2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 147Get this manual
FINAL DRIVE
CONCENTRIC SWINGARM REAR AXLE REMOVAL
1Securely support rear of machine with rear wheels off the floorRemove rear wheels and hubs2Remove drive chain3Remove snap ring (A), lock sleeve (B) and foam seal (C) from axle
Remove Rear Caliper
B 6Support rear caliper with wire or tie strapDo not hang caliper by brake line