Onan CCK User Manual

CARBURETOR
The carburetor has an adjustable idle and main jet. If
the engine runs unevenly at half or full load due to
faulty carburetion, the main adjusting screw requires
adjustment. The idle adjustment screw, normally
requires little attention otherthan a periodic cleaning.
A hunting condition (alternate increase and decrease
in engine speed) at no load can sometimes be
corrected by an idle adjustment. Make all adjustments
with the engine at normal operating temperature.
To adjust the main screw, connect a full or nearly full
load to the engine. Turn the main adjusting screw out
about two full turns. Then turn it in slowly until the
engine begins to lose power and speed. Then turn it
out slowly until theengine runs smoothly at full power
and speed. If the engine develops a hunting condition
try correcting by opening the main adjusting screw a
little more. Do not open more than 1/2 turn beyond
the maximum power point. If this does not correct the
condition, adjust the governor sensitivity.
Adjust the idle screw with no load connected to the
engine. Turn the screw in until the engine loses
considerable speed. Then turn it out until the engine
runs smoothly.
DIMENSION IS 5/16”
(METAL FLOATS
OR 1/4” (STYRAFOAM
PLASTIC FLOAT)
I CAUTION T Loosen
packing nut
before turning main fuel adjust¬
ment and tighten to a snug fit after
adjustment has been made. Hold
[ • :
11
| the adjustment while tightening
J
©
yv pacKing nui.
1-
1
J ^GASOLINE IDLE
ADJUSTMENT
-GASOLINE MAIN
ADJ USTMENT
STARTING POSITION
THROTTLE
STOP SCREW .
IDLING POSITION
THROTTLE
PLATE
A775 -1
THROTTLE
STOP BOSS _ J
MANIFOLD ^1-
_ U _
SET THIS DISTANCE
AT 1/32” WHEN PLANT IS
RUNNING AT NO LOAD
FIGURE 17. CARBURETOR ADJUSTMENTS
ELECTRIC CHOKE
If extremes in starting temperatures require a read¬
justment of the choke, slightly loosen the two cover
retaining screws. For less choking action, turn the
cover assembly a few degrees in a clockwise direc¬
tion. For more choking action, turn counterclockwise.
Retighten the cover screws.
Loosen these
screws and
rotate the
entire cover
assembly
FIGURE 18. ELECTRIC CHOKE
If the engine starts and runs roughly after a minute or two of
operation, the choke is set too rich. If the engine starts, and
assuming that fuel, ignition and compression are adequate, but the
engine sputters or stops before it warms up, the choke is set too
lean.
GOVERNOR AND BOOSTER
The governor and booster control the speed of the
engine. A speed adjustment includes adjusting both
devices (Figure 19).
Governor Adjustment
Before making adjustments, run the set about 15
minutes with a light load connected to reach normal
operating temperature. (If governor is completely out
of adjustment, make a preliminary adjustment at no
load to first attain a safe voltage operating range.)
Engine speed determines the output voltage and
current frequency of the generator. By increasing the
engine speed, generator voltage and frequency are
increased, and by decreasing the engine speed,
generator voltage and frequency are decreased'
Connect an accurate voltmeter or frequency meter
(preferably both) to the generator output in order to
correctly adjust the governor. A small speed drop not
noticeable without instruments will result in an objec¬
tionable voltage drop. Use a tachometer to check
engine speed.
A binding in the bearings of the governor shaft, in the
ball joint, or in the carburetor throttle assembly
causes erratic governor action or alternate increase
and decrease in speed (hunting). A lean carburetor
adjustment may also cause hunting. Springs of all
kinds have a tendency to lose their calibrated tension
through fatigue after long usage. If all governor and
carburetor adjustments are properly made, and the
governor action is still erratic, replacing the spring
with a new one and resetting the adjustments will
usually correct the trouble.
1. Adjust the carburetor main jet for the best fuel
mixture while operating the set with a full rated
load connected.
2. Adjust the carburetor idle needle with no load
connected.

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)