2006 Honda TRX680 Rincon Factory Service Manual, Page 259Get this manual
SUB-TRANSMISSIONGEARSHIFT LINKAGE INSTALLATION Blow through the oil passage in the crankcase cover with compressed airClean the crankcase and cover mating surfacesApply engine oil to the lips of new oil seals, and install them into the crankcase cover until they are fully seated
Coat new O-rings with engine oil and install them into the joint collar groovesInstall the oil joint collar into the crankcaseInstall the two dowel pins and new gasketMake sure that the washers are installed on the output shaft, reverse idle shaft and gearshift spindle, and that the shift drum position is neutral as shown (switch pin groove is in positioned lengthwise)