Page 265 - Manual Oficina Polaris RZR XP 1000 17-18

PVT SYSTEM

DRIVEN CLUTCH OPERATION PVT BREAK-IN (DRIVE BELT / CLUTCHES)
Driven clutches primarily sense torque, opening and A proper break-in of the clutches and drive belt will
closing according to the forces applied to it from the drive ensure a longer life and better performance. Break in the
belt and the transmission input shaft. If the torque clutches and drive belt by operating at slower speeds
resistance at the transmission input shaft is greater than during the 10 hours as recommended (see Chapter 3 –
the load from the drive belt, the drive belt is kept at the Engine Break-In Periodpage 3.31 for break-in example).
outer diameter of the driven clutch sheaves. Avoid aggressive acceleration and high speed operation
during the break-in period. After installation of a new
As engine RPM and horsepower increase, the load from
the drive belt increases, resulting in the belt rotating up drive belt, break-in new drive belts by operating at slower
toward the outer diameter of the drive clutch sheaves speeds during the break-in period ~50 miles. Carry only
and downward into the sheaves of the driven clutch. This light loads. Avoid aggressive acceleration, high speed
action, which increases the driven clutch speed, is called operation, and extended time at a specific RPM during
upshifting. the break-in period. In addition, when operating in sand/
dune environments, avoid extended low speed operation
Should the throttle setting remain the same and the at high throttle.
vehicle is subjected to a heavier load, the drive belt
rotates back up toward the outer diameter of the driven MAINTENANCE / INSPECTION
clutch and downward into the sheaves of the drive clutch.
This action, which decreases the driven clutch speed, is Under normal use the PVT system will provide years of
called backshifting. trouble free operation. Periodic inspection and
maintenance is required to keep the system operating at 5
In situations where loads vary (such as uphill and peak performance. The following list of items should be
downhill) and throttle settings are constant, the drive and inspected and maintained to ensure maximum
driven clutches are continually shifting to maintain performance and service life of PVT components. Refer
optimum engine RPM. At full throttle a perfectly matched to the troubleshooting checklist at the end of this chapter
PVT system should hold engine RPM at the peak of the for more information.
power curve. This RPM should be maintained during
clutch upshift and backshift. In this respect, the PVT 1. Belt Inspection.
system is similar to a power governor. Rather than vary 2. Drive and Driven Clutch Buttons and Bushings,
throttle position, as a conventional governor does, the Drive Clutch Shift Weights and Pins, Drive Clutch
PVT system changes engine load requirements by either Spider Rollers and Roller Pins, Drive and Driven
upshifting or backshifting.
Clutch Springs.
3. Sheave Faces. Clean and inspect for wear.
4. PVT System Sealing. Refer to the appropriate
illustration (s) on the following pages. The PVT
system is air cooled by fins on the drive and driven
clutch stationary sheaves. The fins create a low
pressure area in the crankcase casting, drawing air
into the system through an intake duct. The opening
for this intake duct is located at a high point on the
vehicle (location varies by model). The intake duct
draws fresh air through a vented cover. All
connecting air ducts (as well as the inner and outer
covers) must be properly sealed to ensure clean air
is being used for cooling the PVT system and also to
prevent water and other contaminants from entering
the PVT area. This is especially critical on units
subjected to frequent water forging.

9928492 R06 - 2017-2018 RZR XP 1000 / XP4 1000 Service Manual 5.5
© Copyright Polaris Industries Inc.