Hydra-matic 4T40-E Transmission Repair Manual. The Hydra-matic 4T40-E Technician’s Guide is intended for automotive technicians that are familiar with the operation of an automatic transaxle or transmission. Technicians or other persons not having automatic transaxle or transmission know-how may find this publication somewhat technically complex if additional instruction is not provided. Since the intent of this book is to explain the fundamental mechanical, hydraulic and electrical operatmg principles, technical terms used herein are specific to the transmission industry. However, words commonly associated with the specific transaxle or transmission function have been defined in a Glossary rather than within the text of this book.
The Hydra-matic 4T40-E Technician’s Guide is intended to assist technicians during the service, diagnosis and repair of this transaxle. However, this book is not intended to be a substitute for other General Motors service publications that are normally used on the job. Since there is a wide range of repair procedures and technical specifications specific to certain vehicles and transaxle models, the proper service publication must be referred to when servicing the Hydra-matic 4T40-E transaxle.
Hie Hydra-matic 4T40-E Technician’s Guide is another Powertrain publication from the Technician’s Guide series of books. The purpose of this publication, as is the case with other Technician’s Guides, is to provide complete information on the theoretical operating characteristics of this transaxle. Operational theories of the mechanical, hydraulic and electrical components are presented in a sequential and functional order to better explain then-operation as part of the system.
In the first section of this book entitled “Principles of Operation”, exacting explanations of the major components and their functions are presented. In every situation possible, text describes component operation during the apply and release cycle as well as situations where it has no effect at all. The descriptive text is then supported by numerous graphic illustrations to further emphasize the operational theories presented.
The second major section entitled “Power Flow”, blends the information presented in the “Principles of Operation” section into the complete transaxle assembly. The transfer of torque from the engine through the transaxle is graphically displayed on a full page while a narrative description is provided on a facing half page. The opposite side of the half page contains the narrative description of thehydraulic fluid as it applies components or shifts valves in the system. Facing this partial page is a hydraulic schematic that shows the position of valves, checkballs, etc., as they function in a specific gear range.
The third major section of this book displays the “Complete Hydraulic Circuit” for specific gear ranges. Fold-out pages containing fluid flow schematics and two dimensional illustrations of major components graphically display hydraulic circuits. This information is extremely useful when tracing fluid circuits for learning or diagnosis purposes.
The “Appendix” section of this book provides additional transaxle information regarding lubrication circuits, seal locations, illustrated parts lists and more. Although this information is available in current model year Service Manuals, its inclusion provides for a quick reference guide that is useful to the technician.
Production of the Hydra-matic 4T40-E Technician’s Guide was made possible through the combined efforts of many staff areas within the General Motors Powertrain Division. As a result, the Hydra-matic 4T40-E Technician’s Guide was written to provide the user with the most current, concise and usable information available regarding this product.
- HOW TO USE THIS BOOK
- UNDERSTANDING THE GRAPHICS
- TRANSMISSION CUTAWAY VIEW (FOLDOUT)
- GENERAL DESCRIPTION
- PRINCIPLES OF OPERATION
- MAJOR MECHANICAL COMPONENTS (FOLDOUT)
- RANGE REFERENCE CHART
- TORQUE CONVERTER
- APPLY COMPONENTS
- PLANETARY GEAR SETS
- HYDRAULIC CONTROL COMPONENTS
- ELECTRONIC CONTROL COMPONENTS
- POWER FLOW
- COMPLETE HYDRAULIC CIRCUITS
- LUBRICATION POINTS
- BUSHING, BEARING & WASHER LOCATIONS
- SEAL LOCATIONS
- ILLUSTRATED PARTS LIST
- BASIC SPECIFICATIONS
- PRODUCT DESIGNATION SYSTEM
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