I'm curious too!
Are you planning on joining Mike H. with his depth stick and follow along with your radar gun?
Most Cubs run 0 to 8 MPH. and unless your John L. or Travis S, I would think that around 3 or 4 MPH would be about average depending on the soil. And with a tiller, that depends on the soil too, I've seen snails pass me in the hard stuff.
Well said, "As fast as you can pull it <u>and still do a good job".</u>
Not that I'm the best plowin' guy in the field, but how many of us seen a guy going b---s out, crooked as a dogs hind leg, or just scratching the ground. Straight and steady is the way to go! <font size="-2">(OK, I've been guilty a time or two, but some time you got to climb a <font color="119911">Deer John's </font><font color="000000">transmission.)</font></font>
(Of course, I just HAD to ride Doug E's @$$, he was running Chris E's 1450,........pull out of the furrow...pass him...drop back in the furrow in front of him, and proceed to chase down Chris E. and his 782 with my 169 at Travis's last fall..........I told him that fresh 16hp had some grunt, but showing him was more fun!!!!
There was one gear drive going over 6 mph at Travis's. He came flying up behind me and my 1650. He made me push the hydro lever as far as she would go and put just a little distance between us. Is your 148 going to be able to accomplish the same task? Nice thing about a hydro, find the speed you feel comfortable with or as fast as you have the power for. Needless to say, I could not go that fast last fall in that good Illinois black dirt.
The 148 won't do that unless the ground is light enough to pull it in stock 3rd. It will have (as soon as I get it swapped in) an internal brake trans. with a 19T 2nd good for right at 4 mph. My 100 also has a 19T 2nd and in hard ground the 12hp won't quite cut it (it was overhauled in '85, so it might not be quite 100%, but it is still strong). The 148 will have a freshly overhauled 14hp in it, rapped out to a good strong 3800 rpm's or so.......there shouldn't be much stopping it, provided I don't twist of an axle or top shaft.
FWIW the tractor I'm building won't likely do 6mph, but it'll have useable gears for a nice range of speeds. 4000RPM engine, turning a 23% OD input set, 19T third gear, 16T second gear, and the 13T first (so I can use reverse without having to go to a 4-speed fork set and custom shift rods). I hope it's as good of a setup as it looks on paper. One thing of note, to get that 19T to the third gear position, a LOT of iron needs to be ground from the front of the case, enough so that you end up breaking into the back of the lower bolt holes that hold on the reduction housing, so some good RTV needs to be used to seal up those holes/threads.
As far as the 6mph on a hydro goes, I'm willing to bet that the relief valves are bleeding off enough that true full ground speed isn't attained, I can run "full hydro" with my 169, but when my plow used to plug up (doesn't anymore!!!) I'd still get a surge of speed.
I have a question.... I bought a 682 hydro 1982 I love it and I got it for a steal but..... I want to add hydro lifts to it How many can I add using the ports from the rearend? Can this be done? I wanted to put lines up front for angled blade power. So basically two cylinders will be used at once.