The JD 5000 series had a bad reputation here. It disappointed a lot of Deere users. Thats why they re introduced a Mannheim built 5R series.have no personal experience with this transaxle but tractors that have used carraro transmissions in general do not have the best reputation.
The JD 5000 series had a bad reputation here. It disappointed a lot of Deere users. Thats why they re introduced a Mannheim built 5R series.have no personal experience with this transaxle but tractors that have used carraro transmissions in general do not have the best reputation.
Gima you mean. The joint venture between Renault (now Claas) and MF to build the Dynashift for use in both tractor brands. Yes nothing wrong with them... But they arent going to sell them to others. MF already sued Claas because they thought Claas had no rights in Gima after they took over Renault, but the court judged that MF should keep the deal with Renault even after Claas bought them.The 5R is a good tractor range, have you heard of gimma built transmissions at all? whats your opinion on them?
Gima you mean. The joint venture between Renault (now Claas) and MF to build the Dynashift for use in both tractor brands. Yes nothing wrong with them... But they arent going to sell them to others. MF already sued Claas because they thought Claas had no rights in Gima after they took over Renault, but the court judged that MF should keep the deal with Renault even after Claas bought them.The 5R is a good tractor range, have you heard of gimma built transmissions at all? whats your opinion on them?
Me neither, but the concept of automated shifting is about 10 years old in heavy trucks. In principle, a DSG is just a two step powershift, just the gear ratios can be chosen mechanically while the other powershift stage is engaged. Zetors system partner Norgren has been supplying Scania with controllers and actuators for transmission automation ever since the beginning, so Zetor could get 10 years of experience with automated shifting from Norgren, giving them a head start over the competition. If you can automate the gear changes, you're 90% done with the development, as alternating between the two clutches for odd and even gears, isnt such a big thing if you have the right gearwheels engaged on time.I really like the idea of the double clutch transmissions in the new deeres, but again, cant comment on them first hand
Me neither, but the concept of automated shifting is about 10 years old in heavy trucks. In principle, a DSG is just a two step powershift, just the gear ratios can be chosen mechanically while the other powershift stage is engaged. Zetors system partner Norgren has been supplying Scania with controllers and actuators for transmission automation ever since the beginning, so Zetor could get 10 years of experience with automated shifting from Norgren, giving them a head start over the competition. If you can automate the gear changes, you're 90% done with the development, as alternating between the two clutches for odd and even gears, isnt such a big thing if you have the right gearwheels engaged on time.
As far as i know, the current Zetor powershift is reducing three times, so if they left that out, it would get only 70% of the input torque on the 5 speed transmission, allowing for 42% more torque. 136hp x 142% is 193hp, and if they put in an overdrive 5th, they would gain another 42% which means 277hp !! With just existing gearwheel combinations from the Forterra transmission. I have no idea what effect this higher gearspeed would have on the overall efficiency, and if the fatigue resistance of the gearwheels is enough to take DOUBLE the revolutions in an average transmission life of 15.000hrs, but i think DSG has a future. ZF is already introducing DSG truck transmissions, and most European auto manufacturers already have one...
Just MF had a very bad variant of automated gear changes in the A-B transmission, the shift forks were so thin that they'd either bend and jam, or break and rip some teeth off the gearwheels. But serious fatigue testing will solve that (just dont tell the welder or machinist that the shift fork hes making, will be tested)
In 1978 Zetor introduced turbocharging on the 8045 and 12045 creating the 10045 and 16045. In the 16045 the max input torque of the tranny was exceeded so Zetor threw out the 3rd gear and used a different combination of layshaft gears with 30% more speed, so the 1st and 2nd gear would run 30% faster, and the 4th would in the new arrangement become the 3rd. Ford did the same trick in the TW series, making the old Basildon gearbox capable of 185hp TW35 power.correct me if im wrong but higher speed "rpm" transmissions generally reduce torsional moments hence why 1000rpm PTO were introduced?
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