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 TM 55-1905-221-14-2
5-29. ENGINE SPEED GOVERNOR.
GENERAL
a. The limiting speed mechanical governor illustrated is a single weight-type governor, and performs the following
functions:
(1)
Controls the engine idling speed.
(2)
Limits the maximum operating speed of the engine.
b. The governor is mounted on the front end of the blower, and is driven by the upper blower rotor. The governor
consists of three subassemblies:
1. Control Housing Cover
2. Control Housing
3. Weights and Housing
c. The governor provides full fuel for starting when the speed control lever is in the idle position. Immediately
after starting, the governor moves the injector racks to the position required for idling.
d. Operation.
(1) The centrifugal force of the revolving governor weights (1) is converted into linear motion which is transmitted
through the riser (2), and operating shaft (3) to the operating shaft lever (4). One end of lever (4) operates against the
high and low speed springs (5 and 6), through the spring cap (7), while the other end provides a moving fulcrum on which
the differential lever (8) pivots. (2) When the centrifugal force of the revolving governor weights balances out the tension
on the high or low speed spring (depending on the speed range), the governor stabilizes the engine speed for a given
setting of the governor control lever.
(3) In the low speed range, the centrifugal force transmitted operates the low speed spring. As the engine speed is
increased, the centrifugal force compresses the low speed spring (5) until the spring cap (7) is tight against the high
speed plunger (8). This removes the low speed spring from operation and the governor is then in the intermediate speed
range. In this range the centrifugal force is operating against the high speed spring and thus the engine speed is
manually controlled.
(4) As the engine speed is increased to a point where the centrifugal force overcomes the pre-load of the high
speed spring, the governor will move the injector racks out to the position required for maximum no-load speed.
5-512
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