TM 5-6640-212-14
valve in the end cover, and remove the end cover. Pull
3-11. Refrigerator Ice Maker.
the oil pump out of its bearing and release the strainer by
a. Inspection.
removing a snapring. Clean out sediment or sludge if
(1)
Inspect the refrigerator door gasket for
found in the crankcase, as these interfere with oil pump
signs of wear and a tight fit with door closed. (2) Inform
operation. Clean other parts in the crankcase, such as
organizational maintenance of frequent excess of frost.
the relief ball check in the crankshaft counterweight, the
b. Cleaning.
ports in the valve cap and the opening in the
(1)
Exterior. Wipe regularly with a damp,
counterweight. Refer to table 3-1 PMCS chart for detail
lint-free cloth. Occasionally use a quality cleaner to
checks.
restore the original luster of the finish. To eliminate
b. Troubleshooting. The operator should be
fingerprints, apply a commercial glass cleaner or a thin
guided by the following chart (table 3-4) in diagnosing
film of automobile wax wiped on with a soft cloth.
and correcting operating difficulties.
CAUTION
3-7. Water Pump.
Never use an abrasive or an alkaline
a. Lubrication. The water pump requires no
solution.
lubrication. Refer to PMCS chart, table 3-1 for detail
(2)
Interior. It is important that the interior of
checks.
the cabinet be cleaned periodically beginning with the
b. Troubleshooting. The operator should be
initial installation. Spillage and poorly wrapped packages
guided by the following chart (table 3-5) in diagnosing
will tend to cause objectionable odors. When this
and correcting operating difficulties.
condition occurs, clean the entire interior with a solution
3-8. Compressed Gas Cylinders.
of baking soda and warm water. Wipe thoroughly dry
a. Lubrication.
after cleaning.
WARNING
(3)
Condenser. The condenser is located
directly behind the louvered section at the front of the
Do not lubricate the cylinder valve or
cabinet. Use a brush with stiff bristles to remove any
the pressure regulator.
stubborn foreign matter that may cling to the condenser;
then clean thoroughly with a vacuum cleaner.
b. Checks and Services. Refer to PMCS chart,
c. Lubrication. No lubrication is required.
table 3-1 for details.
d. Inspection and Troubleshooting.
c. Troubleshooting. No repairs to a defective
(1)
Electrical trouble check.
cylinder or valve should be attempted by laboratory
(a) When checking for electrical trouble, always be
personnel. In event of leaking or blocked oxygen line,
sure there is a live electrical circuit to the cabinet and
repair or replace the line. Replace entire cylinder if the
that the temperature selector dial is in the OFF position.
cylinder or cylinder valve is defective. Replace the
(b) When the sealed unit will not start and the
pressure regulator if defective.
cabinet temperature is warm, the trouble may be in the
relay, in the thermostat, in the wiring, or in the
Check mounting bolts and duct connections for
compressor motor itself.
tightness.
(c) If the compressor will not run, make a test lamp
3-10. Vaportight Light Fixtures.
check across the relay terminals. The test lamp should
a. Cleaning. Clean the globe and fixture with a
light to show a live circuit if the thermostat is in the
damp, lint-free cloth.
normal operating position and not in the OFF position. If
b. Removal and Replacement of Lamp.
this check does not show a live circuit, the thermostat
(1)
Unscrew and remove the opal globe.
and wiring should be checked for an open circuit. Pay
(2)
Unscrew and remove the heavy duty
particular attention to all terminal connections.
lamp.
(3)
Screw the new ruggedized lamp into
socket.
(4)
Screw
the
globe
in
place.
3-11
