Chapter 1 Introduction to Automatic Transmissions and Transaxles 15
Manual control lever
Control shaft
Steering wheel
and column
Accelerator
cross shaft
To carburetor
Clutch
shaft
Head gear set
Governor
Throttle control
hydraulic relay
Throttle controlled
compensator valve
Manual
valve
Front unit valve
Front servo
Rear servo
Rear planetary unit
Front planetary unit
Secondary oil pump
Primary oil pump
Pressure regulating valve
Main shaft
Figure 1-5. Diagram of an early Oldsmobile automatic transmission. A clutch was used to engage the transmission when the
vehicle was started from a stop.
Figure 1-6. Cross-section of a Cadillac Hydra-Matic transmission. This transmission used a fluid coupling instead of a clutch.