TAILIEUCHUNG - Automatic Transmissions P16

Valve body circits | Section 3 Valve Body Circuits Lesson Objectives 1. 2. Describe the function of pressure control valves. Describe the function of shift control valves. 3. Describe the function of timing sequential valves. 4. Describe the function of pressure modulating valves. 5. Explain the effect that throttle pressure and governor pressure have on the shift valves and clutch application. Automatic Transmission Diagnosis - Course 273 Section 3 1 -- M Jti s TOYOTA Technical Training Valve Body Circuits Valve Body The valve body consists of an upper valve body a lower valve body a Introduction manual valve body and various covers. The body halves are separated by a separator plate which contains openings that control the flow of fluid between valve circuits. The valves control fluid pressure and switch fluid from one passage to another. Hydraulic circuits extend to the transmission housing and are connected either by direct mounting or through oil tube passages. The valves are a precision fit to their bore in the body and their position in the bore is determined by a balance between spring tension and hydraulic pressure. Hydraulic pressure within the valve body will vary based on throttle position or pressure modulating valves. In the case of a non-ECT transmission pressure also varies based on vehicle speed through the governor valve. In order to understand what the many valves do in the valve body they have been separated by function as listed below Pressure control valves Hydraulic control valves Timing Sequencing valves Pressure modulating valves Valve Body The body halves are separated by a separator plate which contains openings that control the flow of fluid between valve circuits. Automatic Transmission Diagnosis - Course .

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