WABCO 400 500 320 0, Maintenance Manual

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Component Replacement
7.3.2.3 Mounted to Cross Member of Vehicle — 2S/2M, 4S/3M Standard and Premium Mounting
Bracket Not Supplied
1. Install a 3/4-inch NPT fi tting in supply port. Use a 3/4-inch pipe plug to plug unused supply port
(Port 1). Figure 7.9.
 Apply SAE-standard, DOT-approved sealing paste to either the fi rst few threads or over the whole
length. Pipes with pre-applied thread sealant may also be used.
Fig. 7.9
ECU/DUAL MODULATOR VALVE MOUNTED
TO A CROSS MEMBER OF THE VEHICLE WITH
CONTROL PORT FACING FRONT OF TRAILER
FRONT OF
TRAILER
ECU/DUAL MODULATOR VALVE MOUNTED WITH
CONTROL PORT FACING REAR OF TRAILER
FRONT OF
TRAILER
Exhaust
port
must face
DOWN.
Plug all unused
ports.
Exhaust
port
must face
DOWN.
Plug all
unused ports.
CONTROL
PORT
CONTROL
PORT
4014264a
2. Locate a position for mounting the assembly to the vehicle cross member midway between the side
rails, close to the brake chambers the valve serves.
 Drill two 3/8-inch mounting holes. The distance between the two holes (O.D.) must be
3-13/16-inches (97.2 mm) and mount directly to the cross member.
OR
 Build a mounting bracket with two 3/8-inch mounting holes spaced 3-13/16-inches (97.2 mm) O.D.
apart.
3. Connect the air lines to the ports. Follow the label markers installed when the air lines were
disconnected.
4. Connect the sensor cables, external relay valve cable (if used), and power cable to the ECU/Valve
Assembly. Use the black protective connector caps included with the replacement assembly to cover
unused cable connections.
5. Perform End of Line Check before returning the trailer to service.