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90
PVT SYSTEM OPERATION
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, due
to the system’s dependence on engine speed.
For example, when operating at a ground speed of 3 MPH in low
range, the engine speed would b e around 3000 RPM. This is well
above the engagement speed of 1200 - 1400 RPM. However, in
high range at 3 MPH, 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 which is too low to provide
adequate “pinch” needed to prevent belt slip. This belt slip is re-
sponsible for creating the excessive heat that destroys belts and
causes outer clutch covers to fail.
By switching to low range while operating at low ground speeds,
the air temperature in the clutch cover is reduced by almost 160
degrees. Reducing the temperature inside the clutch cover ex-
tends the life of the PVT components (belt, cover, etc.).
NOTE; Modelswithouta lowrange shouldavoidheavy pullin g
and extended low-speed operation.
PVT Drying
There may be some instances when water is accidently ingested
into the PVT system. Use the following instructions to dry it out b e-
fore operating:
Shift the transmission into neutral and apply full throttle for no
longer than 10 seconds and repeat as necessary. This will expel
the moisture and air-dry the belt and clutches. Allow the engine
RPM to settle to idle speed and shift the transmission to the lowest
available range and test for belt slippage. If the belt slips, repeat
the process.
Take the vehicle to your dealer for service as soon as possible.
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