Kohler Command PRO CH620-CH740 Owner's Manual page 37

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.
Governor Components
H Inside Engine
A Throttle Lever
E Governor Spring
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 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 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.
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.
4. Insert a long thin rod or tool into hole on cross shaft and rotate shaft counterclockwise (viewed from end) as far as
it will turn, then torque nut to 6.8 N·m (60 in. lb.).
24 690 06 Rev. K
J
I
K
B Throttle Linkage
F Governed Idle Spring
Locking Tab Thrust
J
Washer
KohlerEngines.com
D
A
G
E
B
F
C
C Governor Lever
G Control Bracket
K Governor Gear Shaft
Governor System
D Choke Linkage
H Regulating Pin
29