2007-2008 Yamaha YFM700 Grizzly Factory Service Manual, Page 323Get this manual
FRONT CONSTANT VELOCITY JOINTS AND DIFFERENTIAL GEAR EBS00166
CHECKING THE DIFFERENTIAL GEARS 1Check: gear teeth Pittinggallingwear Replace bearing Pittingdamage Replace oil seal O-ring Damage Replace2Check: front drive shaft splines differential drive pinion gear splines Weardamage Replace spring Fatigue ReplaceMove the spring up and down3Check: front drive shaft Bends ReplaceWARNING
Do not attempt to straighten bent shaft; this may dangerously weaken the shaft