Table 7-1. Bill of Materials for Blocking and Tiedo wn of Truck Tractor, M746 and M911, on CONUS General-Purpose Flatcar (Figs- 7-1, 7-3, and 7-4).

TM 55-2320-258-14

Table 7-1. Bill of Materials for Blocking and Tiedo wn of Truck Tractor, M746 and M911,

on CONUS General-Purpose Flatcar (Figs- 7-1, 7-3, and 7-4).

Approximate

Item

Description

quantity

Lumber . . . . . . . . . . . . . . . . . . . . . . .

Douglas-fir or comparable, straight-grain, free from material de-

fects; Fed Spec MM-L-751H: 2- x 4-in. . . . . . . . . . . . . . . . . . . . .

108 linear ft

2- x 6-in. . . . . . . . . . . . . . . . . . . . .

77 linear ft

12 linear ft

6- x 8-in. . . . . . . . . . . . . . . . . . . . .

Nails . . . . . . . . . . . . . . . . . . . . . . . . .

Common, steel; flathead, bright or cement-coated; Fed Spec

FF-N-105B:

12d . . . . . . . . . . . . . . . . . . . . . . . . . . .

AM.. . . . . . . . . . . . . . . . . . . . . . . . . .

224

God . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard, open-type 5/8-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wire rope, U-bolt clips, saddled, single-grip, steel, Crosby heavy-

duty, or equal; Fed Spec FF-C-450D: 5/8-in . . . . . . . . . . . . . . . . . . .

6 x 19, IWRC; improved plow steel; preformed, regular-lay; table

X, Fed Spec RR-W-410C:5/8-in. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

120 ft

Waterproof paper, burlap, or other suitable material . . . . . . . . . . . .

as required

Table 7-2. Application of Materials for Blocking and Tiedownof Truck-

Tractor, M746, on CONUS General-Purpose Flatcar (Figs 7-1 and 7-3)

Item

No. required

Application

Brake wheel clearance. Minimum clearance required in 6 in. above, in back of, and on both sides of,

and 4 in. underneath wheel, 12-inch minimum clearance from end of car to load, extending from

center of brake wheel to side of car and 6 ft above car floor (fig 7-l).

Blocks. Each to consist of one piece of 2- x 6- x 25-in. lumber. Locate one block against wheels as

shown in figure 7-1, and nail to car floor with five 20d nails.

Blocks (detail 1, fig 7-3). Each to consist of one pieceof 6- x 8- x 24-in. lumber cut as shown in

detail 1. Locate one block on top of each item B with 45-degree side against tire. Nail heel of block

to item B with three 40d nails. Toenail sides of block to car floor through item B with two 40d nails

on each side. (Pattern 16)

1 ea item E

Cushioning material. Locate bottom portion under item E, and between tire anditem E seas to extend

2in. above item E (detai12, fig 7-3).

Side block. Each to consist of one piece of 2- x 6- x 108-in. lumber and three pieces of 2- x 4- x

108-in. lumber (detai12, fig. 7-3). Nai12- x 6- x 108-in. piece to edge ofbottom2- x 4- x 108-in.

piece with fifteen 12d nails. Place against inside of tires and cushioning material and nail to car floor

through 2- x 4- x 108-in. piece with twelve 20d nails. Nail other two 2- x 4- x 108-in. pieces to

one below in the same manner. (Pattern 89)

Brace. Each to consist of one piece of 2- x 6- x length to-suit (approximately 72 in.) lumber. Locate

one under each axle between items E Nail to car floor with ten 20d nails.

Wire rope. Each to consist of one piece 5/8-in. 6x19, IWRC wire rope, length as required

(approximately 20 ft). Form a complete loop between tiedown shackle and appropriate stake pocket

at a maximum angle of 45 degrees (detail 3. fig. 7-3). Wire rope ends should overlay approximately

24 in.

Thimbles. Place one under wire rope at each place where rope passes over bottom edge of stake pocket

and tie down shackle. Secure each thimble to wire rope with one 5/8 clamp (detail 3, fig 7-3).

Clamps. Place four on each item H at overlap area. Space clamps 31/2 in. apart with a minimum of 6

in. from endsof wire rope (detail 3, fig 7-3). Place one on each item J as indicated above.

GENERAL INSTRUCTIONS

1. Set handbrakes, and block and wire levers in place.

2. Place and wire-tie gearshift levers in the neutral position.

3. See General Rules 1, 2, 3, 4, 5, 14, 15, 19A, and 19B, Section I of the Rules Governing the Loading of Commodities on Open-Top Cars

and Trailers published by the Association of American Railroads for further details.

4. Tension wire rope with inapplicable sized come-along mechanical hoist or equal tensioning device.

Change 1

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