MIL-T-62735
3.4.2.20 Approach ramps for M747 semitrailer compatibility. When specified (see 6.2), in addition to all other requirements herein, the approach ramps, SR, LWC, and other features of the truck tractor shall be suitable for use with the tactical M747 semitrailer. The approach ramps shall be in a V shape to guide a semitrailer kingpin to the fifth wheel forks. The rear opening of the V shall not exceed 460 mm (18 inches). The SR and LWC shall conform to the TVES,
class 76 and up requirements of table XVI in lieu of 3.4.2.4. In addition, there shall be no potential obstruction to a coupled semitrailer to the rear of a transverse line 940 mm (37 inches) forward of the centerline of the fifth wheel.
3.5 Body mounting, chassis and body accessories and permissible modifications.
3.5.1 Chassis frame alterations. The chassis frame rails shall not project beyond the rear end of the body. The end of the frame rails shall be properly cut off as necessary. On truck tractors, the chassis frame rails shall be cut off immediately to the rear of the rear spring rear hanger brackets or the frame crossmember closest to the rear of these brackets. These and all other chassis frame alterations whatsoever shall be made only in strict accordance with written guidance from and approval of the chassis manufacturer's engineering department. Chassis manufacturer's body builders guidance publications are an acceptable proof of such approval.
3.5.2 Accessibility. The design of the vehicle and optional and mounted equipment shall permit access for routine servicing and shall permit access for replacement and adjustment of component parts and accessories with minimal disturbance of other components and systems.
3.5.3 Body mounting. Unless otherwise specified in the detail body specification sheet referencing this general specification, bodies shall be secured with U-bolts, twin studs or brackets and shall include a wood breaker strip, except dump trucks shall have full length rivet pads or a full length subframe, tapered up at the front on the top of the chassis frame rails. The
dump body pads or subframe rails shall prevent the dump body longitudinal sills from contacting and chafing against the chassis frame rails. Shifting of any body on the chassis shall not be acceptable under any conditions.
3.5.3.1 U-bolts or twin studs. When U-bolts or twin studs are used, there shall be not less than three U-bolts or twin studs per side on model 4x2 and 4x4 and four per side on model
6x4 and 6x6. Each shall have a 14.3 mm (0.563 inch) minimum diameter with 16 mm
(0.625 inch) minimum thread diameter. Tie-plates shall be at least 13 mm (0.500 inch) thick. A
slight deformation of tie-plates upon assembly is permissible. The vehicle chassis frame shall have braces, using wood blocks at each mounting point unless the mounting point is located at a full depth chassis frame crossmember. Blocks shall incorporate a keeper strap or groove for the mounting bolt. Blocks shall be of a width and thickness to assure retention. There shall be two
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