Working/lubrication/shift pressure, function - GF27.60-P-3024GGA
TRANSMISSION 722.902 in MODEL 463.306/336/346 up to 31.5.12 as of Model Year 2011/YoM 10
TRANSMISSION 722.904 in MODEL 463.202/222/236/237 up to 31.5.12 as of Model Year 2009/YoM 08
TRANSMISSION 722.902 in MODEL 463.303/340/341 up to 31.5.12 as of Model Year 2009/YoM 08
Function requirements for working/lubrication/shift pressure, general
- Circuit 87 ON
- Circuit 61 ON
Working/lubrication/shift pressure, general
The oil pressures are separated into:
- Working pressure
- Lubricating pressure
- Shift pressure
Working pressure
The oil pressure produced by the oil pump is converted into working pressure by the working pressure regulating valve. The level of working pressure depends on the position of the regulating valve and therefore on its geometry.
The position of the working pressure regulating valve is influenced by the working pressure control solenoid valve (VGS) (Y3/8y1) in a manner which is dependent on load and gear. All other pressures required for the transmission control are derived from the working pressure.
Lubricating pressure
At the working pressure regulating valve excess oil is diverted to the lubrication pressure regulating valve and from there used in a regulated manner for lubrication and cooling of mechanical transmission parts and the torque converter.
In addition the pressure in the torque converter is limited via the lubrication pressure.
Shift pressure
The shift pressure (pressure in the multi-disk clutch or in multi-disk brake) is derived from the working pressure.
The respective control solenoid valve influences the position of the associated regulating valve. In turn the position influences the pressure prevailing in the multi-disk brake or in multi-disk clutch. The pressure thus depends on the geometry of the respective regulating valve.