Onan MEP-003A - Page 58

TM5-6115-585-34
NAVFAC P - 8-262-12
TO - 35C2-3-455-2
TM
- 05684C
- 34
( 2 ) Press bearing ( 30 ) into pinion housing ( 22 ) .
( 2 ) Repairing Armature . If wear or runout on
the commutator is not excessive , it may be resurfaced
as follows .
( 3 ) Slide
drive
assembly ( 29 ) onto
shaft
of
arma
ture
( 27 ) . Install
stop
and
lock
ring
( 28 ) on
the
end
of
the
armature
shaft
( 27 ) .
( a ) Resurfacing Commutator . Turn commutator
down in a lathe . Commutator must not be turned down
to less than 1-1 / 16 inches .
( b ) Undercutting Mica . After resurfacing com
mutator , undercut mica to a depth 0.025 to 0.032 inch
below surface
of
commutator using
a
power
-
driven
undercutting tool . If a power - driven tool is not avail
able , mica may be undercut by hand . See figure 5-7 .
( 4 ) Install thrust washer ( 21 ) on the end of the
armature shaft ( 27 ) . Slip yoke ( 26 ) onto drive assem
bly ( 29 ) and install both in pinion housing ( 22 ) . Install
pin ( 25 ) in pinion housing ( 22 ) to hold yoke ( 26 ) in
place .
(
5
)
If
brushes
(
20
)
are
excessively
worn
,
cut
brush
leads
1
inch
from
the
welded
connection
(
see
figure
5-9
)
.
Install
new
brushes
as
follows
:
NOTE
( a ) Using rosin core solder and a soldering
iron , or heavy duty soldering gun , tin the remaining
sections of the original brush lead .
Use care in undercutting . Do not widen com
mutator slots by removing metal from bars ,
and do not leave a thin edge of mica next to
bars . Figure 5-8
illustrates examples
of good
and bad undercutting . After mica has been
undercut , remove all copper and mica parti
cles with compressed air . Polish commutator
in a
lathe
with
number
00 to 000
sandpaper
while
the
armature
is
rotating
.
( b) Position the new brush lead next to the
tinned sections of the original brush lead . Install and
crimp the brass strip connectors ( included ) around
both leads to hold the new brushes in place . See fig
ure 5-9 ,
g . Reassembly
( see
figure
5-1
) .
( 1 ) Before assembly , soak bronze bearing ( 30 )
in SAE 10 oil for 15 minutes .
( c ) Solder the new brushes in place . Position
the brush leads so they do not contact the frame or
interfere with thru bolt installation .
CUT
LEADS
1
"
FROM
CONNECTION
NEW BRUSH LEAD
a
모
5
BRASS STRIP
Ft
ORIGINAL
BRUSH LEAD
FIELD COIL
BRUSH
REMOVAL
TWO BRUSH
CONNECTION
BRUSH INSTALLATION
TS
6115-585-34
/ 5-9
Figure
5-9
. Brush
Replacement
5-7