Chapter 5. HIGHWAY TRANSPORTABILITY GUIDANCE

TM 55-2320-258-14

CHAPTER 5

H I G H W A Y TRANSPORTABILITY GUIDANCE

Section I. GENERAL

5-1. Scope

der their own power for highway movement. The

systems exceed the CONUS legal dimensional and

This chapter provides transportability guidance for

weight limitations. Special permits are required in

highway movement of the HET and the C-HET

CONUS and special routing is required overseas for

systems. It covers significant technical and physical

outsize shipments. The procedures for obtaining

characteristics and safety considerations and

special permits in CONUS are specified in AR

prescribes the materials and guidance required to

5 5 - 1 6 2 . The systems also exceed the legal

prepare, load, and tie down the system.

limitations in oversea areas that are identified in

5-2. Safety

Limits of Motor Vehicle Sizes and Weights, In-

ternational Road Federation, 1023 Washington

Safety precautions are listed in chapter 3.

Building, Washington, DC 20005.

5-3. General

The HET and C-HET systems are transportable un-

Section Il. TRANSPORT BY SEMITRAILER

5-4 Preparation

9-2320-258-10 provides detailed winch operation

instructions. When the truck-tractor is in the

Secure all basic issue items to preclude damage en

tiedown position, place the transmission in the

route. For detailed instructions refer to TM

neutral position, and apply and lock in the parking

9 - 2 3 2 0 - 2 5 8 - 1 0 , TM 9-2330-294-14, and TM

brake.

9-2320-270-10. When the ether-starting fluid cylin-

d. Tiedown. Figure 5-1 provides a tiedown

der is shipped with the truck-tractor, M746, or

diagram that is compatible with standard loading

truck-tractor, M911, the cylinder must be securely

practices and will adequately restrain the load

mounted and free of leaks. The shipping documents

against forces encountered at normal speeds and un-

must be annotated to describe the cylinder by ship-

der normal operating conditions. Figure 5-2 is a

ping name and classification, that is, "Ether-Flam-

turning diagram for the HET system. Figure 5-3

mable Liquid."

shows axle loads for the HET system.

5-5. Transport on Semitrailer, M747

e. Movement. The truck-tractor, M911, is shown

loaded backwards on the semitrailer, M747 (fig 5-4).

a. General Movement over public highways in

Before moving, the auxiliary transmission must be

CONUS and overseas is normally made when other

put in low range, with pusher axle up and the imer

modes of transport are not available or practical.

axle locked.

Highway shipment may be made using either

f. Material. Adequate blocking and tiedown

military or commercial equipment of adequate

materials are included in the basic issue items for

capacity (23 tons or more). The truck-tractor, M746,

the semitrailer, M747 (table 5-2).

is shown loaded on the semitrailer, M747 (fig 5-1).

g. Loading. The truck-tractor, M911, may be

Procedures for transporting the semitrailer, M747,

backed or winched onto the semitrailer. TM

on a like trailer have not been developed.

9-2320-270-10 provides detailed winch operation

b. Material Adequate blocking and tiedown

instructions. When the truck-tractor is in the

materials are included in the basic issue items for

tiedown position, place the transmission in the

tha semitrailer, M747 (table 5-1).

neutral position and apply and lock-in the parking

c. Loading. The truck-tractor, M746, may be

brake.

driven or winched onto the semitrailer. TM

5-1