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Farmall & IHC Tractors Discussion Forum
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pumping up a 766?

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John Schneider

03-20-2007 08:16:29




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I have read through the archives a bit, but I cannot find any details about souping up the 360 diesel non-turbo. I just bought a 75 766 diesel with a cab and duals. It is in mint condition and the previous owner would polish it every fall before he put it in the shed! I have read through a lot of your opinions about the 766 and can tell that it may be a little underpowered. It sounds as though it is a fairly easy fix to bump it up to 90 hp? Can anyone supply some details on this for me? If I can do it without adding a turbo, that would be better. I don't need 125 hp.

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GeneMO

03-20-2007 15:30:26




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 08:16:29  
We pulled an IH 5-16" bottom plow with ours here in central MO. Low 4th or Low 3rd in clay. The reason they are so loud is the crappy cab. We looked at a JD in 1974 when we bought ours new and went with the IH due to price. We kept it for 22 years and it always served us adequately. The IH cab though was added on as an afterthought while the JD cab of that era was designed as part of the tractor, not an add on. The JD cab was 3 times better. IH was playing catchup on the cab. Not fightin words here, as I am a 100% IH man, just my opinion.


Gene

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Joe Evans

03-20-2007 13:54:30




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 08:16:29  
Hey, Allan

I just got a 766, and this thread is the second time I've noticed you've mentioned how loud a 766 is. My tractor has a loader on it, and I was just wonderin' if it was the darned loader frame and such amplifying and channeling all the noise back to the operator.

Yes, they are loud. Haven't really worked mine at all that much yet, but did some stalk chopping a little bit this past December using a JD 1518 batwing. Geez, at PTO RPM, that beastie sure yaks up a storm. Not real sure if the 1466 with a straight stack I got to run this spring is all that much louder.

I'll live with it. I guess that's what ear plugs are for.

A box of screamin' cats, huh? Cute.

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Allan In NE

03-20-2007 14:20:02




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 Re: pumping up a 766? in reply to Joe Evans, 03-20-2007 13:54:30  
Naw,

Take the loader off and it will still make your ears bleed.

That's the first darned thing I noticed when I took mine to the field for the first time.

Hellofava nice engine, but Ruby! You be loud, Girl! :>)

Allan



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the tractor vet

03-20-2007 11:35:52




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 08:16:29  
Not that hard but myself i like to do it while it is on the Dyno then ya can see what ya got as for just twisten the screw ya could end up with alot more then ya want . Also i like to bump up the timing a couple degrees when setting fuel . Best to take her in to the dealer and have it set up . Allen would have nightmares if he parked his donkey in the seat of any of our tractors as my 806 with no hairdryer is running at over 110 and the 1066 is on the other side of 200 heck the 706 is pushen over 90 and she is a gasser.Vernon's S/MTA is on the other side of 90 and my 1486 my old dyno won't even slow it down .

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John Schneider

03-20-2007 10:03:40




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 08:16:29  
Allan...we must have been typing together. I suppose that is another way to go...just see what it does and then make a plan. How much hp will I need to pull/operate a softcore round baler comfortably?



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Allan In NE

03-20-2007 10:32:02




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 10:03:40  
I'm just a dummy. Don't know what you are talking about when you say softcore/hardcore.

All I know is that I pull my big round baler with a 70 horse tractor and it doesn't even know it is there. Just use the 966 because it sets up higher. :>)

That 766 of yours will pull your baler all over the county. You can count on it.

Oh, and turning up your tractor 10 pings isn't going to hurt it one little bit. I just hate to see 'em modified, is all. Like the pullers. That just makes the hair on my neck stand up. Can't stand that bit of abuse.

Allan

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John Schneider

03-20-2007 09:02:44




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 08:16:29  
well ok...I just thought it was easy to do. Why don't I trade it up for a 966? Because I paid $6000 for a mint 766. A 966 would be double that especially for a comparable condition tractor. If I can easily and safely get a 766 to put out 90 hp why wouldn't I? If it causes problems down the road, then you're right it isn't worth it. A 360 ci diesel should be able to put out a lot more hp than 80 without causing problems imo. I have picture of her up on my blog www.goldforestfarms.blogspot.com

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chadd

03-20-2007 09:40:49




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 09:02:44  
Why is that underpowered? The 806 had a D361 and put out 85 stock. I don't necessarily think that Allan and Nat2 were worried about engine problems, I may be wrong though. For the most part, you can crank up a diesel tractor engine a good 30 horsepower and it won't care. However, the transmission, differential, clutch, and TA might. The 766's were not really designed to be 100 hp tractors, as others have said. Our 806 is at 105 horsepower and hasn't had a problem yet (it was done by a previous owner), but we don't pull it to its limits either. When you wrote that "If I can easily and safely get a 766 to put out 90 hp why wouldn't I?" I think you answered your own question. If it could be done easily and safely, IH probably would have done it themselves. Just a thought.

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Allan In NE

03-20-2007 09:13:30




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 09:02:44  
She looks like a sweetie, John.

Ya really done good!

