What horse power engine are you talking?What kind of terrian?I have a 2007 Kubota 326 pro ZTR 26hp diesel with a 60 inch deck that does fine job.Kubota makes a 331 diesel with a 72 inch deck and a model F3680 36hp diesel with a 72 inch deck.If I was mowing 40 acres I would buy the biggest tractor I could afford with a large finish mower or rotary cutter.coobieJWB53 said:could grasshopper diesel 6 foot deck handle 1-2 foot grass & weeds, at a reasonable pace, i have over 40 acres thanks i'm concerned about time to cut and over heating