2005 Polaris Sportsman 400/500 Service Manual, Page 30Get this manual
MAINTENANCE To change gearcase lubricant:
TRANSMISSION LUBRICATION
The transmission lubricant level should be checked and changed in accordance with the maintenance scheduleSPORTSMAN 400500 TRANSMISSION
11 ft.lbs (15 Nm)
View Under Front of ATV Drain Plug 1Remove gearcase drain plug (A) (11 mm) located on the bottom of the gearcase and drain oil(The drain plug is accessible through the skid plate Catch and discard used oil properly2Clean and reinstall drain plug (A) using new sealing washer toque to 11 ft.lbs(15 Nm)Drain Plug Location: Left Rear Wheel Area Fill Plug