2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 151Get this manual
FINAL DRIVE
CONCENTRIC SWINGARM REAR HOUSING REMOVAL
1Remove rear axle(See Page 7.6) 2Remove sprocket hubNote sealing O-ring between sprocket hub and bearing
5Remove the rear housing from the swingarm
REAR HOUSING DISASSEMBLYBEARING SERVICE
3Remove brake caliper mounting bracket from the rear housingUpper Mounting Bracket 1Remove seals from housing
Bearing
Seal Brake Disc Guard Lower Mount Bracket Rear Housing Mount Bolts 4Remove brake caliper mount bushing from the upper mounting bracketNOTE: Flange inward as shown2Remove bearings3Drive bearing race out from opposite sides4Inspect housing for cracks or wearReplace if damaged