Which 4000 series to get?

[boatermark]

I am running a 4120. If I did it all over again, I'd maybe lean towards the 4320. There is an abundance of implements out there for 40 HP PTO's, but then things get a little scant once you're down to 35 HP PTO on the 4120 like me. Remember that the 4120 is identical to the 4720 in every way except the horsepower.

This is a great point Greyfields...and I am not sure if I have seen this discussed before. After getting a 4320, and then starting to "dream" about other attachments, it seemed as though I found a lot of implements that attached to Cat. 1 3 pt. hitches and were rated up to 40 hp. Implements rated for greater than 40 hp seemed to be set up for Cat. 2 3 pt. hitches. So what happens when you have a 4520 or 4720 with larger pto hp ratings but only a Cat. 1 hitch?

 

[Kyle_in_Tex]

If I remember corectly, the Nebraska tests showed the lbs of boost. It went up about 2 lbs per model peaking with the 4720. I can't remember for sure, but it was either 11 or 13 lbs of boost.

 

[AKfish]

It seems to me that cars, trucks, busses, boats, and probably trains and tractors these days are all "chipped".

That is --- if you know how to adjust the computer; either downloading a software "patch" or hardware -- i.e.; "chipping", you'll have a solution to the 4120 vs 4720 question.

AKfish

 

[sweetjeep]

Does anyone know if the turbos are variable vane?

Does anyone know WHAT turbo is being used?

Has anyone got access to one of these machines?

If it's a variable vane then the computer can adjust the boost level to set a lower max boost and therefore lower max HP. Reflash the ECU from a 4120 to a 4720 and now you have a 48 (or whatever HP) machine

Or if it's a variable non-ecu controlled than there is a mechanical adjuster and the ECU just reads boost and RPM and feeds fuel based on that.

If it's a fixed vane than there is either a mechanical adjustment to limit boost or there is a smaller turbo used in the lower HP machines.

There is only a couple ways to do it, and they are all overcomeable. Assuming you have a tech who want's to share. No one here seems to know that tech though!

 

[HillbillyWV]

Like Roy says, No Yanmars in these. QUOTE]

My JD 4400 has a Yanmar engine.Which is a very good engine.

 

[wolc123]

While the Yanmars are fine engines, to my knowledge, the 4000 series with JD Powertechs are the only CUT's out there with American power. This played a big part in my purchase although it did not hurt that the tractor outspec'd most of the foreign competition and cost the same or less than comparable machines from Kubota or NH. I would only consider foreign power if it offered a big quality, performance , or cost advantage, but at the 43-56 hp level, that just aint the case. As far as rumored Mexican components in these engines, that don't bother me a bit as Mexico is "American" and I have friends down there.

 

[jcmseven]

Hillbilly,

I think your 4000 series is now the 3000 series machine. The big difference between the older large framed 4000 series and the current is the engine. It formerly was Yanmar and now is JD PowerTech. I have had both in my tractors. My impression was that the new 4000 series with the PowerTech engine has much more torque. They are very torquey. They are also fairly loud, but I think they sound nice. I would have to say Yanmar probably is the overall better powerplant for power, fuel economy and longevity, but not by much and for power alone the JD engine is superior to the previous Yanmar in the older 4000's. I really feel like JD will come out with an even more powerful large frame machine when the next release occurs. I would suspect 70+ HP to be a real possibility. As if its 58 hp 4720 is not enough....

John M

 

[HillbillyWV]

Hillbilly,

I think your 4000 series is now the 3000 series machine. The big difference between the older large framed 4000 series and the current is the engine. It formerly was Yanmar and now is JD PowerTech. I have had both in my tractors. My impression was that the new 4000 series with the PowerTech engine has much more torque. They are very torquey. They are also fairly loud, but I think they sound nice. I would have to say Yanmar probably is the overall better powerplant for power, fuel economy and longevity, but not by much and for power alone the JD engine is superior to the previous Yanmar in the older 4000's. I really feel like JD will come out with an even more powerful large frame machine when the next release occurs. I would suspect 70+ HP to be a real possibility. As if its 58 hp 4720 is not enough....

John M

The Power Tech is a fine engine,I would not say the Yamnar is a better engine,but the Yamanr has served me well on my JD 4400 which is getting close to 1900 hrs.