Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 331

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 front constant velocity joint. Feel
for bearing damage.
Check the rear brake adjustment.
Check the rear constant velocity joint. Feel
for bearing damage.
Remove the drive shaft components.
TROUBLESHOOTING
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
7 - 3
Replace the wheel bearing.
(Refer to "STEERING SYSTEM" and
"REAR KNUCKLE AND STABILIZER" in
CHAPTER 8.)
Torque to specification.
(Refer to "FRONT WHEELS AND BRAKE
DISCS" and "REAR
BRAKE DISC" in CHAPTER 8.)
Constant velocity joint bearings and differ-
ential gear bearings are probably not dam-
aged. Repeat the test or remove the
individual components.
Adjust per instructions.
(Refer to "ADJUSTING
BRAKE" in CHAPTER 3.)
Constant velocity joint bearings and final
drive gear bearings are probably not dam-
aged. Repeat the test or remove the indi-
vidual components.
DRIV
WHEELS AND
THE REAR