Description
TM 9-2300-216-20 Change 3 for the 175mm M107 Self-Propelled Field Artillery Gun and 8-Inch M110 Self-Propelled Howitzer – May 1966
Item Overview
TM 9-2300-216-20 Change 3 is a U.S. Army technical manual update for the 175mm M107 Self-Propelled Field Artillery Gun and 8-Inch M110 Self-Propelled Howitzer. It revises the organizational maintenance publication used by unit mechanics. This change document belongs with the original manual and adds a dated reference to the Army's support of these heavy artillery vehicles during the Vietnam War era.
Publication Details
The change number identifies this publication's place in the manual's revision sequence. Its issue date and equipment stock numbers help collectors match the update to the correct base manual and vehicle models.
- Manual Number: TM 9-2300-216-20, Change 3
- Publication Type: Organizational Maintenance Technical Manual Update
- Change Date: May 1966
- Original Manual Date: June 17, 1962
- Issuing Authority: Department of the Army
- 175mm M107 Self-Propelled Field Artillery Gun: FSN 2350-436-6635
- 8-Inch M110 Self-Propelled Howitzer: FSN 2350-439-6243
Function and Contents
Change 3 amends selected material in the parent maintenance manual and is intended to be read with that publication. The base manual covers service upon receipt, lubrication, preventive maintenance, troubleshooting, and the care of major assemblies. Its subjects include the engine, fuel and cooling systems, electrical equipment, transmission, tracks, suspension, controls, hydraulic systems, armament, and sighting equipment. A maintenance allocation chart assigns work to each maintenance level.
Publication History
The original TM 9-2300-216-20 was issued on June 17, 1962, during the early introduction of this artillery family. Change 3 followed in May 1966, nearly four years later. Numbered changes allowed the Army to revise portions of an existing publication as its technical guidance developed. For collectors, this update records a distinct point in that process. It also helps researchers build a dated set of maintenance references and compare the instructions issued at different stages of the equipment's service life.
Documented Applications
The listed applications are the original M107 175mm gun and M110 8-inch howitzer identified by the Federal Stock Numbers above. Both were tracked artillery vehicles designed to support ground troops and armored formations. The publication concerns maintenance performed at the unit level, making it relevant to the mechanics and support personnel responsible for those vehicles. For historical research, the model and stock-number pairing helps connect the document to the equipment covered at the time of issue.
Equipment History
The M107 and M110 formed part of the Army's move toward more mobile heavy artillery in the early 1960s. The M110 entered U.S. service in 1963. Both vehicles used a common tracked carriage with a diesel engine, torsion bar suspension, and an open rear working platform. A large recoil spade helped stabilize the carriage during firing. Their shared design gave maintenance units closely related automotive systems to support, even though the mounted weapons served different needs. Later improvements extended the M110 family's service with the Army and Marine Corps for more than 30 years.
Weapon-System Background
The M107's long 175mm M113 gun emphasized range, reaching almost 33 kilometers, or about 20 miles. It could provide artillery coverage across a broad area. The original M110's 8-inch howitzer fired a roughly 200-pound projectile to nearly 17 kilometers, or about 10.5 miles, and earned a strong reputation for accuracy. These strengths made the two systems useful partners: the M107 supplied greater reach, while the M110 delivered accurate fire with a heavier projectile. Their common carriage also allowed units to adjust their mix of weapons to suit changing missions.
History of Use
Both systems saw combat service in Vietnam, where heavy artillery batteries operated from fire support bases and other prepared positions. Many division artillery units used the 8-inch howitzer, while field force artillery employed both calibers. The vehicles moved between positions by ground convoy. Their continued usefulness depended on the support work behind the firing line, including engine service, track maintenance, and care of hydraulic equipment. Maintenance manuals and their numbered updates formed part of the reference material that supported this work during training and field service.
Ideal For
This change document suits collections focused on the development and upkeep of U.S. heavy artillery. It is especially useful when assembling the publication history of the M107 and M110.
- Collectors of U.S. Army technical manuals and change documents
- M107 and M110 artillery enthusiasts
- Researchers comparing military maintenance publications
- Museums documenting Cold War and Vietnam-era artillery
- Owners of the June 17, 1962 base manual building a reference set
Approx length 8", Approx width 10", Approx height .1", Approx weight .15lbs.
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