2010 Polaris Sportsman 850 Service Manual, Page 179Get this manual

2010 Polaris Sportsman 850 Service Manual, Page 179

CLUTCHING (PVT) Shift Weights Shift weights have many factors designed into them for controlling engagement RPM and shifting
illustrations on the following pagesThe PVT system is air cooled by fins on the drive clutch stationary sheaveThe fins create
low pressure area in the crankcase casting, drawing air into the system through an intake ductThe opening for this intake
duct is located at high point on the vehicle (location varies by model)The intake duct draws fresh air through vented coverAll
connecting air ducts (as well as the PVT cover) must be properly sealed to ensure clean air is being used for cooling the
PVT system and also to prevent water and other contaminants from entering the PVT areaThis is especially critical on units
subjected to frequent water forging Driven Clutch Operation Driven clutches primarily sense torque, opening and closing according
to the forces applied to it from the drive belt and the transmission input shaftIf the torque resistance at the transmission
input shaft is greater than the load from the drive belt, the drive belt is kept at the outer diameter of the driven clutch