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|  MIL-T-62735
TABLE XV. Fifth wheel heights.
Class
Model
Fore and aft rocking
Full oscillating
millimeters (inches)
millimeters (inches)
1345 25 (53 1)
25 (48 1)
4x2
Up to 32
1220
1370 25 (54 1)
25 (49 1)
4x2
23 to 32
1245
1370 38, -25 (54 +1.5, -1)
38, -25 (49.5 +1.5,-1)
6x4
33 to 53
1255
1475 38, -25 (58 +1.5, -1)
38, -25 (49.5 +1.5,-1)
6x4
54 and up
1255
4x4
All
1525 25 (60 1)
25 (55 1)
1400
6x6
Up to 65
1525 25 (63 1)
25 (55 1)
1400
6x6
66 and up
1625 25 (64 1)
25 (56 1)
1420
8x4
All
1625 25 (64 1)
25 (54 1)
1370
8x6
All
25 (54 1)
1370
For sliding fifth wheel base,
All
All
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 J1067. The cable shall incorporate a connector
conforming to SAE J560 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).
33
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