Kohler Command CH20 Service Manual page 30

Governor System
GOVERNOR
These engines are equipped with an electronic governor or a mechanical governor.
Governor Components
A Throttle Lever
E Governor Spring
I Governor Gear
Electronic Governor
M
Assembly
Linkage Retaining
Q
Bushing
Mechanical Governor
Engine is equipped with a centrifugal fl yweight
mechanical governor. It is designed to hold engine speed
constant under changing load conditions. Governor gear/
fl yweight mechanism is mounted inside crankcase on
closure plate, and is driven off gear on camshaft.
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 carburetor 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
30
D
G
A
F
E
B
C
B Throttle Linkage
F Governed Idle Spring
Locking Tab Thrust
J
Washer
Digital Linear
N
Actuator (DLA)
Throttle Lever
R
Adapter
KohlerEngines.com
J
I
K
H Inside Engine
O
N
B
C Governor Lever
G Control Bracket
K Governor Gear Shaft
O DLA Bracket
Governor Control
S
Unit (GCU)
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 carburetor.
2. Loosen nut holding governor lever to cross shaft.
3. Move governor lever toward carburetor as far as it
will go (wide open throttle) and hold in this position.
L
M
P
R
Q
S
D Choke Linkage
H Regulating Pin
L Idle Solenoid
P Linkage Spring
24 690 30 Rev. G