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9924871 R03 - 2014 Polaris Sportsman® 570 EFI Service Manual
© Copyright 2013 Polaris Sales Inc.
Balance Shaft Removal / Inspection
1.
Rotate crankshaft to align the timing marks as shown
below.
2.
Pull upward on the balance shaft and remove it from
the crankcase.
3.
Inspect drive gear for broken or damaged teeth.
4.
Inspect bearing surfaces for scoring or signs of wear.
5.
Inspect / replace the balance shaft bearings in both
crankcase
halves.
See
“Crankcase
Bearing
Inspection / Removal” procedure in this chapter.
NOTE: Due to extremely close tolerances and
minimal wear, counterbalance shaft ball bearings
must be inspected visually and by feel. Look for
signs of discoloration, scoring or galling. Turn
the inner race of each bearing. The bearings
should turn smoothly and quietly. The outer race
of
each
bearing
should
fit
tightly
in
the
crankcase bore. The inner race should be firm
with minimal side to side movement and no
detectable up and down (radial) movement.
ENGINE
