Onan CCK Service Manual

Governor System
CONSTANT SPEED GOVERNOR
The standard governor is a constant speed governor.
Figure 11. A variable speed governor is shown in
Figure 12. If the following checks do not remedy
erratic governor operation, install a new governor
spring. Check the governor arm, linkage, throttle
shaft and lever for binding or excessive wear at con¬
necting points. A binding condition at any point will
cause the governor to act slowly and regulation will
be poor. Excessive looseness will cause a hunting
condition and regulation will be erratic. Work the arm
back and forth several times by hand while the engine
is shut off. Replace parts as needed.
FIGURE 11. GOVERNOR ADJUSTMENT LINKAGE
GOVERNOR ADJUSTMENTS
Where engine speed is governor controlled, the
governor is set at the factory to allow a nominal
engine speed of 2400 rpm at no-load operation
(unless another speed is specified when the engine is
ordered). Proper governor adjustment is one of the
most important factors in maintaining the power and
speed desired from the engine, Figure 11.
FIGURE 12. VARIABLE SPEED GOVERNOR
Before making governor adjustment, run the engine
about 10 minutes to reach norma! operating
temperature. Be sure carburetor main load and idle
needles are properly adjusted before checking or
adjusting governor system. For an accurate governor
adjustment, a reliable instrument, tachometer for
example, is required.
If the following checks don’t remedy erratic opera¬
tion, install a new governor spring. Springs become
fatigued with age.
Linkage
Check the governor arm, linkage, throttle shaft and
lever for a binding condition or excessive slack and
wear at connecting points. Figure 11. A binding
condition at any point will cause the governor to act
slowly and regulation will be poor. Excessive
looseness will cause a hunting condition and regula¬
tion will be erratic. Work the arm back and forth
several times by hand while the engine is idle. Replace
parts as needed.
The engine starts at wide open throttle. The length of
the linkage connecting the governor arm to the
throttle arm is adjusted by rotating the ball joint.
Adjust length so with the engine stopped and tension
on the governor spring, the carburetor throttle lever is
wide open. This setting allows immediate control by
the governor after starting and synchronizes travel of
the governor arm and the throttle shaft.
The adjustable governors use the same procedure for sensitivity
adjustment but the speed adjustment for the variable speed
governor {Figure 13) is different If engine has variable speed
governor as shown, proceed to Variable Speed Governor Adjust¬
ment.
16

Onan CCK Specifications

General

Cylinders	2
Ignition System	Battery ignition
Fuel Type	Gasoline
Cooling System	Air-cooled
Fuel System	Carburetor
Starter	Electric
Governor	Mechanical
Max RPM	1800 RPM
Engine Type	4-cycle
Bore and Stroke	3.25 x 3.625 inches (82.55 x 92.08 mm)