GF27.55-P-2000AHC Transmission Oil Cooling, Function

GF27.55-P-2000AHC Transmission oil cooling, function
- Transmission 722.902/904/906/908


Function requirements
^ Circuit 87 ON
^ Circuit 61 ON

General
To reach the operating temperature of the transmission quicker, the transmission oil is heated by the engine's cooling circuit. Transmission oil cooling lowers the temperature of the transmission oil and thus prevents overheating damage in the transmission.

Function sequence
The transmission oil is drawn out of the transmission oil pan by a mechanical pump in the transmission and is pumped via the feed to the transmission oil heat exchanger (which is integrated in the engine radiator). The transmission oil then flows through the return line back to the transmission.

On vehicles with an additional transmission oil cooler the transmission oil flows from the transmission oil heat exchanger to the transmission oil thermostat.

At a transmission oil temperature less than 90 degrees C, the transmission oil thermostat directs the transmission oil back to the transmission via the return.

At a transmission oil temperature ≥90 degrees C the transmission oil thermostat opens and the transmission oil flows through the additional transmission oil cooler before it flows back to the transmission through the return.