2010-2012 PRO-RIDE RUSH Switchback RMK Service Manual, Page 330Get this manual
Steering and Suspensions PROGRESSIVE REAR SUSPENSION REMOVAL AND INSTALLATION
Removal
1Place large mat, shop blanket, or piece of cardboard on the floor next to the snowmobileThe piece should be large enough to protect the plastics when the unit is laid on its side2Remove the rear bumper assembly from the rear crank6Remove the upper carrier wheel assembly from the rear crank
UPPER CARRIER
7Remove the two fasteners and nuts securing the rear pivot to the rear crank
BUMPER FASTENERS