Owner's manual

7
12095-10
60706-230
MAINTENANCE
GENERAL
Themaincomponentsofthegeneratorare:eld
frame,eldcoils,armature,brushes.brushholder
assembly, brackets, armature, and generator cooling
fan.
BRUSHES
Under ordinary circumstances brushes will operate
for thousands of hours without requiring replace-
ment.Theyshouldbeinspectedaftertherst
1000 hours of operation, and after every 500 hours
of operation thereafter. Remove brushes one at
a time and check for length. Be sure that each
moves freely in the brush holder. Brushes should be
replaced when worn down to 3/8”. Always replace
brushes in complete sets, never singularly. When
replacing brushes be careful to reconnect the lead
wire properly. Poor contact or “skipping” between
brush and slip ring can be caused by oil and grit,
int,orotherhardcontaminantsubstancesonthe
brushes, or by the brush not being properly shaped
totthesliprings.
Remedy these defects by cleaning the rings and
brushesandthenttingthebrushestotheslipring
curvature. Place #00 sandpaper under the brushes
with the abrasive side to the brushes, and work it
back and forth until the brushes are the same shape
as the slip rings.
SLIP RINGS
The continuous copper rings located at the end of
armature are the power collector rings or ‘slip rings’.
For proper generator output, the surface of these slip
ringsmusthaveahighlypolishednish.Undersus
-
tained use, it is advisable to check and occasionally
polish ring surfaces with a crocus cloth to maintain
thenishundernormalconditions.Thisshouldnot
be required more than once each thousand hours of
operation.
ELECTRICAL TESTING
TESTING COILS FOR OPENS AND GROUNDS
1.Disconnecteldleadsfromrectier.
2. Set multi-meter to read resistance, and connect
themeterleadstotheeldleads.Ifeldisopen,
meterwillreadinniteresistance(veryhighohms),
repairorreplaceeldifitisopen.Typicalresistance
fortheseeldsvariesfrom12.8to14.1ohms.
3.Leavingonemeterleadconnectedtotheeld,
connecttheothermeterleadtotheeldshell.If
meter indicates continuity (any reading - should be
inniteresistance),theeldisgroundedandshould
be repaired or replaced. To determine which of the
eldsisgrounded,cuttheconnectorbetweenthe
two coils and retest to determine which coil has the
low resistance path.