Mechanical Governor; Inside Engine - Kohler Command Pro ECV850 Service Manual

MECHANICAL GOVERNOR

Governed speed setting is determined by position of throttle control. It can be variable or constant, depending on
engine application.
Governor is designed to hold engine speed constant under changing load conditions. Governor gear/fl yweight
mechanism is mounted inside oil pan and is driven off gear on camshaft.
Components

Inside Engine

K J
I
H
G
F
D
C
A Governor Lever
Speed Control
E
Linkage
I Governor Gear
This governor design works as follows:
● Centrifugal force acting on rotating governor gear assembly causes fl yweights to move outward as speed
increases. Governor spring tension moves them inward as speed decreases.
● As fl yweights move outward, they cause regulating pin to move outward.
● Regulating pin contacts tab on cross shaft causing shaft to rotate.
● One end of cross shaft protrudes through crankcase. Rotating action of cross shaft is transmitted to throttle lever of
throttle body through external linkage.
● When engine is at rest, and throttle is in FAST position, tension of governor spring holds throttle plate open. When
engine is operating, governor gear assembly is rotating. Force applied by regulating pin against cross shaft tends to
close throttle plate. Governor spring tension and force applied by regulating pin balance each other during
operation, to maintain engine speed.
● When load is applied and engine speed and governor gear speed decreases, governor spring tension moves
governor lever to open throttle plate wider. This allows more fuel into engine, increasing engine speed. As speed
reaches governed setting, governor spring tension and force applied by regulating pin will again offset each other to
hold a steady engine speed.
19 690 01 Rev. --
B Governor Spring
F Throttle Lever
J Flyweight
KohlerEngines.com
E
C
A
B
C Governor Linkage
G Governor Gear Shaft
K Regulating Pin
Governor System
D
D Linkage Spring
Locking Tab Thrust
H
Washer
57