Checking The Ptt Motor - Yamaha 250GETO Service Manual

BRKT

Checking the PTT motor

1. Check the commutator. Clean with 600–
grit sandpaper and compressed air if
dirty.
2. Measure the commutator diameter.
Replace the armature if below specifica-
tion.
a
Motor commutator standard
diameter a:
25.0 mm (0.98 in)
Wear limit:
24.0 mm (0.95 in)
3. Measure the commutator undercut b.
Replace the armature if below specifica-
tion.
7-29
Bracket unit
6G480220
b
6F680180
Motor commutator standard
undercut b:
1.8 mm (0.07 in)
Wear limit: 1.2 mm (0.05 in)
4. Check the armature for continuity.
Replace if out of specifications.
c
Armature continuity
Commutator segments c
Segment c –
Armature core d
Segment c –
Armature shaft e
5. Measure the brush length. Replace if
below specification.
Motor brush standard length:
12.0 mm (0.47 in)
Wear limit f:
4.0 mm (0.16 in)
e
d
6S370140
Continuity
No continuity
No continuity
f
6S370150
6S35H11