Kohler K9J 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 drive.
2. Remove both through bolts.
3. Remove the end bracket capscrew from the
end cap.
4. Remove mounting bracket and frame by rotat-
ing the end bracket and slipping the mounting
BRUSH
DETAIL
PERMANENT
MAGNETS
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. If dirty, clean it with a
coarse, lint-free cloth. If grooved, dress it with
a commutator stone or turn it down on a lathe
and undercut the mica.
/THRU BOLT
/
HIGH MOUNT TYPE
PM STARTER
MOUNTING
Figure 8-29. Permanent Magnet Starter - Exploded View.
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 housing.
2. One or a number 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-
ally, in many instances the starter brushes will
be welded or stuck in the brush holders.
Some of the frequent causes of abnormal parasitic
load at cranking are:
1 . Improper viscosity engine crankcase oil.
2. Incorrect fluid in a direct coupled hydrostatic
unit - remember, even in the idle or neutral
position, a direct coupled hydrostatic pump will
place a parasitic load on the engine at crank-
ing.
3. Malfunctioning or inoperative direct coupled
clutch assembly.
4. Engaged accessory or drive clutch assembly.
Starter failures from overcranking or cranking
against an abnormal parasitic load are not covered
8.23