Oil Pump Assembly; Counter Balancer Shaft Removal / Inspection - Polaris A12MH46AX Service Manual

ENGINE

Oil Pump Assembly

1. Clean and dry all parts thoroughly.
engine oil to all parts. Do not use gasket sealer on
the pump body mating surfaces or oil passages will
become plugged.
2. Install pump shaft and scavenge rotor drive pin.
3. Install outer scavenge rotor, inner scavenge rotor, and
scavenge casing.
4. Install outer feed rotor and inner feed rotor drive pin.
5. Install inner feed rotor and feed chamber cover with
screw.
6. Tighten screw securely.
7. Install screen on pump body.
8. Install oil pump on crankcase and torque bolts to 6 ft.
lbs. (8 Nm).
Oil Pump Attaching Bolt Torque:
6 ft. lbs. (8 Nm)

Counter Balancer Shaft Removal / Inspection

1. Remove the shim washer (A) from the counter
balancer shaft.
3.40
Apply clean
A
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
2. Note the alignment dots on the balancer and
crankshaft gears, the marks must be aligned during
reassembly.
3. Turn the shaft until balancer counter weights clear the
crankshaft and remove the balancer shaft from the
crankcase.
4. Inspect the balancer drive gear and pump shaft drive
gear.
5. Replace the shaft if gear teeth are abnormally worn
or damaged.
6. Inspect the balancer shaft bearings.
NOTE: Due to extremely close tolerances and
minimal wear, the balancer 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. The inner race should be
firm with minimal side to side movement and no
detectable up and down movement.