AIR SYSTEM AND BRAKES
CENTERSHI FT CONTROL VALVE
1. Lever. 2. Detent. 3. Ear. 4. Ear. 5. Piston. 6.
17. Differential unlock indicator light. 18. Toggle switch
Piston. 7. Exhaust port. 8. Exhaust port. 9. Spring.
mounted on operators console. 19. Electric solenoid
10. Spring. 11. Delivery port. 12. Delivery port. 13.
valve located on differential and bevel gear housing.
Valve. 14. Spring. 15. Valve. 16. Spring. 17. Supply
port. 18. Plug. 19. Passage in piston (5). 20. Spring.
CENTERSHIFT CONTROL VALVE
21. Housing for detent. 22. Passage in piston (6).
Pressure air goes through supply port (17) of the
From the RETRACT position, lever (1) is first moved
centershift control valve to the spring side of valve (13).
back to the INDEX position. This releases this pressure
The pressure air then goes around housing (21) to the
in delivery port (11) through exhaust port (7) when piston
spring side of valve (15). In the INDEX position, no
(5) moves back to its original position. The lever is then
pressure air is available to either delivery ports (11) or
pulled to the LOCK position. Ear (3) on the lever turns to
(12). The delivery ports are open to the exhaust ports
move piston (6) down. Delivery port (12) is then opened
through passages (19) and (22) in pistons (5) and (6).
to the supply port in the same way as delivery port (11) in
Detent (2) holds lever (1) in the correct position.
the RETRACT position. Pressure air goes out delivery
port (12) to push the lock pin back into the lock plate. In
In the RETRACT position, lever (1) is pushed forward.
this position delivery port (11) is open to exhaust port (7)
Ear (4) on the lever turns to move piston (5) down.
through passage (19) in piston (5). Detent (2) will also
When piston (5) comes into contact with valve (13), the
hold the lever in this position.
opening to exhaust port (7) is closed. The piston then
moves valve (13) off its seat. This opens a passage to
let pressure air from the supply port go around valve (13)
to delivery port (11). Pressure air then goes out delivery
port (11) to the centershift lock pin to push the pin out of
the lock plate. Delivery port (12) is still open to exhaust
port (8) through passage (22) in piston (6). Detent (2)
holds the lever in the correct position.