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Page Title: Table 5-4. Application of Materials for Blocking and Tiedown of M973 on the M172A1 Semitrailer
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TM 55-2350-272-14
Table 5-4. Application of Materials for Blocking and Tiedown of M973 on the M172A1 Semitrailer
Item No. Required
Application
A
2
H-frame bracing (figs 5-5 and 5-7). Each layer consists of three pieces of 2- x 6- x 11-inch lumber
and two pieces of 2- x 6- x 96.inch lumber. Place the first piece of 11-inch lumber 20 inches from
the forward end of the trailer with one end 5.5 inches from the centerline of the trailer. Nail to the
trailer with four 12d nails. Place the second piece (centered) 4 feet from the forward side of the
first piece. Place the third piece so that the aft edge is 8 feet from the forward edge of the first
piece. Nail each with four 12d nails. Place one piece of c96inch lumber against the ends of the
11- inch pieces and nail each with sixteen 12d nails. Repeat for the second layer, except nail with
20d nails. Build the second H-frame so that the forward end is 88 inches from the aft end of the
forward H-frame.
Load the M978.
B
4
Forward track chocks (detail 4, fig 5-3). Each consists of five pieces of 2 x 10-inch lumber nailed
together with 12d nails. Place one chock firmly against each track at the forward end of each unit.
Toenail with three 20d nails in each side.
C
4
Rear track chocks (detail 5, fig 8-3). Each consists of five pieces of 2- x 10-inch lumber nailed to-
gether with 12d nails. Place one chock firmly against each track at the rear end of the forward
unit. Toenail with three 12d nails in each side.
D
8
Backup cleats. Use two pieces of 2- x 6- x 12-inch lumber. Place against the heel of each track
chock, items B and C. Nail the lower piece with four 12d nails and the top piece with four 20d
nails.
E*
8
Wire rope (detail 3, fig 5-3). Each consists of -inch wire rope, length as required. Form a com-
plete loop between the tiedown point on the M973 and the tiedown fitting on the trailer.
CAUTION
Tension tiedowns evenly. Do not exceed 400 pounds of tension on any single tiedown.
(Wire rope ends should overlap a minimum of 20 inches.) Secure with four -inch clamps (item
F).
F*
32
Clamps, -inch (detail 3, fig 5-8). Place four clamps on each wire rope loop at the overlap area
and space each clamp 2-1/2 inches apart, with a minimum of 6 inches from the free end of the
wire rope. Tension wire rope and tighten clamps from 20- to 25-foot-pound torque.
*Chains and loadbinders may be substituted.
5-10

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