TM-9-2520-272-40 Direct Support for M113A3 X200-4A Transmission 2520-01-397-1074 Download
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TM 9-2520-272-40 HOW TO USE THIS MANUAL SCOPE This manual has been prepared to tell you how to perform Sustainment Maintenance on the Allison Transmission Cross-Drive Transmission, Model X200-4A. Your success in accomplishing your assigned tasks depends very much upon how well you learn to use this manual. You must make yourself familiar with every part of the manual before beginning any troubleshooting or maintenance assignments. It is particularly important for you to understand and remember the contents of Chapter 3, WP 0067, General Maintenance Information, before doing any work on the transmission. You must familiarize yourself with all steps in a maintenance procedure be- fore beginning the maintenance task. FOLLOWING THE FRONT COVER Warnings are placed in the manual when you are about to do something that could injure or kill you or someone else. Always take the precautions described in the warnings. A summary of warnings used throughout the manual begins following the front cover of the manual. For your safety and the safety of others around you, be sure you understand all of these warnings. TABLE OF CONTENTS The Table of Contents lists the main subjects of the manual and shows the Work Package number where each begins. These main subjects are made up of Chapters and the Glossary. INTRODUCTION The General Information work package (WP 0001) to the manual provides you with an introduction to the transmission. WP 0002, Equipment Description and Data, pictorially identif es the major assemblies and subassemblies of the transmission. WP 0003 provides the theory of operation. In WP 0001, you will f nd the Nomenclature Cross-Reference List. Sometimes a part is generally known by a common name which is not the same as the formal name used in the associated Repair Parts and Special Tools List (RPSTL), which is TM 9-2520-272-40P for this transmission. When maintenance procedures use the common name for a part, the Nomenclature Cross-Reference List will usually provide the formal name for the part as shown in the RPSTL. For example, the name used by maintenance personnel for the hydrostatic pump and motor assembly is “hydrostat.” The RPSTL calls this unit “hydrostatic pump and motor assembly.” If you were to look in the RPSTL for “hydrostat” and did not f nd it, then you would go to the Nomenclature Cross-Reference List (WP 0001) to determine what the part is called in the RPSTL. There are a few common terms which will not appear in the Nomenclature Cross-Reference List and they will not appear in the RPSTL. One of these terms is “range pack,” meaning all of the parts in one area of the transmission (mostly clutch assemblies) that function individually or collectively to vary the speed and power output or to change forward-reverse direction. Since the term “range pack” is a collective term applying to several parts and assemblies in the RPSTL, it has no specif c RPSTL equivalent. Therefore, the term “range pack” will appear in the Glossary only. If you encounter a term which is not shown in the Nomenclature Cross-Reference List or the RPSTL, check the Glossary. EQUIPMENT DATA The Equipment Data section (WP 0002) provides particulars about the transmission such as input horsepower, ratios of forward and reverse ranges, oil capacity, transmission weight, and Usable on Codes (UOCs). xvii