Onan CCK Service Manual

Starting System
ELECTRIC STARTING
Engines beginning with Spec J use the solenoid-shift
starter shown in Figure .41. When the starter button is
pushed, battery current energizes the start solenoid.
The solenoid causes an arm to push the starter pinion
into the flywheel ring gear. Simultaneously, the start
solenoid contacts close and aiiowthestartermotorto
start turning. The starter remains engaged until the
start button is released. An overrunning dutch
protects the starter from damage before it can be
disengaged from the flywheel.
Prior to Spec J, the starter motor on electric start
engines was the gear drive starter shown in Figure 42.
START BUTTON
FIGURE 41. SOLENOID-SHIFT STARTER
The gear drive is mounted on a shaft which extends
from the starter motor. When not running, the drive
pinion gear is retracted so it dears the flywheel ring
gear. When starting, a spiral spring through in¬
creasing speed forces the drive pinion to engage the
flywheel ring gear. The pinion and flywheel ring gear
teeth have beveled ends that ensure their engaging
properly.
Starter motors are not designed for
continuous operation. Do not oper¬
ate more than 30 seconds per “ON” cycle. Do not
operate starter more than 10 seconds in a stall condi¬
tion if engine will not rotate. Serious damage could
result if these time limits are exceeded.
Maintenance: For proper cranking motor operation
with a minimum of trouble, a periodic maintenance
procedure should be followed. Periodic lubrication,
STARTING MOTOR
FIGURE 42. GEAR-DRIVE STARTER
and inspection of the brushes and commutator as
described in this section will ensure long cranking
motor life. Periodic disassembly (see Disassembly) of
the cranking motor lor a thorough overhaul is
recommended as a safeguard against accumulations
of dust, grease and parts wear.
Lubricate all oil-type bearings with 8 to 10 drops of
light engine oil {SAE 20). All oil-less type bearings
and bushings should be given a few drops of light oil.
Lubricate the cranking motor drives with a few drops
of light engine oil.
Never oil the commutator. Oil on the commutator reduces the
cranking ability of the motor.
The commutator can be cleaned by using numberOO
sandpaper. Never use emery cloth. If the commutator
is out of round or has high mica, remove it from the
cranking motor. Turn the commutator down on a
lathe being careful to remove only enough material to
true up the commutator and remove high mica.
It is not necessary to undercut mica on starter motor commutators.
Replace worn brushes. If brushes wear rapidly, check
for excessive brush spring tension and roughness or
high mica on the commutator.
Solenoid Shift: Periodically inspect solenoid and shift
lever to make sure they are operating properly. Keep
the solenoid shift lever free of dirt and excess grease.
45

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)