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Figuer 2-23.
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TM-10-3930-618-20 Truck Lift Fork; Gasoline Engine Driven; Pneumatic Tired Wheels; 6 000 lb. Capacity; 168 Inch Lift Manual
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Section IX. MAINTENANCE OF THE ELECTRICAL SYSTEM
(2) Suspend a reliable thermometer in the water
(1) Drain a sufficient amount of coolant from the
so the sensitive portion does not rest directly on the
radiator to bring the level below that of the thermostat
container bottom or sides.
housing.
(3) Place the container on a stove or other heat
(2) Remove the 2 screws and lockwasher attaching
source. Stir the water occasionally for even heating.
the outlet tube to the thermostat housing and move
(4) In the temperature range of 166F to 165F
the tube from the housing.
the thermostat should start to open and should be
b. Testing.
completely open when the temperature is between
185F and 190F.
(5) Lifting the thermostat into the colder tem-
perature of the surrounding air should cause a pro-
nounced closing action within a short time.
(6) Discard a thermostat that fails to pass the
above test.
c. Installation. Reverse procedure in a above.
Attach the outlet tube securely and check for leaks
with the engine operating.
2-29. Water Temperature Sending Unit
a. Inspect. Check to see if coolant is leaking around
sending unit. Run engine for ten minutes and see if
water temperature dial shows an increase in tem-
perature. If not, sending unit is probably defective.
Replace a defective unit.
b. Removal. Refer to figure 2-23 and remove the
water temperature sending unit as follows :
(1) Drain a sufficient amount of coolant from the
radiator to bring the level below that of the water
temperature sending unit.
ME 3930-618-20/2-24
(2) Disconnect wire going to unit.
Figure 2-24. Testing thermostat (typical).
(34 Remove water temperature sending unit.
c. lnstallation. Reverse procedure in a above.
(1) Fill a container with sufficient water to cover
Inspect for leaks.
the thermostat.
2-30

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