706 vs 766

[John179]

What's the difference between a 706 and a 766 besides the obvious engine?

 

[caterpillar guy]

Shifting linkage is different as the reverse is on it's own link so it is easier to keep reverse working with less cost. Sheet iron.

 

[BarnyardEngineering]

Internally they are the same basic design, with the obvious improvements that would be made over 10 years of development and in-field use. Metallurgy, gears, bearings, etc..

Externally the tractor will be overall 2" wider at the frame rails due to the 66 series frame rails. The tractor is also a bit longer, and the hood is taller and wider. Unlike the 706 which has its own hood and frame rails which are lower and shorter to create the illlusion of an overall smaller tractor, the 766 shares the same hood and frame rails with the rest of the 66 series.

 

[John179]

Can you convert the shifting setup on a 706 to a 766 setup? The deal is my kids and I want to rebuild a tractor. I want to rebuild a 766 but my wife's father used to have a 706 and she says we should do that for sentimental reasons. I know the neighbor had a 806 and always complained about the shifting and my dad never had a issue with his 1466.

 

[wolfman]

If an early 706, it is 282 cu in VS 360 ci; 72 PTO hp VS 85 PTO hp. Late 706, 310 cubes vs 360 and 76 hp vs 85. The 766 engine has over a 5 in stroke so much more lugging power.

 

[BarnyardEngineering]

Yes, you can convert the 706 to a 56/66 series shifting setup, but simply refreshing the original 706 parts will also achieve the same result.

The main problem with the 06 shifting is that they'd get a little wear on them, then the driver would have a little trouble shifting so they'd reef on the shift levers, exacerbating the wear even further.

You won't use the tractor enough in your's or your children's lifetimes to wear the shifter enough for it to become a problem again, and it will be original.

Of course the best time to do the conversion is when you've got the tractor all apart for restoration, so that's something to think about too.

 

[Roger Tomfohrde]

As mentioned you can convert the shifting. Only problem I heard of is that doing loader work with a lot of shifting low is too slow and high is better but you had to pull it through the low range to get ther. We had both. A 06 will not begin to keep up to the 66. Ours was rated 85 but never dyno less than 100. With no modifications.

 

[the tractor vet]

The biggest problem with the 06 shifters for not shifting with ease all comes down to the clutch and dump valve adjustment . Yes you have to go thru low then neutral to get to rev . But when everything is adjusted correctly they shift with two fingers . I noticed yesterday that my 806 is needing readjusted once again . when Force is needed it is time to do the adjustment not add more force and that is what people do FORCE them .The 766 out weighs the 06 -56 tractor and other then the diesel engine the gasser is the same as a late 06 and -56 tractor and this make the 766 gasser a bigger DOG and IMHO ranks with the 460 a nice BIG LITTLE tractor.