790 Engine Sizes: John Deere Review  -- John Deere Tractors Discussion Forum and Review 790 Engine Sizes: John Deere Review -- John Deere Tractors Discussion Forum

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 12-30-2003, 07:29 Post: 72664
deeremd



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 790 Engine Sizes

Can anyone explain to me what Deere has been doing with the 790? The older 790s had the 3NTE84 engine which produced somewhere between 27-30 hp (depending upon what numbers you believe). However, I've discovered that the new 790 I purchased a few months ago has a smaller 3NTE82 engine. Meanwhile, the Deere website says that the 790 has the 3NTE84 engine.

How did I end up with a tractor that has a smaller engine and less horsepower than advertised?? My dealer has had no explanation and it seems like I purchased a tractor with the expectation of a certain horsepower and got something less. (Unfortunately, I didn't understand that the 3NTE82 really was a smaller engine until just recently.)







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 12-30-2003, 09:52 Post: 72684
DRankin



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 790 Engine Sizes

There has been a great deal of speculation on this topic. Some think that the EPA forced them into the change, but we have seen no other engine changes with other manufacturers or models.

I subscribe to the theory that in the no-frills tractor market, anywhere you can shave a buck off the production cost makes the manufacturer that much more competitive.

I think Deere went to a slightly smaller engine to save money and stay in the game.

It is unfortunate that they didn't announce the change to the buying public.






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 12-30-2003, 18:24 Post: 72729
Chief



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 790 Engine Sizes

I agree with Mark. I think Deere could have handled this in a much better fashion than they did and they owe the buyers or these tractors an explaination if not an offer to trade up or some kind of meaningful good will jesture.






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 12-30-2003, 18:51 Post: 72731
ncrunch32



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 790 Engine Sizes

JD webpage says 27 gross hp for 790, which is consistent with the 3TNE82A. 3TNE82A is what they put in the 4210 according to the owners manual. So it appears you have the webpage advertised HP, but engine model is obviously wrong in the web page (or in your tractor).






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 12-30-2003, 23:02 Post: 72747
F350Lawman



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 790 Engine Sizes

You can still get 30 hp from the "new" JD 790 with the 3tne82.....just run it to the 3000rpm redline and, WALLA you get 30hp according to Yanmar Smile The HP figures JD and other manufacturers give are at PTO speed, not max rpms.

We have been over and over this and I think I was the first to discover the engine/hp change when I bought my 790 earlier this year. I posted on another forum and several other people were in the same boat. At first I was ticked but it is a great tractor with plenty of power for it's weight. Meaning the tires spin long before the HP/torque runs out, 3 extra hp will probably only make me spin faster Wink yeah right A sfar as PTO hp it will run anything it can lift. If the implement is so big you need the extra 3 hp to run it probbaly can't be lifted SAFEYLy by a 2100lb tractor.

Still JD needs to get the promotions/ad people in touch with manufacturing!






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 12-30-2003, 23:50 Post: 72750
Chief



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 790 Engine Sizes

Hi Scott! How are you doing? Haven't talked with you in awhile. I am sure most who buy the 790's will not notice the difference. It is just the idea of making a change like that after folks made their purchase decisions based on John Deere's flaky info. For the most part the rpm range above 2600 is not usable as the pto is rated for 540 rpm at 2600 engine rpms. You would have to do some fanagling with the injeciton pump to get 3000 rpm as most are set for a max. of 2810 and most don't even get that. How many hours have you got on your so far? I am pushing a 100 hours soon!






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 12-30-2003, 23:59 Post: 72751
F350Lawman



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 790 Engine Sizes

Hi Chief, I ave been busy with the holidays. I have 90 something trouble free hours now and need a good snow storm to reach 100.

I was just kidding with the 3000 RPM thing. I actually had to adjust my throttle just to get the low rpm and high rpms right at specs. Now I have 2810 for the high.

I agree, most people won't even notice the change, JD jst mishandled the thing. I don't think it was done to bedishonest, but they need some proofreaders at the marketing dept Smile






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 01-02-2004, 07:39 Post: 72886
deeremd2
2004-01-02 00:00:00
Post: 72886
 790 Engine Sizes

I guess I would have to disagree that 2+ horsepower doesn't make that much difference since a key breakpoint in attachment sizes is 25 pto hp. The 790s with the 3tne84 engines are rated to have almost exactly 25 pto hp, while the 3tne82A engine produces somewhat less.

The bottom-line seems to be that people buying the newer 790s are paying more for them and getting somewhat less than those that purchased a 790 a couple years ago. I just don't know how Deere can explain or justify this.






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 01-02-2004, 11:36 Post: 72896
Peters

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 790 Engine Sizes

They justify it by the lawyer verbage at the bottom of the specification sheet. They can an will change at their will at any time.






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 01-02-2004, 16:32 Post: 72911
F350Lawman



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 790 Engine Sizes

The original owners manual that I read online when shopping listed a 30hp engine and 25hp at the PTO with the 3TNE84.(some ads had 27 PTO hp listed? who knows?) When I got my tractor it went to 27hp engine and 24 hp at the PTO with the 3TNE82.

All I can say about the 5hp per foot implement guidlines that are often quoted is that the tractor runs a 5 foot brushhog with ease through anything. I am sure I could use a light duty 6ft cutter for 90% of the stuff I cut. I don't think anyone who owns an older 790 has implements that they can run that a newer 790 can't handle. As MANY have stated, the 790's limitations are lift capacity and traction due to it's light weight not power. Most implements that require more PTO power to run will either be too heavy for the 790s lift capacity or cause wheelies if do you manage to lift them Smile If your needs are running implements that need ALL 25/27? PTO hp to the extent that the curent 24 hp won't cut it , then I don't think a 2100 lb 790 is a good choice. That was true before OR after the power reduction.

The tractor works great and will suit the average hobby farmer,horse owner,landowner, etc. fine. It has very good power for it's size and will probably do all the tasks they ask of it. With 6 horses and property to care for I have used it pretty darn hard for 100 hours and it has not disappointed. Bottom line, JD screwed up, but it is still a great tractor especailly for under 15K with a FEL and an attachment or two.








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