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 TM 55-1905-219-14-6
3-142. GOVERNOR AND BREATHER TUBE-- MAINTENANCE INSTRUCTIONS.
a. General
(1) The variable speed mechanical governor performs three functions:
(a) Controls the engine idle speed.
(b) Limits the maximum no-load speed.
(c) Holds the engine at any constant speed, between idle and maximum, as desired by the
operator.
(2) The single weight governor is mounted on the front of the blower and is driven by the upper blower
rotor.
(3) The governor consists of four sub-assemblies:
(a)
Control Housing Cover.
(b)
Control Housing.
(c)
Weight and Housing.
(d)
Variable Speed Spring Housing and Shaft.
b. Operation
(1) The 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) 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.
(3) 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.
c. Lubrication
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.
3-2434
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