Yamaha F40BWHD - Measuring the Brushes

–+
ELEC
8-27
STARTER MOTOR
E
2. Check:
• Commutator undercut
Dirt/foreign matter → Clean.
(with compressed air)
3. Measure:
• Commutator undercut
Out of specification → Replace the
armature.
4. Check:
• Armature continuity
Out of specification → Replace.
MEASURING THE BRUSHES
1. Measure:
• Brush length
Out of specification → Replace the
brush assembly.
Commutator undercut limit
0.8 mm (0.03 in)
a
b
a
c
Armature continuity
Commutator
segments
Continuity
Segment -
Armature core
No continuity
Segment -
Armature shaft
No continuity
a
b
c
a
Brush length limit
6.4 mm (0.25 in)
a