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How big is the deck? If it's only like 38" or maybe 42" and you take it slow and don't try to cut very tall grass it might work.
My point of reference is the old 21" walk behind mowers from the '60s that had 3.5 hp engines. Heavy grass over a broken septic line would bog them down terribly, but a normal weekly cutting was no problem. Add the extra horsepower necessary to move a 500 lb tractor and operator and 7 hp is (barely) enough for a 38" deck. For a 42" deck, 10 hp is more realistic for a gear drive and 12 hp for a hydro drive.
 
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