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 TM 55-1905-219-14-11
5-70.
GOVERNOR - MAINTENANCE INSTRUCTIONS.
a.
Operation
(1)
Two manual controls are provided on the variable speed governor: a stop lever for starting and stopping, and a
speed control lever. For starting, the stop lever is moved to the RUN position, which holds the injector control
racks near the full fuel position. Upon starting, the governor moves the injector racks toward the idle speed
position. The engine speed is then controlled manually by moving the speed control lever.
(2)
The centrifugal force of the revolving governor weights is converted into linear motion, which is transmitted
through the riser and operating shaft to the operating shaft lever. One end of the operating lever bears against
the variable speed spring plunger, while the other end provides a changing fulcrum on which the differential
lever pivots.
(3)
The centrifugal force of the governor weights is opposed by the variable speed spring. Load changes or
movement of the speed control lever momentarily creates an unbalanced force between the revolving governor
weights and tension on the variable speed spring. When the forces reach a balanced condition again, the engine
speed will be stabilized for the new speed setting or new load.
(4)
A fuel rod, connected to the differential lever and injector control tube lever, provides a means for the governor
to change the fuel settings of the injector control racks.
(5)
The engine idle speed is determined by the centrifugal force required to balance out the tension on the variable
speed spring in the low speed range.
(6)
Adjustment of the engine idle speed is accomplished by changing the tension on the variable speed spring by
means of the idle speed adjusting screw.
(7)
Adjustment of the maximum no-load speed is accomplished by varying the tension on the variable speed spring
by the installation or removal of stops and shims as required.
b.
Lubrication
(1)
Surplus oil returning from the cylinder head provides lubrication for the parts in the governor control housing,
the riser thrust bearings, and the weight shaft end bearing. Oil, picked up from a reservoir in the blower front
end plate by a slinger attached to the lower rotor shaft, provides lubrication for the governor weights and weight
carrier.
5-938
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