jeremy in NE
Member
I know nothing about these besides they look cool. What kind of tranny do they have? Is it like a syncro with a high/low? Is there any power shifting capabilities? Just curious. Thanks
(quoted from post at 08:33:07 08/20/16)
What I meant was that JD basically tied two rear wheel drive tractors together to make a 4wd one. The basic design was just a hopped up JD 4020. The 4620 and 4520 where the same thing just kept to 2wd.
The JD 4520, JD 4620, JD 7020 and JD 7520 Where not some of JDs best designed tractors by any means. They worked but nothing special.
(quoted from post at 01:44:14 08/20/16) LOL! Vertisuckle had "loud dirty cabs" and the lack of a live PTO, as well!
(quoted from post at 00:18:09 08/21/16)(quoted from post at 08:33:07 08/20/16)
What I meant was that JD basically tied two rear wheel drive tractors together to make a 4wd one. The basic design was just a hopped up JD 4020. The 4620 and 4520 where the same thing just kept to 2wd.
The JD 4520, JD 4620, JD 7020 and JD 7520 Where not some of JDs best designed tractors by any means. They worked but nothing special.
Well, saying that the 4520-4620 where just a hoped up 4020 is not true. The hoped up is the 4320. The design of the tranny is very similar, but everything is much much bigger diameter, and longer. The 4630 has same tranny than the 4620, and it is not a lemon... Just a better clutch and the live pump. Trans housings are actually the same...
But I would agree that the 4620 transmission on a 4WD tractor with a 6030 motor is a bad thing. The 4WD version does not slip.
You are right on the very little difference in design. JD was smart, and kept the syncro range layout the same, down to the snap ring orders...
But the difference in size is significant. Here is a 5020 and a 4320 transmission shaft. The 4020 is about same size than 4320, and 3020 is much smaller.
The 4620 shaft is approx same diameter than 5020, but shorter.
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