TM 5-4310-276-14
(6) Attach valve assembly and tighten swivel
der, perform the following:
coupling nut on the new cylinder and place fire ex-
(1) Press lever to release pressure from used
tinguisher in mounting bracket.
cylinder.
(7) Adjust instruction band on cylinder to
(2) Loosen swivel valve coupling nut and re-
show maintenance and operating instructions.
move valve assembly from used cylinder.
d. Maintenance. Weigh fire extinguisher every
(3) Remove instruction band from used cylin-
3 months and replace cylinder if gross weight has
der.
decreased 4 ounces (113.4 grams) or more. Lubri-
(4) Place new cylinder through instruction
cats cylinder neck threads with one drop of OE 30
band.
oil before reassembly.
(5) Replace safety pin in valve and seal pin
with sealing wire.
Section III. OPERATION UNDER UNUSUAL CONDITIONS
drops sharply at night. This will prevent condens-
Operation in Extreme Cold
ation from forming in the fuel tank.
(Below 0F (-18C))
e. Keep the engine clean. Service the engine air
a. Locate the air compressor in a shed or build-
cleaner as often as' necessary (figure 3-2).
ing whenever possible. If the unit is operated out-
doors, protect it from prevailing winds and cover it
with a tarpaulin when not in use.
Operation in Dusty or Sandy
b. Lubricate the air compressor in accordance
Areas
with figure 3-1.
a. Lubricate the air compressor in accordance
c. Avoid excessive handling, kinking, and sharp
with figure 3-1, making sure that all lubrication
bending of the air hose, which will become brittle at
points are free from dirt and sand before applying
low temperature.
lubricant. Keep all lubricant containers clean and
d. Keep all fuel tanks and storage containers
tightly closed. Do not lubricate excessively as dirt
filled with fuel to prevent formation of ice crystals
and sand will adhere to excess lubricant and may
from the freezing of condensate. Such crystals will
work into moving parts. Wipe off all lubrication
clog fuel lines and carburetor jets. Use filter paper,
points after lubricating.
chamois, or other type strainer when filling the fuel
b. Protect the air compressor from dust with
tank or transferring fuel from one container to an-
screens, shelters, built from tarpaulin, or other
other.
dustproof material. Keep the unit covered when not
in use.
Always provide a metallic contact be-
than when operating under normal conditions.
tween the fuel container and the fuel
d. Take adequate precautions to prevent sand
tank. This will prevent a spark from
and dirt from entering the fuel tank. Service the
being generated as the gasoline flows
fuel strainer as often as necessary to keep the bowl
over metallic surfaces.
free from dirt or sand. Clean the engine air cleaner
e. Allow engine to reach normal operating tem-
more often than usual.
perature before applying load.
Operation Under Rainy or
O p e r a t i o n in Extreme Heat
Humid Conditions
a. Lubricate the air compressor in accordance
a. Protect the unit with a shelter, keeping the
with figure 3-1.
sides open for ventilation.
b. Check the drive-belt tension frequently. Im-
b. Make sure all surfaces requiring lubrication
proper drive-belt tension often results in over-heat-
are clean and dry before applying lubricant. Lubri-
ing.
cate the unit in accordance with figure 3-1.
c. Coat exposed polished or machined metal sur-
that is well ventilated or provide intake and ex-
faces with a suitable rustproof material after first
haust fans to ventilate in closed areas.
removing any accumulations of rust.
d. Fill the fuel tank at the end of each day's oper-
d. Open the drainclock frequently to blow con-
ation, especially in areas where the temperature
densate from the air receiver tank.
