3
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
3.79
Installation
NOTICE
To ease bearing installation, warm the crankcase
evenly with a heat gun or place in an oven and heat to
220-250° F. Place bearings in clean plastic wrap and
set in a freezer for 10-20 minutes.
5. Clean all bearings
e
and inspect for excessive wear.
NOTICE
Apply Loctite® 641 to the inner race of each of the
crank bearings.
6. Lubricate all bearings
e
with clean engine oil.
7. Fully seat the new balance shaft bearing until
bottomed in the bearing bore.
8. Install the retaining ring
t
for the crankshaft
bearings.
9. Fully seat the new outer PTO crankshaft bearing
until bottomed against the retaining ring.
10. Install the bearing spacer
r
.
11. Press in the new inner PTO bearing until it is
bottomed against the bearing spacer.
12. Apply Loctite® 272™ to the two bearing retainer
bolts
q
.
13. Install the bearing retainer
w
and torque the fastener
to specification.
TORQUE
Bearing Retainer Fastener:
8 ft-lbs (11 Nm)Apply Loctite® 272™
MAG SIDE CRANKCASE BEARING
SERVICE
Bearing Removal
1. Support the crankcase and drive, press, or extract
the balance shaft bearing
q
with a blind bearing
remover.
NOTICE
The MAG side crankshaft plain bearing
w
is not
serviceable. Crankcase replacement is required if the
bearing is damaged or has excessive wear. The
crankshaft is reusable if it meets specifications and
MAG side bearing surface is not groved, pitted,
damaged or excessively worn.
IMPORTANT
Due to extremely close tolerances and minimal wear,
the bearings must be inspected. Look for discoloration,
scoring or galling. The inner race of each bearing
should turn smoothly and quietly. The outer race of
each bearing should fit tightly in the crankcase. The
inner race should be firm with minimal side to side
movement and no detectable up and down movement.
Bearings are stressed during the removal process and
must not be re-used!
Installation
2. Clean all bearing bores and inspect for excessive
wear.
3. Lubricate all bearing bores with clean engine oil.
4. Fully seat the new balance shaft bearing until
bottomed in the bearing bore.
ENGINE / COOLING SYSTEM
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