TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 12 of 1275
TM 9-2350-311 -20-1
HOW TO USE THIS MANUAL
GENERAL
This manual contains unit maintenance instructions for the M109A2/M109A3/M109A4/Ml109A5
Howitzers’ hull and hull-
related components.
The front matter in this manual consists of a cover index, general warnings, and a table of contents.
This manual is divided into 14 chapters and 9 appendixes. Each chapter and appendix starts on a right-hand page with
the page number of 1. Pages are numbered after the chapter number or appendix letter. For example, 1-14 means
Chapter 1, page 14, and A-2 means Appendix A, page 2.
At the end of this manual are an alphabetical index, eight schematics, DA Form 2028-2, and a metric conversion chart.
a. Front Matter
The front cover has an index for the major divisions in this manual. The first page of the associated major division has
a black edge that lines up with the applicable cover boxed-in area.
There are general warnings that start on the first right-hand page immediately after the cover that should be read before
performing any maintenance on the howitzer.
The table of contents has the page where each chapter, section, appendix, and paragraph starts.
b. Chapters
Chapter 1 provides general information, equipment description, and principles of operation of the howitzer.
Chapter 2 provides general unit maintenance instructions for the hull including Preventive Maintenance Checks and
Services (PMCS).
Chapter 3 covers troubleshooting the howitzer.
Chapter 4 provides unit maintenance instructions for removing the powerplant.
Chapter 5 provides unit maintenance instructions for the engine.
Chapter 6 provides unit maintenance instructions for the fuel, air intake, and exhaust systems.
Chapter 7 provides unit maintenance instructions for the engine cooling system.
Chapter 8 provides unit maintenance instructions for the hull electrical systems.
Chapter 9 provides unit maintenance instructions for the transmission, transfer, and drive control assemblies.
Chapter 10 provides unit maintenance instructions for the tracks, suspension system, final drives, and universal joints.
Chapter 11 provides unit maintenance instructions for hull-related components.
Chapter 12 provides unit maintenance instructions for the Nuclear, Biological, and Chemical (NBC) protection
equipment.
iv
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