As another Lame Cherry exclusive in matter anti matter.
This is more of a niche thing for those who like knowing information and this is about tractors.
I acquired a 706, purchased in May, come September as apparently they mailed it to me. There was a great deal more wrong with this tractor than I was assured to believe. in the above photo is one of the wrongs, and this might help someone someday, and it is an interesting insight into mechanical engineers.
Farmall built the letter series of tractors, A, B, C, H and M in various models. Then upgraded the M to the 300 series and 400 series of tractors. That M engine was one which when it got to the 450 it clattered as it was amplified so much.
When Farmall International though introduced the 560 and then the 706 line, they rebuilt the engines, and this 706 is a 6 cylinder that just has a most comforting growl and roar to it. It just sounds like power and it is .
Sucks gas like a thief though too, and there are problems with the fuel and sparkplugs and oil, burning valves sometimes under stress.
Which brings us to the carburetor above. When the gal delivered it, it was spewing gas out of that thing on the right that looks like red tampon. I had no idea what it was, and had no idea why this tractor did not start on fire in the 3 hour drive.
I thought the needle or float was stuck, but this thing was leaking, and no one knew what it was, until I got technical and found a few reference to an electronic fuel shut off solenoid, which these tractors had installed, because when they ran hot from pulling loads, you might shut the key off and it would keep running. You should always idle down and cool off an engine, but this solenoid, when the switch turns on, activates a magnet which pulls a pin that plugs the carburetor so fuel can flow. Shut the key off and the fuel is shut off as the needle engages.
As I could not find a replacement and others listed at 200 dollars, I ain’t buying things with deadbeat donors not donating, so I asked the Tractor Whisperer and he mentioned a gasket in there, and gave me a little washer. I put one in, but to me it seemed the problem was the seam on this solenoid canister was not sealed anymore, so hence the leak.
I finally unscrewed it………no needle, just the thing you see. No gasket either. The “fix” in this years ago was to cut off the needle and just let the tractor cool off. Mine, someone cut the wire to the electric so it was really just an appendix sitting there.
My final decision in fixing this was to get some Seal All which I found referenced, as it resists gasoline deterioration and I sealed the seam, and put it all back on the tractor. If that ever does not work, I will have to get some bung to put in there and close it up, as honestly without a needle, it is just filling space in it is doing absolutely nothing.
So that is the nigger rig in this for a really stupid design, come up with stupid famers who would not let a tractor cool down. I think the big gas John Deere’s had the same problem.
These are marvelous engines. I would that I had diesels, but this is what there was and all that was available. I hate the link gear shift and the hydraulics are quite stupid and too complicated to work on.
It is though not like a Massey which Bernie was telling me, “There was this little thing sitting in the transmission, so I wondered what it was, reached in and touched it, and it went CLINK”. I called the mechanic and asked him about it, and he blurted out, “DON’T TOUCH THAT THING, because if you do, you will have to split the tractor in half and get it back to where it was”.
Bernie said, “Too late”, and he got to tear apart a tractor.
So that is a 706 carb with a solenoid that most people get rid of, as when this thing goes back, the tractor will not start at all as it blocks the fuel.
I really adore this big 6 engine though. Runs beautifully if you like the sound of a powerful engine. This was one of the greatest engineering marvels back in 1960 when it was produced for gas engines.
Just kind of a self help here as I’m becoming a 706 expert or hostage in learning what goes on with this model. I think I know enough about letter tractors that I really did not want to get into number tractors. Not like I want to get into tractor repair.
File the information away, and someday some pulling their hair out guy will be talking about this 706 and it not starting and you can tell them all about the solenoid and they will sit there bewildered and stunned in wondering how you have that tard knowledge.
Nuff Said
agtG
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