Chapter 03 - Chapter 3 General Theories of Operation...

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Chapter 3 General Theories of Operation Diagnosis, Maintenance, and Basic Adjustments Upon completion and review of this chapter, the student should be able to: 17
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Classroom Manual Objectives List the factors that determine when an automatic transmission will automatically shift. Describe the four basic systems of all automatic transmissions. Describe the operation and purpose of a torque converter. Explain Pascal’s Law and how it applies to the operation of an automatic transmission. Explain the basic operation of hydraulic machines. Identify the major components in a transmission’s hydraulic circuit and describe how they provide fluid flow and pressurization. List the various types of reaction members commonly used in automatic transmissions. Describe the purpose of a transmission’s valve body. List and describe the various load-sensing devices used in an automatic transmission's hydraulic system. Describe the basic construction of automatic transmission housings, including the purpose of the various mechanical and electrical connections. Shop Manual Objectives Listen to the driver’s complaint, road test the vehicle, and then determine the needed repairs. Diagnose unusual fluid usage, level, and condition problems. Replace automatic transmission fluid and filters. Diagnose noise and vibration problems. Diagnose electronic, mechanical, and vacuum control systems. Inspect, replace, and align power train mounts. Inspect, adjust, and replace vacuum modulator, lines, and hoses. Diagnose mechanical and vacuum control systems; determine needed repairs. Perform oil pressure tests; determine needed repair. Inspect, adjust, and replace manual valve shift linkage. Inspect, adjust, and replace cables or linkages for throttle valve (TV) kickdown and accelerator pedal. Inspect and replace external seals and gaskets while the transmission is in the vehicle. Inspect, repair, and replace extension housing. Inspect and replace speedometer drive gear, driven gear, and retainers while the transmission is in the vehicle. Inspect and replace parking pawl, shaft, spring, and retainer while the transmission is in the vehicle. Adjust bands. 18 Instructor’s Guide to Accompany Today’s Technician: Automatic Transmissions & Transaxles 3E
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Overview This chapter in both manuals covers the general theory of operation of an automatic transmission, discussing all the basic parts. The chapters also cover the method of identification, diagnostic procedures, and identification of the cause of oil leaks. They cover basic service and repair procedures. Reading Assignments Classroom Manual, pages 45-79 Shop Manual, pages 71-112 Terms to Know Accumulator Aeration Belleville spring Check ball valves Dynamic pressure Engine vacuum Flow chart Flow-directing valves Gear-type pump Governor Impeller Input shaft Kickdown Kickdown switch Manual shift valve MAP sensor Mechanical advantage
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Chapter 03 - Chapter 3 General Theories of Operation...

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