Polaris 850 PRO-RMK 155 2.6" QD 2021, Manual

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7
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
7.3
GENERAL INFORMATION
SPECIAL TOOLS - PVT SYSTEM
TOOL PART NUMBER
Drive Clutch Puller 2872085
Replacement Handle for
ALL Clutch Pullers
5020326
Drive Clutch Holding
Wrench
9314177-A
Drive Clutch Spider Nut
Socket
2870338
Drive Clutch Spider
Removal/Installation Tool
2870341
Clutch Pin Punch 2870507
Tapered Reamer - 33 mm
PU-52497
Clutch Alignment Tool
PS-51607
Roller Pin Installation
Roller/Bushing Alignment
Tool
2870910-A
Drive Clutch Button
Removal Tool
2870985
Clutch Bushing
Replacement Tool Kit
2871025
Clutch Holding Fixture
2871358-1
Universal Drive/Driven
Clutch Compressor
(Screw Down Type)
PU-50518
Spring-Loaded Roller Pin
Installation Roller/Bushing
Alignment Tool
8700221
Drive Clutch Compression
Tool (Compresses drive
clutch without removing
clutch from engine.)
2871173
Bosch Automotive Service Solutions 1-800-345-2233
or https://polaris.service-solutions.com
DRIVE SPRING
The drive spring opposes the shift force generated by the
clutch weights, and determines the neutral RPM,
engagement RPM, and whether the engine RPM
remains flat, rises, or falls during shift out. When
changing only the drive spring, installing a spring with a
lower pre-load rate will result in a lower engagement
RPM speed, while installing a spring with a higher pre-
load rate will result in a higher engagement RPM.
CLUTCH WEIGHT
The clutch weights generate centrifugal force as the drive
clutch rotates. The force generated changes in relation to
the engine RPM and with the specified weight of each
clutch weight. When changing only the clutch weights, a
lighter weight will result in a higher engagement RPM,
lower shifting force, and higher shift out RPM. Installing
heavier weights has the opposite effect
NEUTRAL SPEED
A specific engine RPM speed when the force generated
by the clutch weights is less than the pre-load force
generated by the drive spring. In this mode, the drive
clutch is disengaged.
ENGAGEMENT RPM
Engine engagement RPM occurs when the force
generated by the clutch weights overcomes the drive
spring pre-load force and the moveable sheave begins to
close or “pinch” the drive belt. The engagement mode
continues until no more belt slippage occurs in the drive
clutch. Once 100% belt engagement is achieved, the
sled will accelerate along the low ratio line until the drive
clutch up shift force overcomes the opposing shift force
generated by the driven clutch.
SHIFT OUT OVER-REV
An engine RPM that spikes above the desired operating
RPM speed. The shift out RPM should come down to the
desired operating RPM, but never below, after the driven
clutch begins to open.
PVT SYSTEM