2006 Honda TRX680 Rincon Factory Service Manual, Page 443Get this manual
BRAKE SYSTEM Coat new O-ring with molybdenum disulfide grease and install it into the propeller shaft groovePut the final drive assembly on floor jack or other adjustable support and place the assembly under the main frameWhile adjusting the jack height, move the final drive assembly forward and connect the propeller shaft into the universal joint
Be careful not to disconnect the propeller shaft and universal joint
Set the final drive assembly into the main frame and seat the propeller shaft securely to align the bolt holes, then insert the mounting bolts from the left sideInstall new mounting nuts but do not tighten them yetRoute the breather hoses properly (page 1-20) and connect them