Kohler Comand Pro CH1000, Service Manual

Page: 46 / 142

5.16
Section 5
Fuel System and Governor
• One end of the cross sha ft protrudes through the
crankcase. The rotating action of the cross sha ft is
transmi tt ed to the thro tt le lever of the carburetor
through the external thro tt le linkage. See Figure
5-36.
Governed Governed
Idle Spring
Idle Spring
Governor Governor
Spring
Spring
Governor Governor
Lever
Lever
Cross Shaft Cross Shaft
Figure 5-36. Governor Linkage (Air Cleaner
Removed for Clarity).
• When the engine is at rest, and the thro tt le is
in the fast position, the tension of the governor
spring holds the thro tt le plate open. When the
engine is operating, the governor gear assembly
is rotating. The force applied by the regulating
pin against the cross sha
ft tends to close the
thro tt le plate. The governor spring tension and
the force applied by the regulating pin balance
each other during operation, to maintain engine
speed.
• When load is applied and the engine speed and
governor gear speed decreases, the governor
spring tension moves the governor arm to open
the thro
tt le plate wider. This allows more fuel
into the engine, increasing the engine speed.
As the speed reaches the governed se
tt ing, the
governor spring tension and the force applied by
the regulating pin will again o
ff set each other to
hold a steady engine speed.
Adjustments
NOTE: Do not tamper with the governor se tt ing.
Overspeed is hazardous and could cause
personal injury.
General
The governed speed se tt ing is determined by the
position of the thro tt le control. It can be variable or
constant, depending on the engine application.
Initial Adjustment Procedure
Make this adjustment whenever the governor arm is
loosened or removed from the cross sha
ft . See Figure
5-36 and adjust as follows:
1. Make sure the thro tt le linkage is connected to
the governor arm and the thro tt le lever on the
carburetor.
2. Loosen the hex nut holding the governor lever to
the cross sha ft .
3. Move the governor lever toward the carburetor
as far as it will go (wide open thro tt le) and hold
in this position.
4. Insert a long thin rod or tool into the hole on the
cross sha ft and rotate the sha ft clockwise (viewed
from the end) as far as it will turn, then torque
the hex nut to
7.3 N·m (65 in. lb.) .
High Speed (RPM) Adjustment
1. With the engine running, move the thro tt le
control to fast . Use a tachometer to check the
RPM speed.
2. Turn the inner adjustment screw outward to
decrease, or inward to increase the RPM speed.
Check RPM with a tachometer.
3. Stop when the desired RPM speed is obtained.
See Figure 5-37.
High Speed (RPM)
Adjustment Screw
Figure 5-37. High Speed RPM Adjustment (Air
Cleaner Removed For Clarity.