Polaris Ranger 6x6 700 EFI 2009 Owner's Manual page 81

MAINTENANCE
Polaris Variable Transmission (PVT) System
Belt slip is responsible for creating excessive heat that destroys belts,
wears clutch components and causes outer clutch covers to fail. Switch
to low range while operating at slower speeds to extend the life of the
PVT components (belt, cover, etc.).
When To Use Low Range and High Range
Operating at speeds less than 7 MPH (11 km/h)
Towing heavy loads
Operating in rough terrain (swamps, mountains, etc.)
Operating at speeds greater than 7 MPH (11 km/h)
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Condition Range to Use
Low
Low
Low
High