Shift Weights; Maintenance / Inspection - Polaris Sportsman XP 1000 S 2020 Service Manual

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.

SHIFT WEIGHTS

Shift weights have many factors designed into them for
controlling engagement RPM and shifting patterns. Shift
weights should not be changed or altered without first
having a thorough understanding of their positioning and
the effects they may have on belt to sheave clearance,
clutch balance and shifting pattern.

MAINTENANCE / INSPECTION

Under normal use the PVT system will provide years of
trouble free operation. Periodic inspection and
maintenance is required to keep the system operating at
peak performance. The following list of items should be
inspected and maintained to ensure maximum
performance and service life of PVT components.
• Belt Inspection
• Drive and Driven Clutch Buttons and Bushings
• Drive Clutch Shift Weights and Pins
• Drive Clutch Spider Rollers and Roller Pins
• Drive and Driven Clutch Springs
• Sheave Faces (clean and inspect for wear)
• PVT System Sealing.
Refer to appropriate illustrations on the following
pages. The PVT system is air cooled by fins on the
drive clutch stationary sheave. 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 PVT cover) 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
fording.
9931493 R03 - 2020-2021 Sportsman XP 1000 S Service Manual
© Copyright Polaris Inc.
PVT SYSTEM
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