MIL-S-46777 Semitrailers, Dump, Commercial, General Specification ForThis specification covers various sizes of rear dump semitrailers. The dump semitrailers are operated by the truck-tractors hydraulic system, unless the self-contained engine driven hydraulic option is required.

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MIL-S-46777C

TABLE IV. Examination Schedule (continued).

First

Prod.

Qual.

Conf.

Defect

Requirement

paragraph

x x x

x x

x x x x

x x x

x x

116. Upper fifth wheel and front supports not as

specified.

117. Suspension components not as specified,

incorrect alinement, or inadequate rating.

118. Loading of any tire exceeding highway or

ML rating.

119. Brake system not as specified.

120. Electrical system not as specified.

121. Lubrication system not as specified.

122. Servicing and adjustments incorrect, incomplete, or not as specified.

123. Workmanship not as specified.

124. Leaks in air or hydraulic lines.

125. Seals do not prevent entrance of foreign material or do not prevent leak age of fluid or grease.

126. Assembly incorrect or not complete.

127. Parts or components missing or do not function.

3.9, table III

3.12

3.13

3.15 thru 3.15.9 section 3

section 3

section 3 section 3

4.5.1.1 Stress calculations. Stress calculations (see 3.1.3) for the load-carrying members of the semitrailer shall be made. The theoretical load for the stress calculations shall weight

3,000 pounds per cubic yard for aggregate and 425 pounds per cubic yard for refuse, as

applicable, for a truck. The minimum payload shall be that specified in table I and the applicable specification sheet. Stress in any load-carrying member in excess of 33 percent of the yield point of the material shall constitute failure. Stress calculations for the upper fifth wheel plate

assembly shall be as specified in 3.9, table III.

4.5.2 Tests. Tests shall be in accordance with table V and as specified herein. The contractor may use any truck-tractor for tests in 4.5.2.2 through 4.5.2.4 and 4.5.2.6, with the provision that the contractor's selected truck-tractor model has a published GCWR by its manufacturer equal to or in excess of the actual GCWR of the maximum test weight of the combination and conforms to the safety, performance, and dimensional compatibility requirements specified herein.