Onan CCK Series - Periodic Service Continued; Generator Commutator and Brush Maintenance; Neutral Brush Position Adjustment; Generator Bearing Information

42
PERIODIC SERVICE
: BE SURE TUBE
NOT MAKE CON-
TACT WITH
VALVE DISC.
FIG. 29::':SERVICING THE CRANKCASE BREATHER VALVE
GENERATOR. - Check
the condition of the commutator (and collector
rings onACplarits). Clean the brush contact surface
with a dry, lint free cloth, If heavily coated, or slightly rough, sand
smooth with4fOO sandpaper. Do not use emery or carborundum cloth
or 'Paper.
Install new commutator brushes and other rectangular brushes when the
old ones are worn t05 /8" or less in length. .
See that all connections are tight. Remove carbon dust from the gener-
ator.
NEUTRAL BRUSHPOSITION.-Brushes will arc excessively and brush
wear will be rapid if the btushrig is
moved from its original "neutral" position as marked at the factory.
CAUTION
If a new
armature or brush rig is installed, the "neutral brush position"
mu,st be re-Iocated and re-marked. Neutral brush pOSition is that point
at which the least arCing of the brushes occurs .. Ifa voltmeter is avail-
able, the brush rig should be set at the point where highest voltage is
generated. If a voltmeter is not available, set the brush rig at the point
.
where the brushes show the least arcing.
GENERATOR BEARING. - The generator bearing is pre-lubricated
and sealed. It requires no periodic ser-
vicing during its service life.