Oil Level Control, Function - GF27.10-D-3024H

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 

The oil level control seals the opening between the oil gallery and gear set chamber so that the rotating gear sets do not churn in the oil as the oil level increases. Power losses are reduced and oil is prevented from escaping from the transmission housing at high oil temperatures.