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handling of electrical wiring during extreme cold. Wiring
c. Fuel System. Take care to prevent the entry of
becomes brittle and is easily damaged and cracked.
dust and grit into the fuel system.  Clean the fuel
Maintain the batteries at full charge to increase their
strainer and sediment bowl frequently.  Take special
efficiency and lessen the possibility of damage due to
precautions to keep the air cleaner properly serviced.
extreme cold.
Experience will dictate the servicing interval required.
Caution: Run the engine for at least one hour
2-17. Operation Under Rainy or Humid Conditions
after adding water to battery electrolyte. This will
If the pumping unit is installed outdoors in conditions of
allow water and electrolyte to mix thoroughly and
high humidity, erect a shelter, if possible, to protect the
prevent freezing.
unit. If the erection of a shelter is not possible, cover
2-15. Operation in Extreme Heat
the unit with a tarpaulin or other vapor-barrier material
when the pumping unit is inoperative.  During dry
a.  General.  Provide special servicing and take
periods,  remove  side  panels  to  allow  engine
necessary precautions when operating the pumping unit
components to dry. Maintain a full fuel level in the fuel
in extremely high temperatures.  Provide adequate
tank to prevent the formation of condensation.
ventilation when operating the unit indoors.
2-18. Operation in Salt-Water Areas
b. Fuel System. Do not fill the fuel tank completely to
the top. Allow room for expansion of fuel as it heats to
a. Salt water has a highly corrosive effect on metals.
ambient temperatures.
Prevent contact of salt water with the unit whenever
possible.  If unit is exposed to salt water, wash with
c.  Lubrication.  Lubricate the pumping units as
fresh water after every exposure.
directed in the lubrication order (LO 5-4320-240-12).
Caution:  Never use salt water in the coolant
d. Coolant System. Maintain a sufficient supply of
system of the engine.  This will cause extreme
coolant in the radiator at all times. Keep the cooling
corrosion and will greatly limit life of engine.
system free of rust and scale by using an approved rust
inhibitor.  Make sure that the thermostat is providing
b. Take special precautions to keep the unit painted
proper temperature control of the engine coolant.
properly. Paint all exposed metal surfaces. Coat all
Check the fan belts for proper adjustment. Make sure
exposed polished metal surfaces with standard issue
that the radiator fins are free from dirt, corrosion,
rust proofing materials, if available, or apply a light coat
insects, and other matter that could reduce cooling
of grease.  Refer to TM 9-213 for preservation and
efficiency. Adjust the fan belts (para 3-11).
painting instructions.
2-16. Operation in Dusty or Sandy Areas
2-19. Operation at High Altitudes
a.  General.  If the pumping unit is permanently
a. General. As altitudes increase, the thinning of the
installed, provide a protective shelter if possible. For
air decreases engine efficiency so that power output
temporary  installation,  take  advantage  of  natural
drops approximately 31/2 percent for each 1,000 feet of
barriers to protect the unit as much as possible. Keep
elevation. Because of the reduced external pressures,
side panels and the instrument panel cover closed.
suction lifts decrease and pumping efficiency is also
Keep the unit free of sand and dirt,' taking special care
greatly reduced. Refer to table 2-2. For these reasons,
to keep radiator cores clean.
it is highly important to maintain all other systems at the
peak of efficiency to assure that all available power is
b. Lubrication. In sandy and dusty areas, service the
applied to the pump.
oil filter more frequently than directed in the lubrication
order.  Clean all lubrication points before and after
b.  Carburetor.  Decreased air pressure at high
lubrication.  Keep lubrication containers tightly sealed
altitudes upsets the calibration of the carburetor, causing
and stored in a dust-free area.
an excessively rich fuel-air mixture.
Adjust the
carburetor as directed in paragraph 3-32.
2-11

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