I can't say who built the unit but it's a really nice set-up you've got there. If you're having issues it really won't matter who's unit it is. A good hydraulic repair shop can rebuild or replace seals etc. regardless.
We use... Mac's Hydraulic Jack & Equipment Service Inc Street: 121 Putnam Street Pittsburgh, pa 15206-4135 Phone: (412) 361-1555
They are very reasonable and can make up seals or rings and stock material for rods if they're too rough.
Only thing I might consider doing different with that rig is to put a non-fluid transfering support between the two cylinders up at the rod end and then put a fitting and a hose between the two for equalizing the rod end feed. That way there'd be some give on the fluid line and less chance of cracking?
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