Bearing Installation; End Play Inspection / Adjustment; Crankshaft End Play Adjustment - Polaris A12MH46AX Service Manual

Bearing Installation

NOTE: To ease bearing installation, warm the
crankcase until hot to the touch. Place the bearings
in a freezer.
1. Install the bearings so the numbers are visible.
2. Drive or press new bearings into the crankcases,
using the proper driver. CAUTION: Press only on
outer race of bearing to prevent bearing damage.
• 70 mm (2.755") driver- for crankshaft main
bearings.
• 46 mm (1.810") for counter balancer bearings.
• 28 mm (1.100") for pump shaft bearing.

End Play Inspection / Adjustment

Before reassembling the crankcase the following steps
should be performed to determine the amount of
crankshaft, counter balancer shaft, and pump shaft end
play: Excessive end play may cause engine noise at idle
and slow speeds. Too little play will side load the bearings
which may lead to premature bearing failure.
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.

Crankshaft End Play Adjustment

1. Make sure all bearings are firmly seated in both the
Mag and PTO crankcase.
2. Measure the distance from the PTO crankcase mating
surface to the main bearing using a dial caliper and a
straight edge.
3. Subtract the thickness of the straightedge from the
measurement obtained in Step 2 and record.
PTO Case Depth______________________
ENGINE
3
3.43