2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 461Get this manual
FRONT DRIVING MECHANISM BEARING INSPECTION Tur the inn er race of each bearing in the ear case and cove ith our fingerTh bearin gs sho uld turn smoothly and qu ietlyAlso check th at the bearing oute race fits tig ht ly in the case or cov er
"GEAR TOOTH CONTACT PATIERN CHECK
oulrJ (rhjG8Seiln d
seoo dust ana dirt Clean sealing aterial off the mati ng su rfaces of th diffe re ntial case and cove r, being ca reful not to
LEFT SHIM
d am age th em pp ly thin coat of Prussian Blue to the pinion go at
teeth for tooth co ntact pattern checkInsta ll the ri ng gear shims onto the ifferential assembly