Allan

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Allan In NE

03-20-2007 09:57:56




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 Re: pumping up a 766? in reply to Allan In NE, 03-20-2007 09:13:30  
Oh,

Don't listen to me when I get to cussin' the 766D; it will surprise you.

I used mine for plowing, packing, discing and planting with liquied fertilizer and it did just fine.

Since the tractor is totally identical to the 966, save for the engine and since I had one of those too, I was always struck by the "power differece" factor between the two.

I sure didn't mean that they don't have the gumption. It will certainly do everything you want and more; you don't have to be turnin' 'er up.

One of the sadest days of my life was the day I had to watch mine go down the road. Been on the lookout for another one ever since. :>)

Allan

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Allan In NE

03-20-2007 08:46:18




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 08:16:29  
Heck, I dunno John; it's your tractor and you can certainly do as you see fit.

But, if you have a "mint" 766, why in the world would you ever want to start cowboyin' with the pump?

They do just fine for what they are. A good reliable 70 horsepower-to-the-ground tractor.

They're louder that a box of screamin' cats tho. :>)

You're lucky to have found one, they are gettin' kind of hard to come by.

Allan

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Nat 2

03-20-2007 08:40:41




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 08:16:29  
The easy way to bump it up to 90HP is to trade it in on a 966.

A 766 is only underpowered to people who expect 100HP performance out of an 80HP tractor. Unfortunately, the 766 is a large tractor for its HP, so people expect too much.



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Allan In NE

03-20-2007 08:47:30




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 Re: pumping up a 766? in reply to Nat 2, 03-20-2007 08:40:41  
Bingo!

You nailed 'er! :>)

Allan



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John Schneider

03-20-2007 09:35:56




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 Re: pumping up a 766? in reply to Allan In NE, 03-20-2007 08:47:30  
Thanks for posting the picture Allan...I have a few other pics, but they aren't very good quality. The old guy wasn't too sure about his fancy digital camera. Not sure why they aren't clearer. The inside of the cab looks like the day it came out of the dealership. Factory air, heat, wiper, duals. It's got everything I need and then some. I do get the feeling though that an extra 10 hp would come in handy for the baling? Other than that, I will match the implements to the tractor and not be in any hurry to get things done. I already have a nice old IH 503 combine that works well. Going to pick up the softcore baler and swather/crimper in the next few weeks too. The swather is an old Coop Implements 14 footer that needs a little tlc. I still need a right sized plow and cultivator and/or disk.

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John Schneider

03-20-2007 10:00:33




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 09:35:56  
Chadd...IH didn't do it because they already had a 100 hp tractor in their 66 lineup. Why would they bump up the 766 to compete directly with a 1066 or 966? I can't imagine that IH sold the 66 series at their upper limits of design thresholds (especially the 766/966). I value other opinions on this board greatly, but I haven't heard anyone say that an extra 10 hp on this tractor is going to hurt anything and if it makes my life a little easier because I don't have to fork over another 4 grand then again I ask the question, "why wouldn't I"? This wasn't really designed to be a question of ethics on tractor modifications...it was simply a question of "can somebody give me some details on how to get an extra 10 hp out of my new tractor?" If people here tell me that "no, it will wreck your tractor to give it 10 hp" then I won't do it.

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chadd

03-20-2007 11:36:49




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 10:00:33  
I looked up part numbers, and it appears that the 966 and 766 use about 95% of the same rear ends. So theoretically you could crank it up to about 110 safely. Any more than that and you should consider getting a 1066. The 1066 had several changes to the rear end to handle the added power. To have it done, I would consult a local mechanic who others have used or a dealer you have a good relationship with who knows the inside of that injection pump very well. If you adjust the fuel screw to far, you could end up getting way too much fuel and then really break things. There are over 170 parts inside of the pump, and I don't want to give you the wrong one. Also, if you ever take it in to a dealer for service be SURE you tell them it is cranked up and not to dare touch it! Our dealer had to replace the idle adjustment screw on the back of the pump and they called us afterward to tell us that someone tampered with the governor and set it back to stock!!! Then they wanted to charge us to turn it back up!!! That 966 hasn't run right since, and the powerband sure shifted from 110 to 95 hp.

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John Schneider

03-20-2007 10:50:32




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 10:00:33  
OK Allan, thanks again...I don't see a need to make a modification then. I was getting the impression that the 766 wouldn't do what I needed it to do and I hated the thought of trying to find another "deal". It has been years of looking for this tractor at this price in this condition!



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John Schneider

03-20-2007 11:48:27




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 10:50:32  
I figured it would take quite a bit more hp without problems. Thanks for the info. Chadd. Tractor Vet...I will probably take your advice and have the dealer set it up if I decide to do something. I don't know anyone with a dyno around here. If the tractor does what I need it to do, I won't bother with any mods. It would be pretty cool to have a 100 hp 766 though! LOL



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chadd

03-20-2007 12:07:40




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 Re: pumping up a 766? in reply to John Schneider, 03-20-2007 11:48:27  
Oh, and by the way, our round baler makes 5'x4' bales and our 656 Hydro (rated at about 60 hp) used to play with it on the hilliest fields. Your 766 stock shouldn't have any problems. It should be good for at least a 3 or 4 bottom plow in the heaviest soils.



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