TM 55-7440-240-14
Table 7-1. Bill of Materials
for Blocking and Tiedown of
Truck, Cargo,
M813A1, and Power
Unit, PU732/M, on
CON US General-
Purpose Flatcar
Approximate
quantity
Description
Item
Douglas-fir, or comparable, straight-grain, free from material defects; Fed Spec MM-L-
Lumber
751H:
72 linear ft
2 x 4-inch
24 linear ft
2- x 6-inch
30 linear ft
6- x 8-inch
Common, steel, flathead, bright or cement-coated; Fed Spec FF-N-105B:
Nails
40
12d
100
20d
120
40d
120 ft
6 x 19 IWRC, improved plow steel, preformed, regular-lay; Fed Spec RR -W 410C:
5/8-inch
Wire rope
Wire rope, U-bolt clips, saddled, single grip, steel, Crosby heavy-duty or equal; Fed Spec
Clamps
40
FF-C-450D: 5/8-inch
8
Thimbles
Standard, open-type: 5/8-inch
Waterproof paper, burlap, or other suitable material as required.
material
Table 7-2. Application of
Materials for Blocking and Tiedown of Truck,
M813A1, and Power Unit, PU-732/M, on
CONUS
General-Purpose Flatcar
Application
Item
No. required
--
A
Brake-wheel clearance. Minimum clearance required is 6 inches above, in back of, and on both
sides of, and 4 inches underneath wheel, 12 inches minimum clearance from end of car to load,
extending from center of brake wheel to side of car and 6 feet above car floor (figs 7-1 and
7-3).
B
20
and 7-3. Toenail heel of block (33 end, near bottom edge) to car floor with one 20d nail in
each block. Drive two 40d nails into each block, perpendicular to car floor. Toenail each side
of each block to floor with two 40d nails.
Cushioning material (detail 2, fig 7-4). Locate so that material is under item D and extends 2
as required
C
inches above item D between tires and item D.
8
Side blocks (detail 2, fig 7-4). Each to consist of one piece of 2- x 6- x 36-inch lumber and
D
three pieces of 2- x 4- x 36-inch lumber. Nail 2- x 6- x 36-inch piece to edge of lower
2- x 4- x 36-inch piece with five 12d nails. Place 2- x 6- x 36-inch piece against cushioning
material and tire and nail to car floor through 2- x 4- x 36-inch piece with five 20d nails in a
staggered pattern. Nail other 2- x 4- x 36-inch pieces to lower piece with five 20d nails each.
Wire rope (detail 3, fig 7-4). Each to consist of one piece 5/8-inch 6 x 19 IWRC wire rope,
8
E
length as required (approximately 15 feet). Form a complete loop between tiedown provision
and appropriate stake pocket at a maximum angle of 45 degrees. Wire rope ends should
overlap approximately 24 inches.
40
Clamps (detail 3, fig 7-4). Place four on each item E at overlap area. Space clamps 3 inches
F
apart with a minimum of 6 inches from ends of wire rope. Place one clamp on each thimble,
item G, to secure thimble to wire rope at stake pockets.
8
Thimbles (detail 3, fig 7-4). Locate under wire rope at each place where wire rope passes over
G
edge of stake pocket. Secure each thimble to wire rope with one 5/8-inch clamp.
H*
Block. To consist of one piece of 4- x 6- x 18-inch lumber. Locate on flatcar floor under trailer
1
lunette. Toenail to floor with three 30d nails in each side of block. With trailer landing leg
locked in the travel position, lower lunette onto block. Secure trailer as described above.
* To be used only if Power Unit, PU 732/M, is transported separately or not connected to prime mover. Materials for this item