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TM 5-3805-296-23-1
FIELD MAINTENANCE
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GENERAL INFORMATION
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SCOPE
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1. Type of Manual. This manual is for use in field maintenance and troubleshooting on the Military 621G Scraper.
2. Model Numbers and Equipment Names. Military 621G Scraper.
3. Purpose of Equipment. The Military 621G Scraper is an earth-moving machine used to cut, load, transport
and discharge material through forward motion. Mission support role includes construction and maintenance of
roads, airfields, hardstands, drainage, and site preparation for pipeline and river crossing.
MAINTENANCE FORMS, RECORDS, AND REPORTS
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Department of the Army forms and procedures used for equipment maintenance will be those prescribed by (as
applicable) DA PAM 750-8, The Army Maintenance Management System (TAMMS) Users Manual; or AR 700-138,
Army Logistics Readiness and Sustainability.
REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)
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If your Military 621G Scraper needs improvement, let us know. Send us an EIR. You, the user, are the only one
who can tell us what you do not like about your equipment. Let us know why you do not like the design or
performance.
All non-Aviation/Missile EIRs and PQDRs must be submitted through the Product Data Reporting and Evaluation
Program (PDREP) Web site. The PDREP site is: https://www.pdrep.csd.disa.mil/.
If you do not have Internet access, you may submit your information using an SF 368 (Product Quality Deficiency
Report). You can send your SF 368 using email, regular mail, or fax using the addresses/fax numbers specified in
DA PAM 750-8, The Army Maintenance Management System (TAMMS) Users Manual. We will send you a reply.
CORROSION PREVENTION AND CONTROL (CPC)
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Corrosion prevention and control of Army materiel is a continuing concern. It is important that any corrosion
problems with this item be reported so that the problem can be corrected and improvements can be made to
prevent the problem in future items. The term "corrosion" means the deterioration of a material or its properties due
to a reaction of that material with its chemical environment. An example is the rusting of iron. Corrosion damage in
metals can be seen, depending on the metal, as tarnishing, pitting, fogging, surface residue, and/or cracking.
Plastics, composites, and rubbers can also degrade (also considered to be corrosion based on the above definition
of corrosion). Degradation is caused by thermal (heat), oxidation (oxygen), solvation (solvents), or photolytic (light,
typically ultraviolet) processes. The most common exposures are excessive heat or light. Damage from these
processes will appear as cracking, softening, swelling, and/or breaking. The US Army has defined the following
nine (9) forms of corrosion used to evaluate the deterioration of metals. These shall be used when evaluating and
documenting corrosion.
UNIFORM (or general attack): Affects a large area of exposed metal surface, like rust on steel or tarnish on silver.
It gradually reduces the thickness of the metal until it fails.
CREVICE: Occurs in crevices created by rubber seals, gaskets, bolt heads, lap joints, dirt or other surface
deposits. It will develop anywhere moisture or other corrosive agents are trapped and unable to drain or evaporate.
SELECTIVE LEACHING: One element, usually the anodic element of an alloy, corrodes away, leaving the
cathodic element. this can create holes in metal.
INTERGRANULAR: Metal deterioration caused by corrosion on the bonds between or across the grain boundaries
of the metal. The metal will appear to be peeling off in sheets, flaking, or being pushed apart by layers. A particular
type of intergranular corrosion is exfoliation.
PITTING: This can result from conditions similar to those for crevice corrosion. Pits can develop on various
materials due to their composition. Rifle boxes are big victims of pitting.
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