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are
not
always
apparent,
but
any
deviation
from
proper procedures may cause trouble at the least ex-
pected time.
(b) In
arctic
operations,
with
moisture
is
a source of many difficulties. Moisture can be the
result of snow getting into the product, condensa-
tion
due
to
"breathing"
of
a
partially
filled
con-
tainer,
or
moisture
condensed
from
warm
air
in
a
partially
filled
container
when
a
product
is
brought
outdoors
from
room
temperature.
Other
will
also
contaminate
so
their
usefulness
is
impaired.
(c)
Refer
to
TM
9-2855
for
detailed
instructions
on
storage, handling, and use.
c. E x t r e m e - c o l d Weather Operation.
(1) The driver of the towing vehicle must always be on
the alert for indications of the effect of cold weather
on the semitrailer.
(2)
The
driver
must
be
very
careful
when
placing
the
semitrailer in motion after a standstill.
Congealed
may
cause
failure
of
parts.
Tires
frozen
to the ground or frozen to the shape of a flat spot
while underinflated must be considered. Brake shoes
may
be
frozen
fast
and
require
preheating
to
avoid
damage to the mating surfaces.
(3) Wheel bearings should be thoroughly cleaned and hand-
picked with the lubricant specified in the lubrication
order (par. 38), as soon as the tactical situation per-
mits.
(4) When semitrailers are not in use, they should be placed
in  a  sheltered  spot  out  of  the  wind.  If  no  shelter  is
available, place semitrailer so that its least vulnerable
parts  face  into  the  wind.  When semitrailers are not
in use for long periods of time, if high ground is not
available, prepare a footing of planks or brush. Chock
in place if necessary.
(5) After operation, clean snow, ice, and mud from semi-
trailers as soon as possible. Refer to table II (par.
43) for detailed after-operation procedures. Cover and
shield the vehicle but keep ends of the canvas paulins
off the ground to prevent them from freezing to the
ground.
(6) Check air pressure of tires (par. 52) with tire pres-
TAGO 1321B
53



 


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