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 TM 55-1905-220-14-5
3-66. GOVERNOR HYDRAULIC - MAINTENANCE INSTRUCTIONS.
a. The governor is the isochronous hydraulic type with speed droop stabilization. Hydraulic action is
transmitted by oil which is admitted under pressure from the engine lubricating system to an auxiliary oil pump
in the governor. The pump then develops the oil pressure necessary to actuate the governor mechanism.
b. The isochronous feature of this governor is its ability, at zero droop, to hold the engine at a constant
speed regardless of the load, providing the load is within the rated capacity of the power generator.
c. The mechanical connection of the governor to the fuel injectors is by means of a fuel rod attached to a
lever on the injector control tube.
d. The governor operates in such a manner that fuel supplied to the injectors is decreased by action of a
fuel rod spring and increased by the opposing action of the hydraulic operated power piston. Admission of oil
under the power piston is controlled by the vertical movement of the pilot valve plunger. This plunger is, in
turn, controlled by the flyweights. The flyweight ball head is mounted on the pilot valve bushing.
e. Rotation of the governor is accomplished by the upper blower rotor through an integral horizontal drive
shaft and bevel gear and an integral vertical driven shaft and bevel gear both mounted on ball bearings and
retained in a drive housing.
f. In starting a cold engine, considerable time is required for the lubricating oil pressure to become
sufficient to operate the governor and thus move the injector control racks to the full fuel position so the engine
can start. Since this delay in starting is considered objectionable, the starting time can be shortened by
pressing in on the knob which is threaded on the fuel rod and projects from the side of the governor subcap.
The inward movement of this knob takes the control of the injector fuel racks away from the governor.
g. The engine can be stopped in a similar manner, regardless of the governor, by pulling out on the fuel
rod knob.
3-1176
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