3
9928485 R01 - 2017-2018 RANGER 500 / 570 Service Manual
© Copyright Polaris Industries Inc.
3.97
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
q
for broken or damaged teeth.
4. Inspect bearing surfaces
w
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.
CRANKSHAFT REMOVAL
1. Remove the engine from the engine stand and place
the assembly on a sturdy work bench.
ENGINE / COOLING SYSTEM
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