Yamaha F60A - Checking the Armature; Checking the Brushes

ELEC
Electrical systems
– +
91
69W3D1X
Checking the armature
1. Check the armature axial free play.
Replace the washers and shim(s)
3
if
out of specification.
2. Check the commutator for dirt. Clean
with #600 grid sandpaper and com-
pressed air if necessary.
3. Measure the commutator diameter.
Replace the armature if out of specifica-
tion.
4. Measure the commutator undercut
a
.
Replace the armature if out of specifica-
tion.
5. Check the armature for continuity.
Replace if out of specifications.
Checking the brushes
1. Measure the brush length. Replace the
brush assembly if out of specification.
Dial gauge set
1
: 90890-01252
Magnet base
2
: 90890-06705
Free play limit: 0.6 mm (0.024 in)
Diameter limit: 32.0 mm (1.26 in)
Commutator undercut limit:
0.2 mm (0.01 in)
Armature continuity
Commutator segments
b
Continuity
Segment –
Armature core
c
No continuity
Segment –
Armature shaft
d
No continuity