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 In
addition
to
the
normal
preventive
maintenance
serv-
ice, special care in cleaning and lubrication must be
observed
where
extremes
of
temperature,
humidity,
and
terrain conditions are present or anticipated. Proper
cleaning, lubrication, and storage and handling of
lubricants
not
only
insure
proper
operation
and
func-
tioning, but also guard against wear of the working
parts and deterioration of the materials.
(2) TM 21-300 contains very important instructions
on
driver
selection,
training,
and
supervision;
and
TM
21-305
prescribes
special
driving
instructions
for
op-
erating wheeled vehicles under unusual conditions.
C a u t i o n : It is imperative that the approved prac-
tices
and
precautions
be
followed.
A
detailed
study
of these technical manuals is essential for use of this
materiel under unusual conditions.
(3)
Refer
to
for
lubrication
under
unusual
conditions and to table II, for preventive maintenance
checks.
(4)
When
chronic
failure
of
materiel
results
from
sub-
jection to extreme conditions, report of the conditions
should be made on DA Form 468 (par. 3).
b.
Extreme-Cold Weather Conditions.
(1) G e n e r a l
problems.
(a) Extensive
preparation
of
materiel
for
scheduled
op-
eration
in
extreme
cold
weather
is
necessary.
Gen-
erally, extreme cold will cause lubricants to thicken
or congeal, crack insulation and cause electrical short
circuits,
and
will
cause
the
various
construction
ma-
terials to become hard, brittle, and easily damaged
or broken.
(b) For description of operations in extreme cold, refer
to FM 31-70 and FM 31-71, as well as to TM 9-2855.
C a u t i o n : It is imperative that the approved prac-
tices
and
precautions
be
followed.
TM
9-2855
con-
tains
information
which
is
specifically
applicable
to
these semitrailers as well as to other vehicles. It
must be considered an essential part of this manual,
not merely an explanatory supplement to it.
(2) Lubricants
(storage,
handling,
and
use).
(a) The
operation
of
equipment
at
arctic
temperaturers
will
depend
to
a
great
extent
upon
the
condition
Immediate effects of careless stor-
of lubricants.
age and handling or improper use of these materials
TAGO 1321B
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