BRP Johnson J30TEL4SUA 2007 Service Manual page 96

ELECTRICAL
STARTER MOTOR
Use vernier calipers to measure the commutator
outside diameter.
If the measurement is less than the service limit,
replace the armature.
Commutator Outside Diameter
Standard
Service Limit
Check that the mica (insulator) between the seg-
ments is undercut to the correct depth.
If the measurement exceeds the service limit, cut
the mica to the specified depth.
Mica Undercut Depth
Standard
0.02 - 0.03 in.
Service Limit
1
2
1. Segment
2. Mica
3. Undercut
94
( )
1.18 in. 30 mm
( )
1.14 in. 29 mm
001713
( )
0.5 - 0.8 mm
( )
0.01 in. 0.2 mm
3
001714
WARNING
To avoid personal injury, wear eye protec-
tion and set compressed air pressure to
less than 25 psi (172 kPa).
Use compressed air to remove all particles of
mica and metal from the armature.
Check for continuity between the commutator and
the armature core and shaft. Replace the arma-
ture if continuity is indicated.
1
3
1. Armature core
2. Commutator
3. Shaft
Check for continuity between the adjacent com-
mutator segments. Replace the armature if no
continuity is indicated.
2
001715
001716