Onan CCK Service Manual

ELECTRIC STARTER INSPECTION AND
TROUBLESHOOTING
Testing the Armature for Shorls: Place the armature
in the growler and hold a thin steel blade parallel to
the core and just above it, while slowly rotating the
armature in the growler, Figure 48. A shorted ar¬
mature causes the blade to vibrate and move toward
the core. A shorted armature must be replaced.
FIGURE 48. TEST FOR SHORTED ARMATURE
Testing Armature for Grounds: Touch armature shaft
or core and the end of each commutator bar with a
pair of ohmmeter leads, Figure 49. If the ohmmeter
reading is low, it indicates a grounded armature.
Reolace grounded armature.
FIGURE 49. TEST FOR GROUNDED ARMATURE
Testing the Armature for Open Circuit: The most
common place for an open circuit to occur is at the
commutator riser bars. Inspect the points where the
conductors are joined to the commutator bars for
loose connections.
Testing Commutator Runout Place the commutator
in a test bench and check runout with a dial indicator
(Figure 50). When commutator runout exceeds .004
inch, reface the commutator.
Testing Armature Shaft Runout: The armature shaft
as well as the commutator may be checked. A bent
armature can often be straightened, but if the shaft is
worn, a new armature is required. Figure 51.
FIGURE 51. CHECKING ARMATURE SHAFT RUNOUT
Testing Field Coils for Grounds: Place one test prod
on the connector and the other on a clean spot on the
frame after unsoldering shunt field coil wire. If the
ohmmeter indicates continuity, the fields are ground¬
ed either at the connector or in the windings, Figure
52.
48

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)