Kohler COMMAND CH18-745 User Manual download pdf (Page 43)

5.10

Section 5

Fuel System and Governor

Reassembly

Reassemble the carburetor using the following steps.

See Figure 5-9.

1. Assemble the fuel inlet needle to the float tab.

Install the float, float shaft and inlet needle to the

air horn. Tighten the screw. Check float height

using the procedure found previously in the

‘‘Adjustments’’ subsection.

2. Install the slow jet with the stepped end toward

the bottom of the carburetor. Make sure jet is fully

seated.

3. Install the low idle adjusting needle and spring.

4. Assemble the upper body onto the lower

carburetor body using the four screws. Torque the

screws to 1.7 N·m (15 in. lb.).

5. Install the carburetor on the engine following the

procedures in Section 11 – ‘‘Reassembly.’’

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 5.12 and 5.13. 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.

Figure 5-9. 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

5-9.

• 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.

• 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.

Cross Shaft

Governor Spring

Governor Arm

Throttle

Linkage

Hex. Nut

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 217 218

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Kohler COMMAND CH18-745 User Manual Page 43

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