TM 9-2520-246-34 CHAPTER 1 INTRODUCTION Section I. GENERAL 1-1. Scope. a. This manual contains the direct support and general support maintenance instructions for transmission models 3052 and 3053A; transfer models T-136-21 and T-136-27; power takeoff models WN-7- 28, WND-7-28, and P-136-C. This manual also provides descriptions of these items and procedures for troubleshooting, removal, disassembly, assembly, cleaning, inspection, test, adjustment, installation, repair, and rebuild, as directed by the maintenance allocation chart. b. Chapter 2 contains information on repair parts, tools, troubleshooting. general maintenance instructions, and removal and installation of major components. c. Chapter 3 contains all repair and overhaul procedures pertinent to transmission models 3052 and 3053A. d. Chapter 4 provides all the repair and overhaul procedures pertinent to transfer models T-136-21 and T-136-27. e. Chapter 5 contains all the repair and overhaul procedures for power takeoff models WN-7-28, WND- 7-28, and P-136-C. f. Appendix A provides a list of current and applicable references to the transmissions, transfers, and power takeoffs used on the 2½-ton, 6x6 series trucks. g. Refer to TM 9-2520-246-34P for a listing of parts and special tools for the maintenance of the transmissions, transfers, and power takeoffs for the 2½-ton, 6x6 series trucks. 1-2. Maintenance Forms and Records. Equipment maintenance forms and procedures for their use are contained in TM 38-750, The Army Maintenance Management System (TAMMS). 1-3. Quality Assurance/Quality Control. Repair and replacement standards for transmissions, transfers, and power takeoffs are supplied in each chapter. Through compliance with the engineering tolerances specified in this manual for repairs and adjustments, maintenance of quality control is assured. 1-4. Equipment Improvement Recommenda- tions. EIR’s will be prepared on DA Form 2407, Maintenance Request. Instructions for preparing EIR’s are provided in TM 38-750, The Army Maintenance Management System. EIR’s should be mailed directly to: Commander, U.S. Army Tank- Automotive Materiel Readiness Command, ATTN: DRSTA-MP, Warren, Michigan 48090. A reply will be furnished directly to you. 1-5. Use of Metric Measurement Units. The equipment described herein is nonmetric and does not require metric common or special tools; therefore, metric units are not supplied. Section II. DESCRIPTION AND DATA 1-6. Description. b. Transmissions. a. General. A short description covering each transmission, transfer, and power takeoff is provided. The descriptions are used to familiarize direct support, general support, and depot maintenance personnel with the different types and models of each unit. For a more detailed description and operation of each assembly, refer to Chapters 3, 4, and 5. Differences between models, if pertinent, are included. (1) Transmission models 3051 and 3053A (fig. 1-1 and 1-2) are manual shift, synchromesh, selective gear types with five speeds forward and one reverse. The outer cases are made of cast iron and serve as a support for the various bearing shafts and other parts of the transmission gear train. For a more detailed description and operation refer to Chapter 3. 1-1