GF27.60-D-5141HB Shift Valve, Component Description

GF27.60-D-5141HB Shift Valve, Component Description
- TRANSMISSION 722.6


Shift pressure shift valve





2a Valve body of shift plate
2b Valve body of shift plate
29a 1-2/4-5 shift pressure shift valve
29b 2-3 shift pressure shift valve
29c 3-4 shift pressure shift valve

Location

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

Task

Each shift pressure shift valve assigns the corresponding shift pressure to an engaging actuator. Simultaneously the overlap pressure regulated by the overlap pressure regulating valve is assigned to the actuator to be disengaged.





Shown: 1-2/4-5 shift pressure shift valve

Multidisk brake engaging, multidisk clutch disengaging

0 Oil sump drain
29 Shift pressure shift valve
31 Command valve
67 Multi-disk clutch
68 Multi-disk brake

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





Shown: 1-2/4-5 shift pressure shift valve

Multidisk brake disengaging, multidisk clutch engaging

0 Oil sump drain
29 Shift pressure shift valve
31 Command valve
67 Multi-disk clutch
68 Multi-disk brake

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

Function

Working pressure is applied to the shift pressure shift valve on the end face via the command valve. Its shift condition is retained in the shift phase, meanwhile the variable shift pressure acting on the end face during the shift phase is replaced by a corresponding constant pressure.

When the multidisk clutch is engaged the end face of the shift pressure shift valve is unpressurized during the steady-state and shift phase, the shift condition also being retained here during the shift phase.