Onan CCKB User Manual

Float Level Adjustment
To check float level, remove the entire main fuel
adjustment assembly from the float bowl (unscrew
large nut from float bowl, Figure 14). For correct
carburetor float clearance see Figure 15. Adjustment
is made by bending the tab on the float. The float tab
should just touch fuel inlet valve and not compress
the inlet valve spring.
Do not apply excessive pressure to float valve.
BEND TAB
TO ADJUST
THIS DIMENSION
SHOULD BE 1 / 8 '
(FROM GASKET
TO FLOAT)
BOWL FLANGE
GASKET
A9I3 Rev
TAB CONTACTING
HEAD OF PIN, WITH
FULL WEIGHT OF
FLOAT COMPRESSING
INLET VALVE SPRING.
FIGURE 15. SETTING FLOAT LEVEL
Throttle Stop Screw Adjustment
Set throttle stop screw (located on carburetorthrottle
lever) with no load connected and while running at
rated speed. Turn the screw to give 1/32-inch
(0 79 mm) clearance between the screw and pin
(Figure 17).
OMAN THERMO-MAGNETIC CHOKE
This choke uses a heating element and a heat-
sensitive bi-metal spring to open the choke plate. The
choke solenoid, actuated during engine cranking
only, closes the choke plate according to ambient
temperature.
If the engine has been running, allow it to cool at least
one hour before attempting choke adjustment. Adjust
the choke as follows;
1. Remove the flame arrester and adapter (Figure
14) to expose the carburetor throat.
2. Loosen the screw that secures the choke body
(Figure 16).
3. Rotate the choke body until the proper setting is
achieved. Refer to Figure 16 for correct choke
settings at various ambient temperatures. Use
drill rod or the shank of a drill bit to measure the
choke opening.
GOVERNOR
The governor and vacuum booster control engine
speed. Rated speed and voltage appear on the
nameplate (see Specifications). On a 2 pole
generator, engine speed equals frequency multiplied
by 60 thus 3,600 rpm gives 60-cycle frequency.
Preferred speed does not vary more than 3 cycles
from no-load to full-load operation. Be sure throttle,
linkage, and governor mechanism operate smoothly.
Refer to Figure 17 and make adjustments as follows:
Linkage: 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 that with the engine stopped and
with tension on the governor spring, the stop screw
on the carburetorthrottle lever is 1/32-inch (0.79 mm)
from the stop pin. This setting allows immediate
control by the governor after starting, and syn¬
chronizes travel of the governor arm and the throttle
shaft.
Afubient Temperature (°F)
60
65
70
75
80
85
90
0 ^
15 64
Choke Opening (Inches)
1/8
9/64
5/32
11/64
3/16
13/64
7/32
Ambient Temperature (C°)
16
18
21
24
27
29
32
__35
Choke Opening (mm)
3.2
3.6
4.0
4.4
4.8
5.2
5.6
6.0
LOOSEN THIS
SCREW AND
ROTATE THE
ENTIRE COVER
ASSEMBLY
FIGURE 16 . THERMO-MAGNETIC CHOKE ADJUSTMENTS
14

Onan CCKB Specifications

General

Engine Model	CCKB
Fuel Type	Gasoline
Cooling System	Air-cooled
Phase	Single-phase
Governor Type	Mechanical
Rated RPM	1800 RPM
Frequency	60 Hz
Ignition System	Battery Ignition
Starting System	Electric
Voltage	120/240 V
Rated Output	4.0 kW (5.0 kVA)
Maximum Output	5.5 kW
Oil Capacity	2 quarts
Generator Type	Revolving field
Fuel Consumption at Full Load	0.75 GPH
Fuel Consumption at Half Load	0.4 GPH