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 over prepared roads with loads to 20 tons at speeds to
50 miles per hour and to be towed over unimproved
roads, trails, and open rolling terrain with loads to
12 tons at speeds to 30 miles per hour.
(2) The air-over-hydraulic operated brake mechanism (fig.
15) is controlled from the towing vehicle.
(3) A stowage box (fig. 4) is provided beneath the body
frame
at
the
right
front
of
the
semitrailer.
c. Semitrailers M270 and M269.
(1) Semitrailers M270 and M269 have been designed to
be
towed
over
prepared
roads
with
loads
to
18
tons
at speeds to 50 miles per hour and to be towed over
unimproved roads, trails, and open rolling terrain with
loads to 12 tons at speeds to 30 miles per hour.
(2) The air operated brake mechanism (par. 10j (2)) is
controlled from the towing vehicle.
(3)
A stowage compartment (figs. 2 and 6) is mounted
on top of the nose or front end of the chassis frame
above and to the rear of the fifth wheel upper plate.
5.
Differences Among Models
a. General. Semitrailers M270A1 (figs. 1, 4, and 7), M270
by differing external and minor internal characteristics. Spe-
cific differences in models are described in b, c, and d below.
Refer to paragraph 10 for detailed description of wheel brakes
and
brake
systems.
b. Chassis Frame and Body Frame. While the construction
of the chassis and body frame of each vehicle is basically the
same, they differ in overall length. The frame of semitrailer
M270A1 is longer than the frames of semitrailers M270 and
M269.
Refer
to
paragraph
18
for
relative
dimensions.
c. Brake Systems.
(1) S e m i t r a i l e r M 2 7 0 A 1 . The semitrailer is equipped with
an air-over-hydraulic brake system (fig. 10). For a
detailed description of the brake system, refer to para-
(1).
(2)
Semitrailers
M270
and
M269.
Each
semitrailer
is
equipped
with
an
air
brake
system
(fig.
11).
For
a
detailed description of the air brake system, refer to
paragraph
10i
(2).
d. Wheel Brakes.
(1)
Semitrailer
M270A1.
The
semitrailer
is
equipped
with
four
hydraulically
operated,
self-centering,
FR2S-type
TAGO 1321B
14
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