TM 55-4920-215-15
20. Extreme Cold Weather Operation
(7) Open drain cocks to remove liquid from
a. General.
water separators and cooling systems and
inspect drain cock for obstructions.
(1) The operator must always be on the alert
Remove any foreign material or
for indications of the effect of cold
obstructions from drain cocks. Leave
weather on the equipment.
drain cocks in full open position while
(2) The operator must exercise caution when
equipment is inoperative.
placing the equipment in operation after a
21. Operation in Extreme Hot Weather Conditions
shutdown.
Thickened lubricants may
cause failure of parts.
a. General.
Operation of the equipment in
extreme hot weather conditions requires efficient cooling
Warm up motorized equipment thoroughly
and proper lubrication. Halt the equipment for a cooling
before operating, check source voltage of
off period whenever necessary and conditions permit.
electrical equipment to ascertain that
Frequently inspect and service cooling units, oil filters,
sufficient power is available to prevent
and air cleaners. Check ventilators periodically for
motor burnout.
cracks and obstructions. Check lubricants for viscosity
(3) Constantly note instrument readings. If
and lubricating ability.
instrument readings consistently deviate
b. At Stop.
from normal, stop the equipment and
investigate cause.
(1) Do not leave equipment in the sun for
b. At Stop.
long periods, place equipment under
cover to protect it from the sun, sand, and
(1) When halted for short shutdown period,
dust when possible.
the equipment should be sheltered from
(2) Cover inactive equipment with tarpaulins
the wind.
if no other suitable shelter is available.
(2) When preparing equipment for shutdown
(3) Equipment inactive for long periods in hot
periods, place control levers in the neutral
humid weather is subject to rapid rusting i
position to prevent them from freezing in
accumulation of fungi growth.
Make
an engaged position. Freezing may occur
frequent inspections and clean and
when
water
is
present
due
to
lubricate
to
prevent
excessive
condensation.
deterioration. Protect cooling systems
(3) Clean all equipment of ice and
with rust inhibitor compound. Remove the
condensation as soon as possible after
batteries and store in a cool place.
operation. If the canvas covers are not
installed, be sure to protect all equipment
22. Operation in Extreme Wet Climate
against entrance of loose, drifting snow
Mud, water, and high humidity are enemies of
during the halt.
the equipment in this shop set. Particular attention
(4) If heater is not in operation the storage
should be paid to formation of rust, mud scale, dirt
batteries should be removed and stored in
buildup, and mildew. All equipment exposed to these
a warm place.
conditions should be cleaned and oiled frequently in
(5) Refuel equipment immediately in order to
order to preserve the operating efficiency.
reduce condensation in the fuel tanks.
Prior to refueling, open fuel tank drain
23. Operation In Snow and Ice
cock and drain off any accumulated
The precautions listed in paragraphs 20 and 21,
water.
apply to operating the equipment in snow and ice.
(6) Immediately after shutdown, start the
heater and check to be sure it operates
effectively. The heater should eliminate
the necessity of removing the signed to
operate unattended overnight.
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