Onan CCK Series User Manual

44
ADJUSTMENTS
As the load on the plant is increased, the engine vacuum becomes less,
and booster internal spring tension overcom~s the pull of the diaphragm,
and tension is put on the booster external sptiIig. The tension on the ex-
, ternal spring "helps" the· regular governor spring in its function, thus
causing a slight increase in engine speed as the load is increased.
A binding in the bearings of the governor shaft, in the ball joint, or in
the carburetor throttle assembly will cause ~rratic governor action or
alternate increase and decrease in speed (huhting). 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 gover-
nor action isstiU erratic, replacing the spring with a new one and reset-
ting the adjustments will usually· correct the ,trouble.
2. STEPS TO FOLLOW. -
This gives tlie p~ocedure only briefly. Refer
to the details on 'eac.hsubject herein.
. .
a. Adjust the carburetor main jet for the best fuel mixture while oper-
ating the plant with a full rated load connected.
b. Adjust the carburetor idle needle with no load connected.
c.Adjust the length of·the governor linkage.
d, Check the governor linkage and throttle shaft for binding or exces- .
sive looseness.
e, Adjust the governor spring tension for rated speed at no load opera-
tion with booster disconnected (or held inoperative).
f.Adjust the governor sensitivity. .
g.
Recheck the speed adjustment.
h. Set the carburetor thr6ttle stop screw.
i. Setthe vacuum speed-booster.
3. LINKAGE. - The engine starts at wide open throttle. The length of
the linkage connecting the governor arm to the thr'otUe
shaftand ievertsadjusted by rotating the ball joint. Adjust this length
so that withthe engine stopped and tension on the governor spring, the
stop on the. carburetor throttle shaft just contacts the underside of the.
carburetor bowl, as illustrated. ,This setting allows immediate control
by the governor after starting. It also synchronizes the travel of the .
.
governor arm and the throttle shaft.
4. SPEED ADJUSTMENT. - With the warmed-up plant operating at no
load, and with
the booster external sprIng
. disconnected (or otherwise held inactive), adjusUhetension of the gov,..
ernor spring. Refer the Voltage Chart and the Speed Chart and select
theeolumn which corresponds to thenaineplate of the plant in question.
Turn the speed adj usting nut to obtain a voltage and speed reading with-
in the Hrriitsshown. .

Onan CCK Series Specifications

General

Fuel Type	Gasoline
Fuel System	Carburetor
Frequency	60 Hz
RPM	1800 RPM
Starting System	Electric or Recoil
Starting Method	Electric or Recoil Start
Voltage	120/240V
Compression Ratio	6.5:1
Ignition System	Battery Ignition
Phase	Single-phase