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9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
PVT SYSTEM DIAGNOSTICS
DRIVE BELT
• Verify the specified drive belt is installed on the
vehicle.
• Drive belts have different width, angle, and length
measurements. Reference the “Drive Belts” section for
specifications.
• Installing a non-specified drive belt often requires drive
clutch spacer adjustments to achieve the correct belt-
to-sheave clearance.
• Install the drive belt so the part number can be read
from the left-side of the vehicle. Always install the belt
using the same orientation as it was before removal.
• PREMATURE WEAR: Ensure the correct belt is
installed. Inspect belt-to-sheave clearance, deflection,
and clutch alignment.
• Adjust the gearing for rider type. Verify the correct
clutch weight / spring package is installed.
• Change riding habits / style.
• OPERATING RPM DROP: Drive belts used on
snowmobiles operated at high speeds / loads
(mountain use) for extended periods of time should be
inspected for glazing at 1,000 mile intervals. Replace
as required.
• CORD POP-OUT: Inspect drive / driven clutch
alignment, motor mounts, and deflection. Set the
driven clutch float.
• Remove the belt during off-season storage period.
DRIVE CLUTCH
• PREMATURE WEAR:
• Verify the correct clutch weight / spring package is
installed.
• Inspect the spider rollers / bushings for damage and
uneven wear.
• Inspect sheave faces for premature wear. De-glaze
faces with 1500-2000 grit sand paper.
• Verify the jam nut / spider are torqued to specification.
• OPERATING RPM DROP:
• Replace the drive clutch spring and retest.
• Inspect the spider rollers / bushings.
• Inspect / adjust belt-to-sheave clearance.
• Inspect the moveable / cover bushings.
DRIVEN CLUTCH
• PREMATURE WEAR:
• Verify the correct clutch helix / spring is installed.
• Inspect the rollers / bushings for damage and uneven
wear.
• Inspect sheave faces for premature wear. De-glaze
faces with 1500-2000 grit sand paper.
• Verify the driven clutch floats on the jackshaft.
• OPERATING RPM DROP:
• Replace the spring and retest.
• Inspect the spider rollers / bushings.
• Inspect the moveable / cover bushings.
GENERAL INFORMATION
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