2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 340Get this manual
DRIVETRAIN SYSTEM Coat new a-rings wi th engine oil and install them
o nto the joint pipe Install the jo int pipe into th il pump
App ly liquid seala nt (Three Bond 1215 01 equiva rentto the mating surface of the crankcase cover