Grandad4 all the fields have been plowed and disked every year for the last 5 years, so I would not be break new ground. I was thinking of the L3200 but looking at the specs its shorter wheel base and the gpm for the hydraulics are lower by quite abite.
That does make a difference, but you still need to travel very slowly. There are many threads here discussing why HST is better than gear drive for a rotary tiller simply because the lowest, slowest gear on most tractors is simply too fast for the tiller to work effectively. We've been using a 6 ft tiller for the last 7 or 8 years and that would be our experience also. Here's a little table that shows the time in hours it takes to make one pass over various acres at different speeds with a 5 ft implement (not counting additional time for turns, and no overlap):
Speed (mph)
0.50 0.75 1.00 1.25 1.50
Acres
1 3.0 2.0 1.5 1.2 1.0
2 6.1 4.0 3.0 2.4 2.0
3 9.1 6.1 4.5 3.6 3.0
4 12.1 8.1 6.1 4.8 4.0
5 15.2 10.1 7.6 6.1 5.1
6 18.2 12.1 9.1 7.3 6.1
7 21.2 14.1 10.6 8.5 7.1
8 24.2 16.2 12.1 9.7 8.1
9 27.3 18.2 13.6 10.9 9.1
10 30.3 20.2 15.2 12.1 10.1
(Well, sorry, the spacing looks fine in the editing box but gets all messed up when it's posted)
I typically make 2 passes, and figure I'm only going .5 or .75 mph... way less than "walking speed" at least. Don't know about you, but running a tiller for 20 or 30 hours isn't my idea of fun, so I just wanted to pass along a friendly "heads up" for you to do your own figuring for this.