Henro,
Now that you know what size you need, you might look into a Fred Cain Agri-Cutter if anyone in your area sells them. They aren't the prettiest (paint and welds not perfect in appearance), but they have a reputation for being very tough. I haven't abused mine quite like you'll see in the following copy of a post by DieselJay in response to a fellow that had to repair a Fred Cain cutter, but it has stood up very well to all I have put it through.
by DieselJay, posted 8/26/02:
"Hmm...
That's the first report I've ever found of damage to a Fred Cain Agricutter. I have the 5Ft AC105 model, and have literally beat the heck out of the thing clearing/cleaning up my new property. You name it, that mower has eaten it:
-- 15ac of 6-7ft of thick horse weeds. I parked my F350 in the cuts and couldn't see it over the weeds!
-- About 1ac of willow sapplings up to about 2in in diameter. The 3 and 4in stuff I chainsaw and then drag off, but it eats a whole deck full of 1in sapplings with nothing more than a bunch of noise.
-- One 15in 5-bolt aluminum wheel, hidden in the weeds. This just about killed the tractor before I hit the clutch and turned off the PTO. Sounded like a bomb went off, too! However, when I lifted up the mower and pulled the wheel out, the wheel had clearly lost the battle and resembled more of an oval with some nasty blade cuts in it.
-- About 10 old tires, so far. Previous owner thought tires made great bank erosion control. However, mostly they wash out and get burried under weeds until the mower about chokes on one as the steel belts rip apart and get tangled. Those are fun to dig out of the spindle -- not.
-- Some pretty good banks which I hit backwards sending the mower up the grade first. The tailwheel has done a good job supporting the deck, and my only complaint is it needs to be greased often.
-- A few 12in+ diameter rocks. Most have shattered and put a few dents in the deck, but those are the only dings to speak of.
For all that, I look at the gearbox and swear it's not big enough to take that kind of abuse. Yet, my dealer has never even serviced one, not on any size mower. They're just stout, I guess. Plus, this ugly, X-braced, shoddily painted mower was $100 cheaper than Bush Hog's light duty Squealer cutter. I'll tell you one thing, my future mowers will all be Fred Cain products. The company incorporated in 1957 -- they must be doing something right even if they still don't have a website."
Best wishes on your purchase,
Terry