Open the chaincase and remove the driveshaft gear. Remove the plates that hold the bearing in the tunnel. Loosen the allen head set screw on the bearing locking collar. Turn the locking collar toward the rear of the machine. Remove bearing and collar. No puller is needed. Heat and a hammer may be needed. Since you have to open the chaincase, anyway, removing the track is the least of your worries. You do not have to physically remove the track, but you may or may not have to remove the driveshaft to get the bearing off.
Now I am uncertain of how similar your Polaris would be to an AC when it comes to this, but check this site out, it may help you with your bearing question. Which side do you need to replace?
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