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95
MAINTENANCE
PVT System
The basic operation of the Polaris PVT system is dependent on engine
speed and vehicle torque requirements. As engine speed increases, the
force exerted on the movable drive sheave by the flyweights also
increases. This, in turn, i ncreases the amount of pinch appliedtothe
drive belt. Similarly, if the engine speed decreases, the amount of
centrifugal force decreases, reducing the amount of belt pinch.
On Polaris ATVs, the approximate gear ratio difference between high
and low range is 1:2.25. This difference in gearing affects the operation
of the PVT, especially at speeds less than 7 MPH (11 KPH), due to the
system’s dependence on engine speed.
For example, when operating at a ground speed of 3 MPH (5 KPH) in
low range, the engine speed would be around 3000 RPM. This is well
above the engagement speed of 1200 - 1400 R PM. However, in high
range at 3 MPH (5 KPH), the engine would be running at only 1500
RPM. Whenever operating this close to the engagement speed, the
engine may be running at a speed too low to provide the pinch needed
to prevent belt slip. Belt slip is responsible for creating the excessive
heat that destroys belts and causes outer clutch covers to fail.
By switching to low range while operating at l ow ground speeds, the
air temperature in the clutch cover i s reduced by almost 160 degrees.
Reducing t he temperature inside t he clutch cover extends the life of the
PVT components (belt, cover, etc.).
When To Use Low Range and High Range
Condition Range to Use
Operating at speeds less than 7 MPH (11 km/h) Low
Towing heavy loads Low
Operating in rough terrain (swamps, mountains, etc.) Low
Operating at speeds greater than 7 MPH (11 km/h) High
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