Pvt System Overview; General Operation; Pvt Break-In (Drive Belt / Clutches); Drive Clutch Operation - Polaris RZR 900 2017 Service Manual

PVT SYSTEM

PVT SYSTEM OVERVIEW

GENERAL OPERATION

All PVT maintenance or repairs should be performed by
a certified Polaris Master Service Dealer (MSD)
technician who has received the proper training and
understands the procedures outlined in this manual.
Because of the critical nature and precision
balance incorporated into the PVT components, it is
absolutely essential that no disassembly or repair
be made without factory authorized special tools
and service procedures.
The Polaris Variable Transmission (PVT) consists of
three major assemblies:
1) The Drive Clutch
2) The Driven Clutch
3) The Drive Belt
The internal components of the drive clutch and driven
clutch control engagement (initial vehicle movement),
clutch upshift and backshift. During the development of
the Polaris vehicle, the PVT system is matched first to the
engine power curve; then to average riding conditions
and the vehicle's intended usage. Therefore,
modifications or variations of components at random are
never recommended. Proper clutch setup and careful
inspection of existing components must be the primary
objective when troubleshooting and tuning.
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 page 3.31 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.
6.4
WARNING

DRIVE CLUTCH OPERATION

Drive clutches primarily sense engine RPM. The two
major components which control its shifting function are
the shift weights and the coil spring. Whenever engine
RPM is increased, centrifugal force is created, causing
the shift weights to push against rollers on the moveable
sheave, which is held open by coil spring preload. When
this force becomes higher than the preload in the spring,
the outer sheave moves inward and contacts the drive
belt. This motion pinches the drive belt between the
spinning sheaves and causes it to rotate, which in turn
rotates the driven clutch.
At lower RPM, the drive belt rotates low in the drive
clutch sheaves. As engine RPM increases, centrifugal
force causes the drive belt to be forced upward on drive
clutch sheaves.
9930588 R02 - 2017-2020 RZR 900 900/S 900/S4 1000/S 1000/S4 Service Manual
© Copyright Polaris Industries Inc.