Yamaha 2014 MT-07, Руководство по обслуживанию

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ELECTRIC STARTER
5-48
EAS30325
CHECKING THE STARTER MOTOR
1. Check:
• Commutator
Dirt
→
Clean with 600 grit sandpaper.
2. Measure:
• Mica undercut “a”
Out of specification
→
Cut the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commutator.
TIP
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
3. Measure:
• Armature assembly resistances (commutator
and insulation)
Out of specification
→
Replace the starter
motor.
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Measure the armature assembly resistances
with the digital circuit tester.
b. If any resistance is out of specification, re-
place the starter motor.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
4. Measure:
• Brush length “a”
Out of specification
→
Replace the brush
holder set.
5. Measure:
• Brush spring force
Out of specification
→
Replace the brush
holder set.
6. Check:
• Gear teeth
Damage/wear
→
Replace the starter motor.
Mica undercut (depth)
0.70 mm (0.03 in)
Digital circuit tester
90890-03174
Model 88 Multimeter with ta-
chometer
YU-A1927
Armature coil
Commutator resistance “1”
0.015–0.025
Ω
Insulation resistance “2”
Above 1 M
Ω
at 20 °C (68 °F)
a
Brush overall length
12.0 mm (0.47 in)
Limit
6.50 mm (0.26 in)
Brush spring force
6.03–6.52 N (615–665 gf, 21.71–
23.47 oz)
M
1
2
a
a