2010 Polaris Sportsman 850 Service Manual, Page 258Get this manual
FINAL DRIVE 11Support the gearcase cover and carefully press in the new cover bearing (see Figure 8-28)Support the ring gear and carefully press on the new main gearcase bearing12Install the seals into the case halves using standard seal installer or other suitable methodSeal depth should be approximately .110 in(2.79 mm) from the main surface
Gearcase Assembly
123Grease all seals with Polaris All Season Grease (PN 2871322) upon assembly to prevent from damaging sealsInstall the ring gear into the main gearcaseInstall the shim previously removed onto the ring gear
13Install the pinion shaft and new retaining ringInstall the retaining ring with the straight edge facing the bearing