2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 33Get this manual
MAINTENANCE NOTE: Apply small amount of general purpose grease to the sealing edges of the filter before reinstallingFilter Clamp
Sediment Tube
NOTE: The sediment tube will require more frequent service if the vehicle is operated in wet conditions or at high throttle openings for extended periodsMain Filter 1Remove drain plug from end of sediment tube2Drain tube3Reinstall drain plug
Proper Filter Placement
Filter Support
RECOIL HOUSING
Drain the housing periodically to remove moistureCrankcase Drain