I'm not sure you have a blown seal. If you did I think there would be more extra oil in the pan than one quart. Also, it may be that only the mounting gasket is leaking.
I just put a ratchet on the mounting bolts, one was quite loose and matched where the oil was dripping from. Sounds like you are right. I topped off the hydraulic fluid with about a quart and a half. Maybe I'm getting off easy and just have a gasket to repair.
Highlights the need to go over these machines regularly, and check for loose or missing bolts and nuts. Just might save you from a major, expensive breakdown.
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