Generator Operation; Deliver Power; Stop Operation Shutdown; Adverse Weather Precautions - Hobart JET-EX 4 Operation And Maintenance Manual

OM-2049
D. Generator Operation
(1) Place speed control switch (13) in RATED RPM (up) position. Engine speed will be 2600 RPM.
(2) Press BUILD UP VOLTAGE pushbutton (10). Generator will produce rated voltage.
(3) Adjust STARTING CURRENT rheostat (4) if necessary.
E. Deliver Power
(1) Connect output cable to AIRCRAFT.
(2) Hold CONTACTOR switch (11) in CLOSE position. Release to ON position as soon as green
CONTACTOR CLOSED light (12) comes on.
F. Stop Operation Shutdown
(1) Place CONTACTOR switch (11) in OFF position. Light (12) should go off to indicate load contactor
has opened and power is no longer available at the aircraft.
(2) Place speed control switch (13) in IDLE (down) position. Allow engine to run for 2 to 3 minutes.
(3) Disconnect output cable from aircraft receptacle and store cable in cable trays or on cable hang-
ers as the case may be.
(4) Place IGNITION switch (19) in STOP/SHUTDOWN position.
G. Adverse Weather Precautions

(1) Cold weather operation

Operation of engine-driven units at sub-zero temperatures requires special precautions and extra
servicing from both operation and maintenance personnel if poor performance or total functional
failure is to be avoided. Consult Maintenance and Operator's Manual and recommendations be-
low.

(2) Fuel system

Keep system clean and free from water which may collect in a low spot in the fuel line and freeze,
plugging the line. Fuel tanks should be kept FULL to prevent water condensation from the air
above the fuel.

(3) Fuel

Keep fuel storage tanks or drums as full as possible to avoid condensation of moisture from the
air above the fuel. After filling or moving fuel containers, allow fuel to settle before using. Never
draw fuel from the extreme bottom of the container. Strain all fuel to remove any foreign matter.
When operating outdoors, take steps to prevent the entry of snow, water and ice into the fuel con-
tainers.

(4) Cooling system

Prior to cold weather, drain and flush the cooling system to remove accumulations of rust and
sediment. Mix and add antifreeze solution, check the cooling system connections for leaks. Add a
can of rust inhibitor to the radiator when system is winterized. This will keep system cleaner and
furnish lubrication for the water pump.
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May 20/89