2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 93Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 93

ENGINE One Way Valve The one way valve prevents oil from draining out of the oil tank and into the crankcase when the engine
lightly on the pump shaft if necessary4Remove the Mag (RH) crankcase from the PTO case Oil Pump RemovalInspection 2Inspect
free length of spring and check coils for distortionOne Way Valve Spring Free Length: Std: 1.450" (3.68 cm) 3Inspect valve
for wear4Check seat area for nicks or foreign material that may prevent proper sealing of valve1Remove pump shaft bearing
(A) and thrust washer (B) from pump shaft Crankcase Separation 1Remove flange bolts (10) from magneto side crankcase evenly
in criss-cross pattern 2Remove (2) bolts holding pump drive gear (C)3Inspect drive gear teeth for cracks, damage or excessive