2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 274Get this manual
FINAL DRIVE Setting Ring Gear Backlash NON ADC
NOTE: Ring gear backlash is set at the factoryNo adjustment is required, unless the front cover is replaced or the back lash pad screw is removed1The backlash screw has locking agent that holds it into placeUse heat gun to lightly heat up the locking agent on the screw4Set the gearcase uprightRotate the input shaft at least timesThis ensures the ring gear completes one full rotation
2Using hex wrench, turn the back-lash screw out 34 turnsRe-apply Loctite 262 onto the bottom screw threads