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 TM 55-1905-219-14-4
3-10. VARIABLE SPEED MECHANICAL GOVERNOR - MAINTENANCE INSTRUCTIONS
(Cont).
(3) The centrifugal force of the governor weights is opposed by the variable speed spring. Load changes
or movement of the speed control lever create an unbalanced force between the revolving governor weights
and tension on the variable speed spring. When the two forces are equal, the engine speed stabilizes for a
setting of the speed control lever.
(4) Fuel rods connected to the injector control tube levers and the control link operating lever assembly
are operated by the differential lever, through the operating lever connecting link. This allows the governor to
change the fuel settings of the injector rack control levers.
(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) To adjust the engine idle speed, change the tension on the variable speed spring by adjusting the idle
speed screws. Adjustment of the maximum no-load speed is done by varying the tension on the variable speed
spring by installing or removing stops and shims.
c. Lubrication.
The governor is lubricated by a spray of lubricating oil from the blower end plate. The governor weights
distribute this oil to all parts of the governor assembly requiring lubrication. Oil returning from the governor
goes through passages in the blower end plate and cylinder block to the engine oil pan.
3-417
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