Transmission Oil Cooling, Function - GF27.55-D-2000HAG

TRANSMISSION 722.9 in MODEL 906 

Function requirements for transmission oil cooling, general 

• "Circuit 87 ON"
• "Circuit 61 ON" (Engine running)

Transmission oil cooling, general 

Transmission oil cooling lowers the temperature of the transmission oil and thus prevents overheating damage in the transmission.

Function sequence for transmission oil cooling 

The transmission oil is sucked out of the transmission oil pan by the primary pump (mechanical crescent-type pump) and pumped via the feed to the transmission oil thermostat. At a transmission oil temperature <90 °C, the transmission oil thermostat directs the transmission oil back to the transmission via the return.

At a transmission oil temperature >90 °C, the transmission oil thermostat opens and the transmission oil flows through the transmission oil cooler, before it flows back through the return to the transmission.