Onan 6GO-F User Manual

MAINTENANCE AND REPAIR
GENERATOR
GENERAL.- The generator normally requir~s little maintenance other than
the PERIODIC SERVICE.
COMMUTATOR AND COLLECTOR RINGS.- After a long period of service, the
surface of the commutator may become worn to such an extent as to cause
the mica insulation between the commutator bars to extend above the
level of the bars. This condition would cause noiay brushes and would
soon
lead to excessive brush sparking and pitting of the commutator bars.
High mica should be undercut to a depth equal to the distance between
bars, or approximately 1/32". ,Lift each brush high in its guide so that
its spring will press against its side, and remove the end bell. Tag
leads to insure correct replacement. With a tool fashioned from a hack
sa.w blade. carefully undercut the mica. Be sure to remove any burrs
which may have been formed when undercutting, and see that spaces be-
tween bars are completely free of any metallic particles ..
Should dusty operating conditions cause the surface of the commutator or
cOllector rings to become grooved, out of round, pitted or rough, it will
be necessary to remove the armature and turn the commutator or collector
rings down in a lathe. It will be necessary to remove the generator
field frame before the armature can be removed. Remove the ball bearing
from the anmature shaft before turning'down to prevent any foreign ma-
terial getting into it. After the commutator is turned down, the mica
between bars must be undercut as described above. when the anmature
is reinstalled, align it as carefully as possible before installing
the frame and end, bell. '
BRUSH RIG.- It is unnecessary to remove the brush rig from the end bell
when servicing the generator., Iiit has been removed mistakenly,line
up the paint mark on the outer edge of the brush rig with the mark on the
brush rig support in the end bell. A deviation from;the proper position-
ing of the brush rig Will lead to 'excessive, arcing of ,the, brushes, burn;"
ing of the commutator, lo.w generator output, and possible irreparable
damage to the generator windings due to overheating. Any defective
condenser should be replaced with a ne:w one of tn,e same capacity.'
. .- .
BRUSHES.- ,Install new brushes when the old ones are worn so that the
top of the brush is below a point midway between the top and bottom
of the brush guide. Do not continue to use brushes that are worn too
short, because the spring tension lessens as the brush becomes ,shorter,
and ~ak spring tension leads to excessive brush sparking and pitting
of the commutator or collector rings. It is recommended that only a
moderate load be applied to the generator until the new brushes have
been "run in", to elim.i.flate excessive sparking. , See that brushes ride,
freely in their guides and that spring tension is ,uniform. The correct
tension, is 30 oz. for the commutator brush springs and 16 oz. for the
collector ring brush springs, measured with the contact point of the,
spring level with the top Of the guide.' ' ,

Onan 6GO-F Specifications

General

Brand	Onan
Model	6GO-F
Category	Inverter
Language	English