2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 327Get this manual
TRANSMISSION 8Install the rear drive differential and drive chain, following these precautions: The case half rear output seal should be removed prior to installation of the differential, as seal damage can occur with seal installed due to the angle of entry Install the differential sliding geardog onto the shift fork arms at the same time the silent chain is installed The differential gear bearing may be lightly tapped into placeThe output seal can be installed once the assembly is in placeTop View Tensioner Cam Insert the front pin through the tensioner cam and the rear pin through the tensioner shoeSpring Leg
Forward
Place the spring over the front pin and hook the spring leg under the camView From Left Side of Transmission Forward