Transmission; Autolubrication Pump; Crankshaft - Yamaha YB50 Service Manual

INSPECTION AND REPAIR

TRANSMISSION

1. Inspect:
• Drive axle
• Main axle
• Secondary pulley wheel axle
Burrs/Spalling/Non-uniformity/Wear
Change
2. Inspect:
• Secondary pulley wheel axle bearing
• Main axle bearing
• Drive axle bearing
Pivot the inner guide of the bearing.
Excessive play/Non-uniformity
Change
Pitting/Damage

AUTOLUBRICATION PUMP

Internal wear or poor operation may cause
the pump to deviate from its factory adjust-
ment. However, this is very uncommon. If
incorrect operation is suspected, inspect the
following:
1. Inspect:
• Supply line Obstruction
under
pressure
• O-ring Wear/Damage
2. Inspect:
• Drive gear teeth of the autolubrication
pump
• Gear teeth driven by autolubrication
pump
Change

CRANKSHAFT

1. Measurement:
• Deflection limit "C"
• Clearance on big end side "D"
• Limit of free play at small end of connec-
ting rod "F"
Outside specified value
Use V blocks, dial gauges and thickness
gauge.
4-16
ENG
Change
Apply air
Change
Pitting/Wear/Damage
Change.