MIL-T-62735 Trucks And Truck Tractors: Modified Commercial, General Specification ForThis specification covers general requirements for the classes, models and types of modified commercial trucks indicated in the specification title above and in 1.2 below. This specification is intended only as a document to be referenced in detail specification sheets that must, as a minimum, cover detailed truck body requirements and specify the model and class required from table I.

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MIL-T-62735

TABLE XV. Fifth wheel heights.

Class

Model

Fore and aft rocking

millimeters (inches)

Full oscillating

millimeters (inches)

Up to 32

23 to 32

33 to 53

54 and up

All

Up to 65

66 and up

All

4x2

6x4

4x4

6x6

8x4

8x6

All

1220 25 (48 1)

1245 25 (49 1)

1255 38, -25 (49.5 +1.5,-1)

1400 25 (55 1)

1420 25 (56 1)

1370 25 (54 1)

1345 25 (53 1)

1370 25 (54 1)

1370 38, -25 (54 +1.5, -1)

1475 38, -25 (58 +1.5, -1)

1525 25 (60 1)

1525 25 (63 1)

1625 25 (64 1)

For sliding fifth wheel base, add 3 inches

3.4.2.7 Approach ramps. Truck tractors with full oscillating fifth wheels shall have approach ramps. Approach ramps shall give support for the fifth wheel forks and a continuous incline for semitrailer approach. The ramps shall taper from the rear of the chassis frame to the fifth wheel forks. The forward (highest) edges of the approach ramps shall be rounded and smooth. Additional approach ramp details are specified in 3.4.2.16.4(c) and 3.4.2.21 for specialized truck tractors.

3.4.2.8 Deck plate. The tractor shall have a deck plate of self-cleaning grating. The

deck plate shall be suitable for use by an operator in connecting air and electric lines between the

truck tractor and a semitrailer. The deck plate shall extend across and shall be bolted to the frame rails. There shall be provisions to enable the operator to climb onto the deck plate. The grating shall have access openings for vehicle maintenance. The deck plate shall have no ragged or sharp exposed edges.

3.4.2.8.1 Deck plate location. The deck plate shall start from as close to the cab as possible and shall extend not less than 460 mm (18 inches) toward the rear of the vehicle. When a hydraulic or pneumatic fifth wheel is furnished or when a back-of-cab mounted winch or other rear mounted equipment is furnished, the deck plate shall extend further rearward, sufficient to provide a platform for access to such equipment.

3.4.2.9 Semitrailer lighting cable. The truck tractor shall have a semitrailer lighting cable installed. The cable shall conform to SAE 11067. The cable shall incorporate a connector conforming to SAE 1560 on the semitrailer end. The cable shall be pre-coiled and shall have an extended length of not less than 2800 mm (110 inches) (but see 3.4.2.16 and 3.4.2.18).