Checking The Brush - Yamaha 55DEHD Service Manual

ELEC
2. Measure the commutator diameter a.
Replace the armature if below specifica-
tion limit.
a
Digital caliper 1:
90890-06704
Standard diameter a:
33.0 mm (1.30 in)
Wear limit:
31.0 mm (1.22 in)
3. Measure the commutator undercut b.
Replace the armature if below specifica-
tion limit.
Standard undercut b:
0.8 mm (0.03 in)
Wear limit:
0.2 mm (0.01 in)
8-15
Electrical systems
1
6F680175
b
6F680180
4. Check the armature for continuity.
Replace the armature if it is not shown in
the chart below.
c
d
Armature continuity:
Tester probe
Segment–Segment
Segment–
Armature core
Segment–
Armature shaft

Checking the brush

1. Measure the brush length a. Replace
the brush assembly if below specification
limit.
Standard length a:
16.0 mm (0.63 in)
Wear limit:
12.0 mm (0.47 in)
f
e
69R80320
c d e f
6885J11