2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 160Get this manual
TRANSMISSION
TROUBLESHOOTING CHECKLIST
Check the following items when shifting difficulty is encounteredS Idle speed adjustment Transmission oil typequality Transmission torque stop adjustment Drive belt deflection Loose fasteners on rod ends Loose fasteners on shifter Worn rod ends, clevis pins, or pivot arm bushings
Linkage rod adjustment and rod end positioning Worn, broken or damaged internal transmission components NOTE: To determine if shifting difficulty or problem is caused by an internal transmission problem, isolate the transmission by disconnecting linkage rods from transmission bellcranksManually select each gear range at the transmission bellcrank, and test ride vehicleIf it functions properly, the problem is outside the transmissionIf transmission problem remains, disassemble transmission and inspect all gear dogs for wear (rounding), damageInspect all bearings for wear