Checking The Drive Shaft; Checking The Final Gear Case; Measuring And Adjusting The Final Gear Lash - Yamaha YXR70FX Service Manual

REAR CONSTANT VELOCITY JOINTS, FINAL DRIVE
GEAR AND DRIVE SHAFT

CHECKING THE DRIVE SHAFT

1. Check:
• drive shaft (splines)
• coupling gear (splines)
Wear/damage → Replace.

CHECKING THE FINAL GEAR CASE

1. Check:
• final gear case
• ring gear bearing housing
Cracks/damage → Replace.
TIP:
When the final gear case and/or the ring gear
bearing housing are replaced, be sure to
adjust the shim of the final drive pinion gear
and/or ring gear.
2. Check:
• gear teeth
Pitting/galling/wear → Replace the drive
pinion gear and ring gear as a set.
• oil seals
• O-rings
Damage → Replace.
3. Check:
• bearings
Damage → Replace.
TIP:
• Roller bearings may be reused, but Yamaha
recommends installing new ones. Do not
reuse the oil seals.
• When the final drive pinion gear and/or ring
gear are replaced, be sure to adjust the shim
of the final drive pinion gear and/or ring gear.
MEASURING AND ADJUSTING THE FINAL
GEAR LASH
Measuring the final gear lash
1. Secure the gear case in a vise or another
supporting device.
2. Remove:
• drain plug
• gasket
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DRIV