2004 Arctic Cat ATVs factory service and repair manual, Page 134Get this manual
I NOTE: For general servicing, it is advisable to disassemble, clean, and inspect the oil pumpIf any wear or damage is suspected, replace the oil pump 14Remove the circlip securing the oil pump driven gear; then remove the gearAccount for the pin and the washerI NOTE: Always use new circlip when installing the oil pump driven gear
12Release the tension from the gear shift cam stopper arm spring
13Remove the cap screw securing the gear shift cam plate and guide to the gear shift cam; then remove the cam plate and guideAccount for the guide and five pins