Shift Valve, Component Description - GF27.60-D-5141HA
Transmission 722.6 in MODEL 906.111/113/131/133/135/153/155/211/213/231/233/235/253/255/611/613/631/633/635/637/653/655/657/711/713/731/733/735
Holding pressure shift valve
Location
A holding pressure shift valve belongs to each shift group.
The 1-2/4-5 holding pressure shift valve and 2-3 holding pressure shift valve 2-3 are installed in the shift plate valve housing, the 3-4 holding pressure shift valve is installed in the shift plate valve body.
Task
Each holding pressure holding pressure shift valve assigns the working pressure to an actuator of a shift group.
Basic condition (one actuator engaged)
Switch status
Function
The holding pressure shift valve is engaged by the pressures applied to the end face in the actuators and by spring force. It assigns the working pressure to the actuator with the higher pressure (taking into account the spring force and the effective area).
The other element of the shift group is then unpressurized. A changeover of the holding pressure shift valve only takes place during the shift phase and only at a particular pressure ratio of overlap pressure to shift pressure.