Onan CCK Service Manual

The linkage must be able to move freely through Its
entire travel. Beginning Spec J, clean and lubricate
steel ball joints using a drop of light oil or graphite.
Earlier models used plastic ball joints which require
no lubrication. See Figure 12a.
lubricate with graphite.
FIGURE 12a. GOVERNOR LINKAGE
Sensitivity Adjustment
The engine speed drop from no-load to full-ioad must
be within 100 rpm. Check the engine speed with no
load connected and again after connecting a full-
rated load.
The sensitivity of the governor depends upon the
position of the arm end of the governor spring. A
series of holes in the governor arm provides for
adjustment. To increase sensitivity, move the gover¬
nor spring toward the governor shaft. To decrease
sensitivity, move the governor spring toward the link¬
age end of the governor arm.
A too-sensitive setting will result in a surging speed (hunting)
condition, an alternate increase and decrease in engine speed. An
opposite setting will result in too much speed variation between
no-load and full-load conditions.
Always recheck the speed adjustment after a sensitiv¬
ity adjustment. Increasing sensitivity will cause a
slight decrease in speed and will require a slight
increase in the governor spring tension.
Constant Speed Governor Adjustment
The speed at which the engine operates is deter¬
mined by the tension applied to the governor spring.
Increasing spring tension increases engine speed.
Decreasing spring tension decreases engine speed.
The no-load speed of the engine should be slightly
higherthan the speed requirementsofthe connected
load. For example, if the connected load is to turn at
2310 rpm, set the no-load speed of the engine at
about 2400 rpm. Check speed with a tachometer. If a
speed adjustment is needed, turn the speed adjusting
nut in to increase the speed or out to decrease the
speed {Figures 11 and 12).
Variable Speed Governor
Adjustment
These governors are adapted for use where a wide
range of speed settings is desired. Engine speed is
controlled at any given point between minimum and
maximum by simply shifting the speed control lever
until the desired speed is reached.
The adjustable governors use the same procedure for sensitivity
adjustment, but the speed adjustment for the variable speed gov¬
ernor (Figure 13) is different
The design of the variable speed governor gives an
automatic decrease in sensitivity when the speed is
increased and the result is good stability at all speeds.
Adjust the governor as follows:
1. Make sure carburetor is adjusted correctly {see
FUEL SYSTEM section).
2. Adjust the throttle stop screw on the carburetor to
a minimum idling speed of 1,450 rpm so the gov¬
ernor spring can hold the engine at 1,500 rpm. (A
lower minimum does not assure smooth opera¬
tion under load.)
3. Adjust governor spring tension for minimum
speed. Shift the lever to the minimum (slow) posi¬
tion and with no-load connected, adjust the
spring tension for about 1,500 rpm.
4. Adjust the sensitivity while operating at minimum
speed to attain the smoothest no-load to full-load
operation as follows:
To decrease sensitivity {allow more speed drop
from no-load to full-load operation): Move the
governor spring outwards into a different groove
or hole in the extension (or on earlier models, turn
the sensitivity screw outwards) so that the point
of puli by the spring is moved slightly farther from
the governor shaft.
To increase sensitivity (closer regulation by the
governor which permits less speed drop from no-
load to full-load operation): Move the governor
spring inward into a different groove or hole in the
extension (or on earlier models, turn the sensitiv¬
ity screw inward) so that the point of puli by
spring is moved slightly closer to the governor
shaft.
5. A pply a full-load and shift the speed control lever
until the engine speed reaches the desired maxi¬
mum speed. Set the screw in the bracket slot to
stop lever travel at the desired maximum full-load
speed position. A full-load speed of 3600 rpm is
the recommended maximum for continuous
operation. The speed must agree with the load
requirements.
17

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)