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Automatic Transmission Hydraulic System
Automatic Transmission Hydraulic System
  The Hydraulic system is a complex maze of passages and tubes that sends transmission fluid under pressure to all parts of the transmission and torque converter.  The diagram below is a simple one from a 3-speed automatic from the '60s.  The newer systems are much more complex and are combined with computerized electrical components.  Transmission fluid serves a number of purposes including: shift control, general lubrication and transmission cooling.  Unlike the engine, which uses oil primarily for lubrication, every aspect of a transmission's functions are dependant on a constant supply of fluid under pressure.  This is not unlike the human circulatory system (the fluid is even red) where even a few minutes of operation when there is a lack of pressure can be harmful or even fatal to the life of the transmission.    In order to keep the transmission at normal operating temperature, a portion of the fluid is sent through one of two steel tubes to a special chamber that is  submerged in anti-freeze in the radiator. Fluid passing through this chamber is cooled and then returned to the transmission through the other steel tube.  A typical transmission has an average of ten quarts of fluid between the transmission, torque converter, and cooler tank.  In fact, most of the components of a transmission are constantly submerged in fluid including the clutch packs and bands.  The friction surfaces on these parts are designed to operate properly only when they are submerged in oil.

automatic transmission repair
2006
Hydraulic System
 
Transmission Repair
 
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