GF27.60-P-5220ACM Holding Pressure Shift Valve, Component Description

GF27.60-P-5220ACM Holding pressure shift valve, component description
- TRANSMISSION 722.643/649
- refinement package
- as of model year 09

Component Identification:

Location
A holding pressure shift valve belongs to each shift group.

The 1 - 2 or 4 - 5 holding pressure shift valve and 2 - 3 holding pressure shift valve are installed in the valve body, the holding pressure shift valve 3 - 4 is installed in the valve housing of the valve body assembly.

Task
Each holding pressure holding pressure shift valve assigns the working pressure to an actuator of a shift group.








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.