Position carrier with the tracks
the semitrailer wheel wells.
Two chains on each rear tiedown
Figure 2-5. Tiedown of a carrier on the M172A1 semitrailer. (Table 2-3, option 1b)
Table 2-4. Tiedown Procedures for Securing a Typical Carrier on a Semitrailer
Properly rated chains and load binders are preferred for tiedown. Install at indicated locations, as
(4 to 8 required)
shown in figures 21, 23, 2-4, and 2-5.
Use the Following Procedure When Chains Are Not Available
Wire Rope Loops
Each tiedown is made from one piece of l/2-in. wire rope. Cut length as required. (Need a maxi-
(4 or 6 required)
mum of 20 ft per tiedown.) For a complete loop between carrier tiedown provision and appropriate
trailer stake pocket. The angle between the cables and trailer deck (as viewed from the side)
should be as close to 450 as possible. The wire rope ends must overlap at least 24 in. Tension the
wire rope by using two cable grippers and a 3-ton chain hoist or come-along.
Space clamps 3 in. apart. Use 1/2-in. cable clamps, and torque nuts alternately to a minimum of 65
Use thimbles to protect cable at sharp bends. Attach to cable with 5/8-in. cable clamp.
cable loop breaking strength of 36,800
One-half-inch cable clamp nuts must be
pounds. To get the correct torque, apply
torqued to at least 65 ft-lb, to develop full
torque alternately to both nuts.