PREVOST X3-45 Multiplex, Maintenance Manual

Page: 673 / 1422

4 Component Replacement
39
Meritor WABCO Maintenance Manual MM-0112 (Revised 07-05)
ATC Valve on the Rear ABS Valve Package
Removal
NOTE: If there is enough room to work, it is not necessary to
remove the valve package from the vehicle before replacing the ATC
valve. If the valve package must be removed, follow the instructions
for removing and replacing the ABS Valve Package that appear in
this section of the manual.
When installing the new ATC valve on the valve package, you must
use the new O-rings, seals, mounting bolts and lubricant included
with the replacement kit.
1. Turn the ignition switch to the OFF position. Apply the parking
brake.
2. Place blocks under the front and rear tires to stop the vehicle
from moving.
3. If necessary, raise the vehicle off the ground. Place safety
stands under the axle.
4. Relieve line pressure by bleeding the air from the
appropriate supply tank.
5. Disconnect the wiring from the ATC valve.
6. Disconnect the supply air line from the adapter and the treadle
air line from the ATC valve.
7. Use a 5 mm Allen wrench to remove the two screws that hold
the adapter piece to the relay valve portion of the valve
package.
Use a 6 mm Allen wrench to remove the two mounting bolts
that hold the ATC valve to the adapter piece. Remove the ATC
valve from the adapter piece. Remove the ATC valve.
Remove the adapter piece, seal and O-rings from the valve
package. Figure 4.10.
Figure 4.10
Installation
1. Clean and lubricate the small adapter piece O-ring. Install the
O-ring on the adapter piece.
Use the two new M8 Allen-head bolts to attach the ATC valve
to the adapter piece. Use a 6 mm Allen-head tool to tighten to
13-15 lb-ft (18-20 N
폷
m). Figure 4.11.
@
Figure 4.11
Figure 4.10
Figure 4.11
1002042a
MOUNTING BOLTS
SEAL
O-RINGS
ADAPTER
SUPPLY
AIR LINE
ATC
VALVE
TREADLE
AIR LINE
1002043a
MOUNTING BOLTS
12-13 LB-FT (18-20 N m) •
SEAL
ADAPTER
O-RING
ATC
VALVE