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TM 55-2410-237-14
Table 7-1. Bill of Materials for Blocking and Tiedown of the D7
Crawler Tractor on a CONUS General-Purpose Flatcar
(Figs 7-1 and 7-2)
Approximate
Item
Description
Quantity
Lumber
Lumber
Nails
Wire rope
Clamps
Thimbles
Oak or comparable hardwood,
straight-grain, free from material
defects; type II, Fed Spec
MM-L-736: 4- by 8-inch
Douglas-fir, or comparable,
straight-grain, free from material
defects; Fed Spec MM–L-
751: 2- by 6-inch
6- by 8-inch
Common, steel, flathead; bright
or cement-coated; Fed Spec
FF-N-105: 30d
6 x 19, IWRC; improved plow
steel; preformed, regular-lay;
Fed Spec RR-W-410:
5/8-inch
Wire rope, U-bolt clips, saddled,
single-grip, steel, Crosby heavy-
duty, or equal;
Fed Spec FF-C-450: 5/8-inch
¾-inch
Standard, open-type: 5/8-inch
H
2
10 linear feet
4
4
C
7 -4
F
20
G
48
12 linear feet
8 linear feet
34
142 feet
48
20
20
Table 7-2. Application of Materials for Blocking and Tiedown of
the D7 Crawler Tractor on a CONUS General-Purpose Flatcar
(Figs 7–1 and 7–2)
Item
No. Required
Application
B
D
12
E
20
A
Brake-wheel clearance. Minimum clear-
ance required is 6 inches above, in back
of, and on both sides of and 4 inches
underneath wheel; 12 inches from end of
railcar to load, which extends from cen-
ter of brake wheel to side of railcar; and
6 feet above railcar floor.
Track chocks. Each consists of 6- by 8-
by 18-inch block cut as shown in detail 1,
figure 7–2. Place one chock firmly
against the center of each track at the
forward and rear ends of the tractor.
Place chock with the 45° cut angle edge
toward the track. Toenail each chock
with four 30d nails.
Backup cleats. Use two pieces of 2- by 6-
by 18-inch lumber for each track chock.
Place against each track chock, item B.
Nail bottom piece with three 30d nails in
staggered pattern and nail top piece with
three 30d nails in like manner.
Wire rope, 5/8-inch, 6 x 19, IWRC. Form
wire rope in a complete loop. Apply from
left and right tiedowns, forward towing
hook, and around the center ripper
shank on top of the tool block on the
track-type tractor to stake pockets. Wire
tie hook and pin to retain wire rope, if
necessary. Overlap wire rope at least 24
inches (details 2 and 3, fig 7–2). See gen-
eral instruction 2.
Thimbles. Place thimbles at the side
tiedowns and the bottom of each stake
pocket.
I
2
Clamps. Fasten thimbles to wire rope
with ¾-inch cable clips to prevent dis-
lodgement.
Clamps. Fasten each wire rope tiedown
with four 5/8-inch wire rope clips spaced
about 3-½ to 4 inches apart. Torque 5/8
-inch clips to 90-foot-pounds.
Lumber, oak, 4- by 8- by 30-inch. Raise
blade and place one piece of lumber
lengthwise, about 36 inches from each
end of blade. Drill and toenail each piece
of lumber to railcar floor with four 30d
nails. Lower blade on top of blocking and
lock hydraulic cylinders into position.
Lumber, oak, 4- by 8- by 30-inch. Raise
rear ripper for placing the two pieces of
lumber stacked one on another in the
center of the ripper. Place a 30-inch
piece lengthwise on railcar. Drill and
toenail first piece of lumber to the railcar
floor with four 30d nails. Then drill and
toenail second piece on top of first with
four 30d nails. Lower ripper on top of
blocking.
GENERAL
1. Brakes must be tightly set and secured.
2. Tractors without ripper must have the rear left and right
tiedowns attached to the rear towing pin. Maintain similar angles
on tiedowns as shown on drawing.
3. General Loading Rules 1, 2, 4, 5, 7, 9, 14, 15, 19, 19A, and 19B
appearing in section 1 of the Rules Governing the Loading of Com-
modities on Open-Top Cars, published by the Association of Amer-
ican Railroads, provide guidelines that are mandatory in
application.
c. Wooden-deck chain-tiedown flatcars, usually are
equipped with four parallel channels that run the full
length of the flatcar deck. Two channels are about 30
inches apart, and two other channels run along the
outer edges of the car, or just inboard of the tread-
way loading area of the car. These channels are
recessed so that the top is flush with the deck
surface. Each channel contains numerous (usually 8
to 12) chain anchors, each with an attached 10- to 12-
foot chain. The chain anchors can be moved along- the
channel and locked in place where needed. At the
free end of the chain, pass a hook through the
tiedown shackle on the vehicle being loaded and pull
the chain hand-tight. Then hook it back onto itself or
directly to the shackle. Apply tension to the chain by
tightening a turnbuckle built into the chain assembly
or by turning a ratchet or screwjack in the anchor
block. Use an open-end wrench to tighten the turn-
buckles. Use a ¾-inch square-drive, heavy-duty
socket wrench to tighten the ratchet at the anchor
blocks. Wire-tie open hooks to prevent them from
becoming disconnected during over-the-road forces
encountered en route. Table 7–3 gives the application
of materials for tiedown of the D7 tractor on wooden-
deck chain-tiedown flatcars.
CAUTION
Vehicles loaded on conventional wooden-
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