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 TM 55-1905-220-14-11
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.
5-940
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