Chapter 07 - Chapter 7 Hydraulic Circuits and Controls Upon...

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Chapter 7 Hydraulic Circuits and Controls Upon completion and review of this chapter, the student should be able to: 47
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Classroom Manual Objectives Describe the design and operation of the hydraulic controls and valves used in modern transmissions and transaxles. Describe the basic types of valves used in automatic transmissions. Describe the various configurations of a spool valve and explain how it can be used to open and close various hydraulic circuits. Explain the role and operation of the following components of the transmission control system: pressure regulation valve, throttle valve, governor assembly, manual valve, shift valves, and kickdown assembly. Describe the operation of the main pressure regulator valve. Describe how fluid pressure can be controlled by a solenoid. Describe the different designs of a governor and explain the operation of each type. Explain why load-sensing devices are necessary for automatic transmission efficiency. Identify the various pressures in the transmission and explain their purpose in the total functioning of the transmission. Describe the purpose of a transmission’s valve body. Trace through the oil circuit for a transmission and describe where the fluid flows in each transmission range. Shop Manual Objectives Remove and install the valve body from common transmissions. Check valve body mating surfaces. Inspect and measure valve body bores, springs, sleeves, retainers, brackets, check balls, and screens. Inspect and replace valve body spacers and gaskets. Check and/or adjust valve body bolt torque. Inspect and replace governor cover and seals. Inspect, adjust, repair, and replace governor sleeve, valve, weights, springs, retainers, and gear. Overview This chapter in both manuals discusses hydraulic systems and apply devices. They include the theory and service of the various valves used in today’s transmissions. 48 Instructor’s Guide to Accompany Today’s Technician: Automatic Transmissions & Transaxles 3E
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Reading Assignments Classroom Manual, pages 195-245 Shop Manual, pages 297-316 Terms to Know Ball-type valve Carburetor cleaner Hybrid valve Lands Manual shaft Manual valve Needle check valve Oil circuit Orifice Poppet valve Pressure-regulating valve Reaction area Relay valve Relief valve Separator plate Shift valve Solenoid/pressure switch Spool valve Throttle valve Transfer plate Transmission fluid pressure switch Two-way check valve
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Chapter 07 - Chapter 7 Hydraulic Circuits and Controls Upon...

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