Description
TM 9-2300-216-34P/3 Technical Manual – 175mm M113/M113A1 Cannons, 8-Inch M2A2 Cannon and M158 Mount – October 1972
Item Overview
TM 9-2300-216-34P/3 is a U.S. Army repair parts and special tools list for the 175mm M113 and M113A1 gun cannons, the 8-inch M2A2 howitzer cannon, and the M158 mount. Dated October 1972, this technical manual covers armament associated with the M107 self-propelled field artillery gun and original M110 self-propelled howitzer. It is a useful period reference for military manual collectors, artillery researchers, and restoration teams studying the parts support behind these heavy weapons.
Publication Details
This volume focuses on cannon and mount parts at the specialist maintenance level. Its identifying details help readers select the correct publication when comparing manuals for different assemblies and service periods.
- Manual Number: TM 9-2300-216-34P/3
- Publication Type: Repair Parts and Special Tools List
- Maintenance Level: Direct Support and General Support
- Publication Date: October 1972
- Issuing Agency: Department of the Army
- 175mm Cannon Coverage: M113 and M113A1 gun cannons
- 8-Inch Cannon Coverage: M2A2 howitzer cannon
- Mount Coverage: M158 mount
By October 1972, the M107 and M110 were well established in service. The Army issued separate books for gun crews, repair units, and parts supply. The 34P number marked a parts list for direct support and general support work. Splitting the information into separate volumes helped each group find the details it needed. This edition records the Army's parts support for cannon and mount assemblies during the later years of the Vietnam War.
Function and Contents
Repair parts lists help users find the parts needed for maintenance. This volume ties cannon and mount parts to the Army's supply records. Parts descriptions and drawings show how smaller items fit into larger assemblies. Special-tool lists cover the tools used by repair units. The catalog works with the matching maintenance manual, so repair and supply staff can use the same part names. For today's reader, it is a guide to the terms and parts records used to support these weapons.
Documented Applications
The 175mm M113 and M113A1 cannons were used on the M107 self-propelled field artillery gun. The M2A2 was the 8-inch howitzer cannon fitted to the original M110. The M158 mount supported the cannon and recoil equipment on this shared artillery platform. These applications make the manual useful for researching the armament carried by preserved vehicles and matching component names to military records. Checking the cannon designation and publication date helps readers place each reference within the correct equipment configuration.
Equipment History
The M107 and M110 entered service in the early 1960s. They shared a tracked carrier design but carried different cannon assemblies. A diesel engine moved the vehicle, and an open rear platform gave crews access to the weapon. A large rear spade braced the vehicle during firing. The M113A1 was an improved version of the 175mm cannon. Over years of use, cannon and mount parts wore or needed repair. Accurate parts records helped support crews find the right items to keep these vehicles in service.
Weapon-System Background
The M107's 175mm gun emphasized long-range fire, reaching nearly 33 kilometers, or about 20 miles. The original M110's 8-inch howitzer delivered a heavier projectile and was known for accurate fire at ranges approaching 17 kilometers, or about 10.5 miles. Their common carriage gave artillery units two heavy fire-support options on a similar vehicle base. The M158 mount held the cannon in alignment and managed recoil through its cradle and recoil system. These assemblies connected the weapon's firing role with the mechanical support needed to keep it serviceable.
History of Use
Both the M107 and original M110 saw combat in Vietnam, providing heavy fire support from artillery positions and firebases. Their continued use depended on repair personnel who serviced cannon assemblies and replaced worn gun tubes. Keeping them in service required replacement components as well as trained gun crews. This manual preserves the technical reference context behind the maintenance aspect of the weapons' service history.
Ideal For
This publication is suited to collections and research projects focused on heavy artillery components and military supply support. Its parts-list format makes it a useful companion to operator and maintenance manuals for the associated vehicles.
- Collectors of U.S. Army technical manuals and Vietnam-era military publications.
- M107 and M110 restoration teams researching cannon and mount components.
- Museums documenting heavy artillery equipment and maintenance support.
- Historians studying military parts supply and artillery service.
- Researchers comparing M113/M113A1 cannon, M2A2 cannon, and M158 mount records.
Approx length 8", Approx width 11", Approx height .35", Approx weight .7lbs.
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