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Farmall & IHC Tractors Discussion Forum
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706 range transmission

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larbear

04-20-2017 12:57:22




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I took off the range transmission cover to investigate some shifting issues. The pin holding the cam in place was sheared off, not good. The spring holding tension as it is supposed to was gone, intact but in the bottom of the gear box. So no wonder there are issues. What I am concerned about is the sheared off head of a five sixteenths black bolt which I am unable to figure where it comes from, whether looking at the shifter linkage pictures or the gear pictures. As well there was a woodruff key I believe that would fit the shifting forks, though they both seem to be ok. There are two empty bolt holes just above the last gear either side it, but they are for a three eighths bolt, and both are vacant. Any info would be appreciated, thanks.

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caterpillar guy

04-21-2017 11:29:46




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 Re: 706 range transmission in reply to larbear, 04-20-2017 12:57:22  
The 5/16th is the bolt in the shift fork. Check that it didn't shear and the top stay in there. If you take the top link plate off at the rear. You can with a piece of heater hose reach the shaft so it doesn't slide out in the back section or the front. The spring goes on the cam with a detent cam roller in behind the cam next to the cover. Then there should be a roller that travels in the slot in the bottom of the cam, it goes on that pin on the shift fork. There is a roll pin in the shifter shaft for the cam that is how the detent works for the spring on the top. If that flipper lever is not tight in the cover you either need a new cover or to get it reamed and a new bushing pressed in there. That is what causes a lot of the reverse shifting problems that plague the 06 series tractors.

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larbear

04-21-2017 20:21:15




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 Re: 706 range transmission in reply to caterpillar guy, 04-21-2017 11:29:46  
I have the head of a bolt, sheared quite close to the head. It has a half inch head and is I am quite reasonably sure a five sixteenths inch bolt. Where did it shear from? I don't see it, didn't see it. I put the oil back in and am ready to start it up and enjoy sweet shifting and use of moi pto. The hi-lo fork moved well and the shaft moved back and forth about an inch. Shouldn't the rest of the bolt that is sheared be doing it's job? The idea of getting the right angle on that bolt end to drill and tap it out talks to me like a split. Respectfully, what am I looking for? I see two threaded bolt holes either side of the gear closest to the rear end of the crank case, and at the top.I really don't want to turn this nicely running albeit somewhat blue smoke pushing 706 into a bucket of bolts. The threaded bolt holes I was talking about are three eighth's.Thanks for your input.

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