Driven Clutch Operation; Pvt Break-In (Drive Belt / Clutches) - Polaris RZR XP 1000 Service Manual

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 shaft. If 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 sheaves.
As engine RPM and horsepower increase, the load from
the drive belt increases, resulting in the belt rotating up
toward the outer diameter of the drive clutch sheaves
and downward into the sheaves of the driven clutch. This
action, which increases the driven clutch speed, is called
upshifting.
Should the throttle setting remain the same and the
vehicle is subjected to a heavier load, the drive belt
rotates back up toward the outer diameter of the driven
clutch and downward into the sheaves of the drive clutch.
This action, which decreases the driven clutch speed, is
called backshifting.
In situations where loads vary (such as uphill and
downhill) and throttle settings are constant, the drive and
driven clutches are continually shifting to maintain
optimum engine RPM. At full throttle a perfectly matched
PVT system should hold engine RPM at the peak of the
power curve. This RPM should be maintained during
clutch upshift and backshift. In this respect, the PVT
system is similar to a power governor. Rather than vary
throttle position, as a conventional governor does, the
PVT system changes engine load requirements by either
upshifting or backshifting.
9925724 R01 - 2014-2015 RZR XP 1000 / RZR XP4 1000 Service Manual

PVT Break-In (Drive Belt / Clutches)

A proper break-in of the clutches and drive belt will
ensure a longer life and better performance. Break in the
clutches and drive belt by operating at slower speeds
during the 10 hours as recommended (see Chapter 3 –
Engine Break-In Period, page 3.32 for break-in
example). Avoid aggressive acceleration and high speed
operation during the break-in period. After installation of
a new drive belt, break-in new drive belts by operating at
slower speeds during the break-in period ~50 miles.
Carry only light loads. Avoid aggressive acceleration,
high speed operation, and extended time at a specific
RPM during the break-in period. In addition, when
operating in sand/dune environments, avoid extended
low speed operation at high throttle.
© Copyright 2014 Polaris Industries Inc.
PVT SYSTEM
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