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Post by Laapa on Dec 13, 2001 16:26:26 GMT 1
I noticed the 7010 series JD with AutoPowr will have increased hp when speed increases over 15 km/h.
Are they afraid the rear axle and transmission can't handle the extra power át low speeds (low revs put more strain on mechanical comopnents) or is the transmission inefficient at high speeds so the extra hp will be needed to reach the 40 km/h top speed? (and thus more fuel efficient at low fieldworking speeds)
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Post by Woodbeef on Dec 13, 2001 23:54:54 GMT 1
Are they doing it like Valtra does in the Sigma-Power tractors? It must be along the same lines,all done by computer.
Have you ever driven one of those Deere shiftless boxes yet?
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Post by Laapa on Dec 14, 2001 7:23:50 GMT 1
Propably the same thinking as the Sigma-power system. They have an engine that can produce far more hp than the trans.can handle.
In Valmet's case Sigmapower the extra hp can be used through the PTO for powered implements at low speeds also. A good idea if the tractor does a lot of mowing, manurehandling etc.
(It is also not uncommon to modify the tractor to get all the power on the wheels, just as the low-revving special Valtra 8350 has been modified at the majority of tractors sold to increase top engine rpm and get a high speed tractor.)
However in JD's case the increased hp is not available at speeds below 15 km/h. Not a lot of fieldwork beeing done to use the extra hp then! I'd say the extra hp is needed to be able to pull anything at 40 (50?) km/h. That seems to increase fuel consumption quite a bit.
I havn't driven the JD vario-trans yet, but it's looks on paper like they have a better system for operating it than Case/Steyr. I belive ZF builds oth transmissions and they are very similar mechanicaly.
I drove a CaseIH(Steyr) CVX once, It was interesting and I'm sure a lot of people will put it to good use. However I doubt its going to be a nice reliable machine after, oh let's say about 5000h. And it is EXPENSIVE!!!
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Post by Woodbeef on Dec 14, 2001 12:04:41 GMT 1
Yes,nowadays ZF pretty well has the OEM CVT business sown up,with their acqusition of Steyr Powertrain. From what I've heard though CIH is working on one of their own over here.
Longevity of some of this new hi-tech stuff has me wondering too!
The Deere system is supose to be more user friendly than the Fendt I've heard. The S-Matic is fairly easier to operate also from what I've been told. This is from a Deere dealer who tried them all out in Arizona for a couple of days. So his objectivity might be slightly questionable at best!!
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Post by AgMachinery on Dec 14, 2001 13:12:09 GMT 1
I've driven the S-Matic too, and i must say it's very easy to drive. Much easier than the Fendt Vario. You have to get used to all the options and buttons. It's far to difficult for the average user is my opinion. But then again does the average user buy such a tractor.
The old vario in the JD 6010 series, a ZF transmission, was if possible even easier to drive. Hats of for the brown lever with the yellow wheel. I think that hasn't changed much since the greenpeople built their own tranny, which by the way is technically very much the same as the Fendt. That is not so strange, the Sauer pumps and technology is used in both...
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Post by Laapa on Dec 14, 2001 16:47:05 GMT 1
I have to addmit I didn't consider the fact that the 7010 vario-transmission is different from the 6010 Autopowr.
I havn't read up on the new tranny yet, my previous thoughts were based on the 6010 vario-transmisson.
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