Kohler K91 Service Manual page 93

Service the permanent magnet starter as follows .
Refer to Figure 8-29 .
1 . Remove the stop nut and the remainder of the
Bendix d rive.
2 . Remove both through bolts .
Remove the end bracket capscrew from the
3 .
end cap .
4 . Remove mounting bracket and frame by rotat­
ing the end bracket and slipping the mounting
BRUSH
DETAI L
Figure
Failure Analysis - Bendix Drive Starters
Starter failures from overcranking * or cranking with
an abnormal parasitic load * * on the engine , will
display one or a number of the following signs :
1 . The armature wire insulation or coating will ap­
pear discolored and may be swollen . In many
cases , you may be able to detect an odor
from the burnt wire coating or see it oozing
from the starter housi n g .
2 . One o r a numbe r of the armature windings
may have wires or wire connections that have
burnt in two. Wires may have insulation miss­
ing or be partially fused together .
3 . The starter brushes will show heavy surface
galling and brush material transfer. Addition-
PERMANENT
MAGNETS
DRI VE P INION
(WITHOUT DUST
STOP NUT
( 90 - 1 1 0 INCH LBS . )
Permanent Magnet Starter - Exploded View.
8-29.
bracket and frame off of the drive end of the
armature.
5 . Separate the end cap from the armature , be­
ing careful to restrain the brushes in the end
cap.
6 . Inspect the commutator. I f dirty. clean i t with a
coarse, lint-free cloth . If grooved . dress it with
a commutator stone or turn it down on a lathe
and u ndercut the mica.
/
THRU BOLT
"' "'
�
,
,
, .... ..
ally, in many i nstances the starter brushes will
be welded o r stuck in the brush holders .
Some of the frequent causes of abnormal parasitic
load at cranking are:
1 . Improper viscosity engine c rankcase oil .
2 . Incorrect fluid i n a d irect coupled hydrostatic
unit - remember, even in the idle or neutral
position a d irect coupled hydrostatic pump will
I
place a paraSitic load on the engine at crank­
i n g .
3 . Malfunctioning or inoperative d irect coupled
clutch assembly.
4 . E ngaged accessory o r drive clutch assembly.
Starter failures from overcranking or cranking
against an abnormal parasitic load are not covered
MOUNTING
/' /
8 . 23