Couldn't remove the blade one year. Instead, Put the front edge of mower up on a cinder block. Grind blade with Dremel tool and stone wheel.
Did this for years. Bought a new house which required lawn tractor. Same technique....just requires old bumper jack. Again, I really did try removing the blades first, just couldn't get enough access to generate enough torque.
Originally posted by Fredward: I just bought a small hand pump to reduce the need for tipping the mower. Ten bucks saved a lot of hassle, and no more spills! Amazon also had 5 air filters for 10 bucks for the mower.
^^This. A oil pump is great for this. Note this is best done with a hot engine unless you're looking for an arm workout.