Title Automatic Transmission 4ET50 Tech Guide 2-2011.pdf ✅

February 2011 GENERAL MOTORS LLC 2M Litho in U.S.A. 4ET50 TECHNICIAN'S GUIDE 5765EK.12-0111 4ET50-H-TG 4ET50 TECHNICIAN'S GUIDE CYAN MAGENTA YELLOW BLACK

PREFACE All information contained in this book is based on the latest data available at the time of publication approval. The right is reserved to make product or publication changes, at any time, without notice. No part of any GM Powertrain publication may be reproduced, stored in any retrieval system or transmitted in any form or by any means, including but not limited to electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Powertrain Group of General Motors LLC. This includes all text, illustrations, tables and charts. ©COPYRIGHT 2011 POWERTRAIN GROUP General Motors LLC ALL RIGHTS RESERVED The 4ET50 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 operating 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 4ET50 Technician’s Guide is also intended to assist technicians during the service, diagnosis and repair of this transmission. 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 transmission models, the proper service publication must be referred to when servicing the 4ET50 transmission. 1
4ET50 2 CONTENTS Introduction.......................................................................................................... 3 How To Use This Book .......................................................................................... 4 Understanding The Graphics .......................................................................... 6 Transmission Cutaway View (Foldout)......................................................... 8 General Description .......................................................................................... 9 Principles Of Operation.................................................................................. 10 Major Mechanical Components (Foldout)..................................... 10 Range Reference Chart......................................................................... 11 Torque Dampener Assembly ................................................................. 12 Apply Components .................................................................................... 14 Planetary Gear Set.................................................................................. 20 Hydraulic Control Components ........................................................ 25 Electrical Components......................................................................... 37 Power Flow........................................................................................................... 51 Complete Hydraulic Circuits...................................................................... 113 Lubrication Points........................................................................................... 142 Bushing, Bearing and Washer Locations ............................................... 143 Seal Locations.................................................................................................. 144 Illustrated Parts List ................................................................................... 147 Basic Specifications........................................................................................ 165 Product Designation System ...................................................................... 166 Glossary.............................................................................................................. 167 Abbreviations.................................................................................................... 169 Index....................................................................................................................... 170