I have a new m5140 and tried yesterday to hook up my old rotary cutter and the pto shaft wouldn't slide on all the way, seemed like the tractor pto output was a little to big, it would start but get tight before it was snapped in. I saw a post of yours with a similar problem. Have you been able to connect yours to any other pto implements without forcing the shaft on and off? Also my tractor has a intemitent thumping noise in the hydraulic steering line, been doing it since day 1, kubota says to ignore it. Have you noticed a noise in your tractor?