Kohler COMMAND CH18, Руководство по обслуживанию

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5.21
Section 5
Fuel System and Governor
5
Figure 5-39. Governor Linkage.
• As the flyweights move outward, they cause the
regulating pin to move outward.
• The regulating pin contacts the tab on the cross
shaft causing the shaft to rotate.
• One end of the cross shaft protrudes through the
crankcase. The rotating action of the cross shaft is
transmitted to the throttle lever of the carburetor
through the external throttle linkage. See Figure
5-39.
• When the engine is at rest, and the throttle is in
the “fast” position, the tension of the governor
spring holds the throttle plate open. When the
engine is operating, the governor gear assembly is
rotating. The force applied by the regulating pin
against the cross shaft tends to close the throttle
plate. The governor spring tension and the force
applied by the regulating pin balance each other
during operation, to maintain engine speed.
Governor Spring
Governor Arm
Throttle
Linkage
Hex Nut
Cross Shaft
Governor
General
The governor is designed to hold the engine speed
constant under changing load conditions. Most
engines are equipped with a centrifugal flyweight
mechanical governor. Some engines utilize an
optional electronic governor, which is shown and
covered on page 5.23. The governor gear/flyweight
mechanism of the mechanical governor is mounted
inside the crankcase and is driven off the gear on the
camshaft. This governor design works as follows:
• Centrifugal force acting on the rotating governor
gear assembly causes the flyweights to move
outward as speed increases. Governor spring
tension moves them inward as speed decreases.
• When load is applied and the engine speed and
governor gear speed decreases, the governor
spring tension moves the governor arm to open
the throttle plate wider. This allows more fuel
into the engine, increasing the engine speed. As
the speed reaches the governed setting, the
governor spring tension and the force applied by
the regulating pin will again offset each other to
hold a steady engine speed.
Adjustments
NOTE: Do not tamper with the governor setting.
Overspeed is hazardous and could cause
personal injury.
General
The governed speed setting is determined by the
position of the throttle control. It can be variable or
constant, depending on the engine application.
Initial Adjustment
NOTE: EFI engines require a special initial
adjustment procedure, which is covered in
subsection 5B. Refer to “Initial Governor
Adjustment” in that section for setting the
governor on EFI-equipped engines.
Procedure – Carburetor Equipped Engines
Make this adjustment whenever the governor arm is
loosened or removed from the cross shaft. See Figure
5-39 and adjust as follows:
1. Make sure the throttle linkage is connected to the
governor arm and the throttle lever on the
carburetor.
2. Loosen the hex nut holding the governor lever to
the cross shaft.
3. Move the governor lever toward the carburetor
as far as it will move (wide open throttle) and
hold in this position.
4. Insert a nail into the hole on the cross shaft and
rotate the shaft counterclockwise as far as it will
turn, then tighten hex nut securely.