Governor System
79
62 690 05 Rev. E
KohlerEngines.com
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 crankcase and is driven off gear on camshaft.
Components
I
J
K
Inside Engine
A
B
G
F
C
D
E
H
J
K
A
Throttle Lever
B
Control Bracket
C
Throttle Linkage
D
Linkage Spring
E
Governor Gear Shaft
F
Governor Lever
G
Governor Spring
H
Idle Spring
I
Governor Gear
J
Flyweight
K
Regulating Pin
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
off set each other to hold a steady engine speed.
Governor Adjustments
NOTE: Do not tamper with governor setting. Overspeed
is hazardous and could cause personal injury.
Initial Adjustment Procedure
Make this adjustment whenever governor arm is
loosened or removed from cross shaft. Adjust as follows:
1. Make sure throttle linkage is connected to governor
arm and throttle lever on throttle body.
2. Loosen nut holding governor lever to cross shaft.
3. Move governor lever toward throttle body as far as it
will go (wide open throttle) and hold in this position.
4. Insert a long thin rod or tool into hole on cross shaft
and rotate shaft clockwise (viewed from end) as far
as it will turn, then torque nut to 7.1 N·m (63 in. lb.).
