2010 Polaris Sportsman 850 Service Manual, Page 228Get this manual
FINAL DRIVE 12Remove the vent line and the (4) bolts securing the front gearcase to frame
Gearcase DisassemblyInspection
12Drain and properly dispose of used lubricantRemove any metal particles from the drain plug magnetRemove the (4) screws retaining the piston pump assembly to the gearcase and remove the pump