Chaincase Cover Service; Chaincase Assembly - Polaris 850 PRO-RMK 155 2020 Manual

FINAL DRIVE / BRAKE SYSTEMS

CHAINCASE COVER SERVICE

If oil leaks are found at the jackshaft bearing location on
the chaincase, the seal and bearing should be inspected
and serviced accordingly.
1. With the chaincase cover removed and placed on a
workbench, use a pick to pry the oil seal
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chaincase cover .
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2. Press the bearing out using an Arbor press or
similar tool. Always press on the bearing's outer race
during removal and installation.
3. Inspect the bearing by feel. Replace if bearing feels
rough or freewheels.
4. Install a new bearing into the cover using an Arbor
press or similar tool. Press only on the bearing's outer
race.
5. Install a new oil seal into the front of the cover. Apply
a light film of oil to the seal lips to aid installation.
Press only on the outer circumference of the seal.
Note that the oil seal spring lip faces in. Press seal
into bore until flush with the outer edge of the
chaincase.
6.16

CHAINCASE ASSEMBLY

1. Thoroughly clean the chaincase, sprockets, and
chain.
2. Inspect the tensioner pad for damage. Replace if
excessive wear is evident.
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out of the
3. Install the upper / lower sprockets and chain as an
assembly.
4. Install the lower sprocket bolt and beveled washer.
Verify the beveled washer is installed dome-side out.
Torque bolt to specification.
5. Install the chain tensioner, seal, jam nut and adjuster
bolt. Rotate the jackshaft (driven clutch) counter-
clockwise (forward) to move all of the chain slack to
the tensioner side of the chaincase.
6. Tighten the tensioner adjuster bolt until there is 1/8
inch (3.175 mm) chain deflection on the backside of
the drive chain.
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
TORQUE
Lower Sprocket Bolt:
29 ft-lbs (40 Nm)
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