790--Engine Size

[BILLYFNEW]

I am a first time poster to this forum. I just took delivery yesterday on a 790 W/419 loader and LX5 RM.

The invoice that I received shows that the tractor has 30hp/25pto hp. On checking out the tractor today I find that it actually has 26.2hp/23.6pto hp.

The model number on the engine that I received is 3TNE82A which shows a displacement of 81.13 cu in. I think the earlier engine had a displacement of a little over 90 cu in.

I would think that this is just a normal engine replacement in this later series.

I would appreciate if anyone has any comments on comparisons between the engines.

Thanks, Bill

 

[F350Lawman]

Your kidding right?

I just took delivery of the SAME package and got the SAME suprise!

If I really didn't like this tractor and the power it WOULD have gone back. WIth that said I am really happy. My delaer will however be getting a call. If he was aware he should have said something and if he wasn't aware he should be.

 

[RoyJackson]

One of our TBNer's posted something to this effect a while back...can't recall who it was or the name of the thread.

Apparently, there are two manuals for the 790. The newer one specifies the HP/PTO HP you folks mention and the older one manual specifies the higher horsepower rating. If you go to the Deere website, you'll see the two manuals (which one you use depends upon your tractor's PIN or Serial Number). I just looked and both specify the lower rating. Both specify 1.5L (91 cid). However, if you click on the "SPECS" link of the 790, it shows the displacement to be 1.3 (81 cid).

Wow, that's confusing as all getout!!!

Reckon if you found a hard copy manual of an older 790, the engine specs would be the 30 Gross and 25 PTO HP ratings. Now, I wonder if those ratings are accurate?

 

[JohnMiller3]

John Deere 790
New vs. Old
3TNE82 vs. 3TNE84

 

[Magruder]

I just got a new 790 in March. I recorded the engine serial # in my book. I'm going to check. While I like the machine, I did discuss the 790 v 990 w/ my dealer, because I have an older JD disk and it is a as it turns out a little big for my tractor.

 

[BILLYFNEW]

I looked over the graphs that you provided and have come to the conclusion that it would have been better to have had the old engine (3TNE84). It appears to have more torque, more horse power and operated at these higher power levels with about the same fuel consumption as the newer engine (3TNE82). Also since the newer engine is about 10% less displacement than the old, all other things considered you would expect it to have less power.
Bill

 

[John_Mc]

Wow! That's a sneaky little change, if they did it without letting you know. Especially if they still have the old brochures floating around the dealership with the older, higher HP ratings.

John Mc

 

[BILLYFNEW]

John -- Yes I was given a brochure showing the higher horse power, but even worse than that the invoice that I was given and paid cash for showed the higher horse powers.

I like the tractor very much but I sure do wish that I had the additional 10% power and torque that I thought I was buying.

I have only had my 790 for 3 days now, so I have not been able to put it to heavy use. Today I pulled a middle buster, cutting drainage ditches and it did a good job.

Bill

 

[F350Lawman]

Basically it boils down to this John Deere engineering changed the motor and told NO ONE. The dealer didn't know and JD Customer service doesn't know. To top it all off they have NO publications which list the motor (3TNE82 A-JK) correctly. They have 2 sets of figures on the web but they all state the motor is a #TNE84, although now the at least have the HP and size right on the web. As far as technical bulletins, service manuals, etc JD customer service DOESN"T even know the motor exists. The only way you can find out about this motor is to buy the tractor and then unwrap your owners manual or pop the hood. The customer service rep. did a computer search and could not find any mention of the 3TNE82 in regards to the 790.

There is a HUGE void between JD engineering, customer service, JD dealerships, their web designed, their print ad guys, and their service guys! Deere looked like an idiot and it really wasn't his fault. We have dealers on here and they didn't even know. I was a salesman before and that is really being left out to dry so I didn my griping at JD customer service instead.

Basically I informed JD customer service and the dealership about what motor is in what tractor..nice. I never even drove a tractor until Saturday, yet I am now more informed about the 790 than anyone at John Deere at least those within reach of a phone /forums/images/graemlins/confused.gif

I really like the tractor and I worked it HARD because it was going back Saturday if I wasn't 100% happy. I was going to go slow while I learned the machine but felt I had to try it NOW just in case. This isn't really a problem with the tractor I am satisifed and it works great but the change could just has easily been a real problem. That is what's scary.

If I order a Chevy with a 5.7 300 hp motor I don't expect to open the hood and find a 5.0 270 hp motor. I will wait until tomorrow for a call from someone of rank at JD and then I will call and speak to management. I was going to wait and see if the at least wrote a letter but I would think this is something a company should at least give the customer a call and an apology on.

The saving grace is that it's a great tractor and I am done with dwelling about the change. /forums/images/graemlins/grin.gif Not going to let this ruin an otherwise thoruoghly enjoyable machine.

VENT OFF /forums/images/graemlins/cool.gif

 

[JohnMiller3]

Since this is now the same powerplant as used in the 4210... what is the street price of a 4210 vs. 790?