GF27.60-D-5142H Command Valve, Component Description

GF27.60-D-5142H Command Valve, Component Description
- TRANSMISSION 722.6






2a Valve body of shift plate
2b Valve body of shift plate
31a 1-2/4-5 command valve
31b 2-3 command valve
31c 3-4 command valve

Location

A command valve belongs to each shift group. The 1-2/4-5 command valve and 2-3 command valve are installed in the shift plate valve housing. The 3-4 command valve is installed in the shift plate valve body.

Task

The command valves switch the shift groups from the steady-state phase into the shift phase and back.





Shown: 1-2/4-5 command valve

Steady-state phase (multidisk brake B1 engaged, multidisk clutch K1 disengaged)

21 Multidisk brake B1
24 Multidisk clutch K1
31 Command valve

p-A Working pressure
p-S Shift pressure





Shown: 1-2/4-5 command valve

Shift phase (multidisk brake B1 disengaging, multidisk clutch K1 engaging)

21 Multidisk brake B1
24 Multidisk clutch K1
31 Command valve

p-A Working pressure
p-S Shift pressure
p-SV Shift valve pressure
p-U Overlap pressure

Function

When the end face is depressurized (steady-state phase) the operating pressure is lead to the actuator operated.

If shift valve pressure is applied to the end face of the command valve (shift phase), then the shift pressure is switched through to the engaging element and overlap pressure is switched through to the disengaging actuator.