Yamaha YFM4FAR Service Manual page 250

Troubleshooting chart
When basic condition "a" and "b" exist, check the following points:
Elevate and spin both wheels. Feel for
wheel bearing damage.
Check the wheel nuts and hub nuts for
tightness.
Check the constant velocity joints. Feel for
bearing damage.
Check the rear brake adjustment.
Check the rear axle. Feel for bearing
damage.
Remove the rear axle. Check for axle
bearing damage.
Remove the drive shaft components.
NO
YES
YES
YES
YES
NO
TROUBLESHOOTING
YES
Replace the wheel bearings.
(Refer to "STEERING SYSTEM" and
"REAR SHOCK
SWINGARM" in CHAPTER 8.)
NO
Torque to specification.
(Refer to "FRONT AND REAR WHEELS"
in CHAPTER 8.)
NO
Constant
differential gear bearings are probably not
damaged. Repeat the test or remove the
individual components.
NO
Adjust per instructions.
(Refer to
BRAKE" in CHAPTER 3.)
NO
Rear axle bearings and rear drive shaft
bearings are probably not damaged.
Repeat the test or remove the individual
components.
Replace the rear axle bearings.
YES
(Refer to "REAR AXLE/FINAL DRIVE
GEAR AND DRIVE SHAFT".)
7 - 3
DRIV
ABSORBER
velocity joint bearings
"ADJUSTING THE
AND
and
REAR