This Technical Manual Change 1 for TM 5-4930-200-20 covers the Gray Model 251-325 and Gray Model 251-315 Lubricating and Servicing Unit, identified under FSN 4930-857-7160 and FSN 4930-064-6887, and is dated May 1969. This change was issued for the original TM 5-4930-200-20 manual dated August 1, 1963, making it an important companion document for collectors, researchers, restorers, and anyone building a serious reference library around U.S. Army maintenance equipment and Cold War technical literature.
Unlike a full base manual, this item is an official Change 1 publication. That means it was issued to revise and update the original manual rather than replace it outright. For collectors, that matters. Army manuals were routinely kept current through numbered changes, and surviving change issues help document how technical guidance, maintenance procedures, and service information evolved while the equipment remained in use. In that sense, this is not just a supplemental insert. It is part of the actual service history of the manual.
The Gray Model 251-325 & 251-315 Lubricating and Servicing Unit
The Gray Model 251-325 and Gray Model 251-315 Lubricating and Servicing Unit belong to the broader family of military maintenance, lubrication, and field-support equipment. As identified by their nomenclature, these were servicing units intended to support lubrication and related maintenance functions, placing them squarely in the support side of Army operations rather than in the category of conventional weapons or combat vehicles.
Equipment in this class was associated with keeping vehicles, machinery, and support equipment properly serviced in field and shop environments. In military use, units like these were relevant to motor pools, maintenance sections, engineer units, and general support operations where dependable lubrication and servicing capability was essential to keeping equipment operational.
For collectors, that makes this manual change especially interesting because it documents the technical side of Cold War military maintenance equipment rather than more commonly seen combat hardware. It also has strong crossover appeal for anyone interested in military shop equipment, lubrication systems, and U.S. Army support infrastructure. The inclusion of FSN 4930-857-7160 and FSN 4930-064-6887 adds cataloging value for collectors who prefer manuals with specific government stock-number references rather than only general nomenclature.
What This Manual Change Covers
Because this publication is a change to TM 5-4930-200-20, it belongs to the organizational maintenance side of Army documentation. In practical terms, a manual change like this is especially relevant for updated service information related to:
Since this is Change 1 for the August 1, 1963 issue, it is especially useful to collectors who want to pair it with the original base manual and preserve the manual as it was actually updated and used in service.
Historical Significance
The date May 1969 places this publication in the Cold War period, when the U.S. military maintained extensive technical literature covering not only weapons and vehicles, but also the maintenance equipment required to keep those systems serviceable. Manuals and change sheets like this reflect a period when Army documentation extended into every part of the logistical chain, including lubrication gear, servicing equipment, maintenance tools, and field-support systems.
For collectors and historians, this manual change is especially relevant to subjects such as:
Because it covers specialized servicing equipment rather than a more common tactical vehicle or weapon system, it also adds variety to collections that already include standard ordnance or maintenance manuals.
About This Item
This listing is for Technical Manual Change 1 for TM 5-4930-200-20 covering the Gray Model 251-325 & Model 251-315 Lubricating and Servicing Unit, identified under FSN 4930-857-7160 and FSN 4930-064-6887 and dated May 1969. It was issued for the August 1, 1963 printing of the original technical manual.
It is especially well suited for:
Because manuals were working documents, surviving examples are valued not only for their content, but also for their connection to real military maintenance and support practice.
Why This Manual Matters
Many military manuals focus only on base editions, but change sheets are a major part of how Army documentation was actually maintained in service. This item adds a layer of authenticity and completeness that a base manual alone does not always provide.
For collectors, it is a useful companion piece to the original TM 5-4930-200-20. For researchers, it helps document the continued maintenance and service history of the Gray Model 251-325 and Gray Model 251-315 Lubricating and Servicing Unit. For museums, it adds context to the administrative and technical side of military maintenance equipment that is often overlooked in favor of more visible hardware.
Ideal For
This manual is a strong fit for:
Approx length 10", Approx width 8", Approx height .1", Approx weight 1lbs.
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