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TM 55-2410-237-14
CHAPTER 5
HIGHWAY TRANSPORTABILITY GUIDANCE
Section I. GENERAL
5-1. Scope
This chapter provides highway transportability guid-
movement within CONUS is subject to all safety
ance for moving the D7 crawler tractors. It covers
laws, rules, and regulations that apply to commercial
significant physical characteristics and safety consid-
carriers. In overseas areas, movements
erations. It also prescribes the materials and guid-
by the theater and local regulations.
ance required to prepare, load, and tie down the D7
tractor on the M870 and M172A1 semitrailers.
CAUTION
5-2. Safety
Do not allow the D7 tractor to
miles per hour during loading and
In addition to the safety precautions in chapter 3,
operations.
Section II. SELF-PROPELLED MOVEMENT
5-3. General
are governed
exceed 3
unloading
The D7 tractor is self-deliverable only under appro-
lic highways will not be made without approval from
priate tactical situations. Movement over paved pub-
state highway or local government authorities.
Section III. TRANSPORT BY TRACTOR/SEMITRAILER
5-4. General.
This section covers the D7 tractors transported by
the M916/M870 and M123A1C/M172A1 truck-tractor/
semitrailer combinations. The D7 tractors must be in
the reduced configuration for highway transport on
these combinations. The exhaust stack and pre-
cleaner can be stored and secured on the tractor. The
blade, pusher arms, ROPS, and winch or carrier
beam and ripper must be transported on a separate
truck-tractor semitrailer combination and can be
positioned as shown in figure 5-1 for the D7G. Move-
ment over paved public highways will not be made
without specific approval as outlined in AR 55-162.
5-5. Transport of the D7 Tractors on
the M916/M870 and M123A1C/
M172A1 Truck-Tractor/Semitrailer
Combinations
a. Restrictions. Restrictions for D7 tractor trans-
port on the M916/M870 and M123A1C/M172A1 com-
binations are major. Both legal and permit limits are
exceeded for CONUS transport. Width, single-axle
load, and most combination gross vehicle weights
exceed legal limits, but are within permit limits for
both combinations, Some additional restrictions will
be encountered when transporting the D7 by the
M916/M870 because of the length of this combination.
However, these restrictions are also within permit
limits. Some permit limits, however will be exceeded
for the high tandem-axle loadings and combination
gross vehicle weights. Of the two transporters, the
M123A1C/M172A1 combination will encounter the
most restrictions when hauling the D7. In general,
overseas highway transport is more restrictive than
CONUS highway transport. Legal limits for overseas
are identified in “Limits of Motor Vehicle Sizes and
Weights,” International Road Federation, Geneva,
Switzerland.
b. Materials for Blocking and Tiedown. Adequate
tiedown chains and binders for securing the D7
crawler tractors are basic issue items (BII). Table 5-
1 gives the bill of materials for blocking and tiedown
of the D7 tractor on the M870 semitrailer. Table 5-2
provides data concerning application of materials for
tiedown on the M870. Blocking and tiedown diagrams
compatible with standard loading practices are
provided in figures 5–2 and 5–3. These procedures
will offer adequate restraint against forces encoun-
tered during movement at normal speeds and operat-
ing conditions.
NOTE
The tiedown procedure for the D7E, F, and
G is similar except that the shipper must use
the middle tiedown provision on the D7E
and F, as shown in figure 5–2, as an addi-
tional tiedown point. The center tiedown
provision is not available on the D7G;
however, additional tiedown is not required
on this model. The D7E and F models
require the additional tiedown because they
are heavier than the D7G.
5-1
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