front supply port (Port 1). Figure 7.7.
Fig. 7.7
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