2010 Polaris Sportsman 850 Service Manual, Page 180Get this manual
CLUTCHING (PVT) OverheatingDiagnosis
During routine maintenance, or whenever PVT system overheating is evident, it's important to check the inlet and outlet ducting for obstructionsObstructions to air flow through the ducts will significantly increase PVT system operating temperaturesThe vehicle should be operated in Low when plowing or pulling heavy loads, or if extended low speed operation is anticipatedCLUTCH DRIVE BELTCOVER RELATED ISSUES: DIAGNOSIS Possible Causes Loading the vehicle into truck or tall trailer when in high rangeSolutionsWhat to do Shift transmission to Low during loading of the vehicle to prevent belt burning