TM 5-2330-325-13&P
FIELD MAINTENANCE
GENERAL INFORMATION
SCOPE
Type of Manual. Operator and Field Maintenance Manual with Repair Parts and Special Tools List.
Equipment Name and Model Number. Semitrailer, Medium Heavy Equipment Transporter (MHET),
40 Ton, M870A3.
Purpose of Equipment. This semitrailer is intended for use in transporting engineer equipment, tracked vehicles,
wheeled vehicles on highways, unimproved roads (graded gravel), and cross country.
MAINTENANCE FORMS, RECORDS, AND REPORTS
Department of the Army forms and procedures used for equipment maintenance will be those prescribed by
DA PAM 750-8 (The Army Maintenance Management System (TAMMS) Users Manual), as contained in the
Maintenance Management Update.
REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)
If your semitrailer 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)
Corrosion Prevention and Control (CPC) 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.
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