2007-2009 Honda TRX300EX TRX300X service manual, Page 75Get this manual
LUBRICATION SYSTEM Insert the driven gear shaft into the pump cover and install the dowe pin Align the flats on the inner rotor and gear shaft, then install the cover on the body with the dowel pins in the hole
HOLE Install the washer and snap ring ali gning the flats of he washer and shaftBe sure there are no clearance at the mating surfaces and tighten the screws securelyCheck that the oil pump rotates smoothlyWASHER AND SNAP RING Al ning