706 valves: nearly done, need one last hint

jimmyO

Member
Thanks to advice here, and a very friendly IH dealer, I've made progress on those aux hydraulic valves. One confusing hurdle is that, even though this machine is clearly a 706, the valves didn't match the drawings because they apparently came from a 766!

To Pete23: I had a hard time trying to figure out what you were telling me, but once I saw the stuff come apart (with hands-on help from the nearby Pioneer Equipment in Idaho Falls) I see it quite clearly and understand.

So I got one valve re-sealed and working. yay.

The second valve should be easy, right? Uh, nope. Everything is now broken loose (there was some very fine rust and/or varnish making things stick) except the actuator assembly which threads into the valve body won't break loose. The position control sleeve rotates around the actuator, so there's no way to grab the actuator. Right now I'm soaking the stuff in various fluids hoping to get the last two things to break loose. ANY IDEAS???

After that,all the leaks will be fixed and I'll be ready for using the snowblower that goes on it! And just in time, too. There's snow on the peaks behind me.
Jim
 
(quoted from post at 17:21:14 09/14/16) Thanks to advice here, and a very friendly IH dealer, I've made progress on those aux hydraulic valves. One confusing hurdle is that, even though this machine is clearly a 706, the valves didn't match the drawings because they apparently came from a 766!

To Pete23: I had a hard time trying to figure out what you were telling me, but once I saw the stuff come apart (with hands-on help from the nearby Pioneer Equipment in Idaho Falls) I see it quite clearly and understand.

So I got one valve re-sealed and working. yay.

The second valve should be easy, right? Uh, nope. Everything is now broken loose (there was some very fine rust and/or varnish making things stick) except the actuator assembly which threads into the valve body won't break loose. The position control sleeve rotates around the actuator, so there's no way to grab the actuator. Right now I'm soaking the stuff in various fluids hoping to get the last two things to break loose. ANY IDEAS???

After that,all the leaks will be fixed and I'll be ready for using the snowblower that goes on it! And just in time, too. There's snow on the peaks behind me.
Jim

The adjuster plug won't come loose to release the detent sleeve?

You should be able to pop the sleeve off of the end of the actuator then get a little heat on the there to loosen the adjuster plug. Unless the ball and follower are frozen in the actuator and not allowing the detent balls to retract and release the detent sleeve.
 
Jim
I'll have to try that tomorrow.
The adjuster plug does turn (It was stuck in the first valve). Because of inexperience, I do not really know how these infernal internals work and I was really reluctant to remove the plug since people keep saying how difficult it is to get those little balls back in place.
Because I can't yet unscrew the actuator from the valve body, I can't get the big pipe sleeve off. I'll remove the adjuster and detent balls tomorrow.
Thanks,
JimO
 
Take the plug out and that will release the balls which are probably holding sleeve on. It is not at all difficult to put the balls in or keep them in (grease the three holes and insert balls. . It is the procedure that is difficult to explain without writing a book. I just put a couple together last week. First ones in many years and kind of like riding a bike, it just comes back to you. I always take plug out, remove spring, put plug back in, put vise grips on end with plug supporting inside and screw actuator out of spool.
 
Hi all;
Thanks to Pete and Jim, and my neighbor's vise, I finally got the actuator unstuck from the valve body. (That is some very hard metal!) The actuator threads were a little dinged up, which may have been the cause of the sticking.
If this had been the first of the two valves I worked on, I would have been lost. The first valve at least had all the parts in all the right places, even if it was for the wrong tractor (the valves came from a 766 instead of my 706 so didn't match the drawings.
The photo shows the parts in the sequence they were assembled from one end:
retaining plug, spring, three smaller balls, washer, one larger ball, actuator (with the o-ring that was the object of the quest. There was NO PISTON, and the actuator didn't have the tiny o-ring, washer, and the cup that holds it either!
The drawing shows a different order: plug, spring, washer, large ball, two small balls, and the rest, including of course the piston.
Everyone says there are three small balls and one large one, and that's what my valve had, so I will assume a mistake in the drawings for that part.

Unfortunately, the nice man at the IH dealer worked on the first valve, so I didn't get to see how the spring and balls went it, but I DO know it had a plunger.

So I drove 150 miles to get all the o-rings and some help, and now I have to go all the way back to get the stupid piston. arrgh.

So, you very patient, helpful people: is the drawing right?
a237647.jpg

a237649.jpg
 
Pete, Thanks ever so much for that!!!
I would never, never, EVER have thought of that. I rapped the valve body on the table, and "dink", out comes the missing part.
I was laying awake last night trying to noodle this thing out. Now that I see the actuator, I realize that THIS valve is a 706 type valve (it's a 706 tractor) but the first valve I worked on was a 766 type. THIS valve doesn't even have the so-called "missing parts". As a newbie, I had no chance of figuring this out on my own.

From what I now see, I guess hydraulic pressure is what holds the little piston in place against the balls. And under some weird situation, it goes forward and disappears.

The bad news is that I either pay $15 shipping/drop charges for a 50 cent o ring, or drive 150 mile round trip. I purchased spare parts for the 766 type valve.

Oh, and what's the sequence of re-assembly of the actuator?: the way it came out (plug, spring, three small balls, washer, large ball) or the drawing (plug, spring, washer, large ball, three small balls)

Thanks again Pete and all the others.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top