I recently hit 50 hours and found my hydraulic filters to be nearly impossible to get off as well. Both filters tore, spilling fluid all over my chain wrench and me. I had to pull the rear tire off to get enough room to work... following a trip to town for a 3/4 drive ratchet set. Even with that big set, I still needed a 3' bar attached to get the wheel bolts off. Then I used the largest pair of channel locks I own and barely got those filters off. Hopefully you can get yours loose without pulling the tire, it was the only solution for the mess I had gotten myself into. I read Woodchuchdad's post where he needed a chain wrench, but the one I purchased wouldn't fit inbetween the filters close enough to the base of the filter to avoid crushing/tearing.
My advise, evaluate our experiences and plan for the worst, you'll either be right or pleasantly rewarded with it going great!! :thumbsup::thumbsup: