2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 295Get this manual
14Using 52 mm deep-well socket and suitable holding tool, remove the crankshaft balancer drive gear nut (1) from the crankshaft; then remove the drive gear (2)Account for washer (3) and drive pin (4)
Installing Left-Side Components
1Install the oil pump securing it to the crankcase with three Phillips-head cap screws (threads coated with red Loctite #271)Tighten securely