2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 137Get this manual
ENGINE 2Visually inspect thrust washerRemove pin and replace washer if damaged or worn to less than 1.15 mm (.045 in1.15-1.35 mm (.045.053 in 67Lay gear assembly on press plate with split gear side UPCarefully align pin of balance shaft with slot in gearPress shaft into gear assembly until seated against washer
Lubricate and install (3) new springs (A) in new drive gearSmall holes (B) must be aligned upon assemblyPlace split gear on drive gear with tabs (B) of split gear toward springs of drive gear, and holes (C) aligned89Lay new bearing (retaining ring side down) on open press plate so both inner and outer races are supportedPress shaft assembly into bearing until seated