I have a Gravley ZT1844XL Z-turn it's a 2004 model, it now has 805.9 hrs on it I would buy again if the still made them, I think they only made it 2 years it was $4200 new.
It runs just as good now as it did new, I guess Gravley figured out it was made too good for residential mower ?
Another thing it has a 18 hp Kohler courage the only thing I've done is adjust valve lash and check torque on case bolts each year when I take cover off to check for nests.
Does anyone have a single cylinder Kohler Courage that has more than 800 hours on it, mine has got to be one of the highest ?