I just bought a new Honda HRX217HYA and was breaking the engine in with blades engaged. After 15 minutes hydrostatic oil was coming out of the transmission. Did i cause it to over heat by by doing this or is it an isolated problem. I am taking it back to the dealer tomorrow.
I have an old Honda 215 Masters mower with hydro trans, so it may have a different trans than yours, but the trans has a filler cap/dipstick that does come loose from time to time. I'd check to see if it does have a filler cap and if it's loose. Might save you the hassle of returning the mower.