Checking The Clutch Boss; Checking The Pressure Plate; Checking The Primary Drive Gear; Checking The Primary Driven Gear - Yamaha MTN850-A 2017 Service Manual

2. Check:
• Oil pump drive sprocket "1"
Cracks/damage/wear  Replace.
3. Check:
• Bearing
Damage/wear  Replace the bearing and
clutch housing.
EAS30353

CHECKING THE CLUTCH BOSS

1. Check:
• Clutch boss splines
Damage/pitting/wear  Replace the clutch
boss.
TIP
Pitting on the clutch boss splines will cause er-
ratic clutch operation.
EAS30354

CHECKING THE PRESSURE PLATE

1. Check:
• Pressure plate 1 "1"
• Pressure plate 2 "2"
Cracks/damage  Replace.
• Bearing "3"
Damage/wear  Replace.
EAS30356

CHECKING THE PRIMARY DRIVE GEAR

1
1. Check:
• Primary drive gear
Damage/wear  Replace the crankshaft and
clutch housing as a set.
Excessive noise during operation  Replace
the crankshaft and clutch housing as a set.
EAS30357

CHECKING THE PRIMARY DRIVEN GEAR

1. Check:
• Primary driven gear "1"
Damage/wear  Replace the clutch housing
and crankshaft as a set.
Excessive noise during operation  Replace
the clutch housing and crankshaft as a set.
EAS30358
CHECKING THE PULL LEVER SHAFT AND
PULL ROD
1. Check:
• Pull lever shaft pinion gear teeth "1"
• Pull rod teeth "2"
Damage/wear  Replace the pull rod and
pull lever shaft as a set.
5-45
1
2
CLUTCH
3
1