2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 351Get this manual
REAR DRIVING MECHANISM
REAR AXLE INSTALLATION
Apply molybdenum disulfide grease to the center spline of the axleInstall the axle into the final gear case from the right side until it is fully seatedCENTER SPLINES
REAR AXLE Install the side collar onto the axle with the tapered side facing inwardLEFT SIDE COLLAR
Coat new O-ring with grease and install it into the gear case groove