2008 Arctic Cat ThunderCat ATV Service Manual, Page 68Get this manual
2Inspect the crankcase for securing, discoloration, or cracks in the gerotor boreIf scored, crankcase assembly must be replaced GZ354A
6Remove the oil seal from the oil pump coverGZ357
3Inspect the gerotor set for scoring, discoloration, or cracks; then using feeler gauge, check the inner to outer rotor clearanceIf measurements exceed specifications, the gerotor set must be replaced
Assembling 1Install new oil seal into the oil pump cover; then coat the lips of the seal with grease and install the pump driveshaft from the seal sideGZ355