T M 5 5 - 2 3 5 0 - 2 6 2 - 1 4
(2) The H-frame shoring should be installed
raised to the travel position by using the truck-
between the tracks, as shown in figure 51.
tractor winch cable, and the semitrailer must be
(3) The vehicle should be parked, with the
connected to the M920 truck tractor.
brake set, as shown in figure 5-2. The dozer blade
(5) Data for the application of material re-
should be lowered to the floor of the trailer.
quired to restrain the vehicle are provided in table
(4) The M870 semitrailer gooseneck must be
Table 5-1. Bill of Materials for Blocking and Tiedown of the M9 ACE on the M870 Semitrailer
Douglas-fir, or comparable, straight grain, free from material defects; Fed
65 linear feet
Spec MM-L-751H: 2- x 4-inch
6 x 19, IWRC: improved plow steel; preformed regular-lay; table X, Fed Spec
Wire rope, U-bolt clips, saddled, single-grip, steel, Crosby heavy-duty, or
equal; MIL-STD 16842 5/8-inch
Standard, open-type: 5/8-inch
Common, steel; flathead, bright or cement-coated; para 188.8.131.52 Fed Spec
FF-N-105B: 12D (3-1/4-inch)
*Suitable capacity chains and load binders may be substituted for 5/8-inch wire rope and clamps.
Table 5-2. Application of Material for Tiedown of the M9 ACE on the M870 Semitrailer (Fig 5-2)
Side blocking, 2- x 4- x 120-inch lumber (doubled). Pre-position. Nail first piece
to trailer floor with one 12d nail every 8 inches. Nail second piece to first in a
Lateral bracing, 2- x 4-inch x length-cut-to-fit lumber (doubled). Pre-position.
Nail first piece to trailer floor with one 12d nail every 8 inches. Nail second
piece to first in a like manner.
Thimble, open-type, 5/8-inch. Place one on each M9 ACE tiedown (front and
back) and on each semitrailer outside tiedown ring to be used.
Wire rope, 5/8-inch. Attach, in a complete loop, through thimbles on the vehi-
cle tiedown and through the thimbles on the semitrailer outside tiedown rings
on the same side.
Clamp, 5/8-inch. secure the ends of the wire rope with four clamps each. Se-
cure the thimbles with one clamp each.