2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 502Get this manual
REAR DRIVING MECHANISM FIN AL GEAR CASE ASSEMBLY NO TE: hen the gear set, bearing, ando gear case has been replaced, chec the tooth contact patte rn check (page 19- 18 JCheck he gea backlash (page 19 16)Kevp dust and a,rt 0;101 the c"se and
Clean the at ing surface of he gear case and cover,
bei ng ca reful not to da mage them Blo co pressed ai th ro ugh the bre athe ho les in th gear case and cover
Install he prope rin gear shims nto the rin gea and in stall hem into the gear case
Coat new O-ring with grease and install it into the co ver grooveInstail he case cover on to the gear case
Apply locking age nt to the threads of the two 10 mm bollsIf I" InlfJOWIn! to