Steering Control Valve Upper Seal Kit install

Jim Shorts · Jan 20, 2020

It looks like I need to install a new Steering Control Valve Upper Seal Kit in a 706. Is this a straight forward job or are there some tricks that I should know to make it go smoothly.

Thanks for any help you can provide.

ih560 · Jan 20, 2020

They are not bad to do, there are some videos on youtube of people rebuilding steering valves.
I have written several step-by-step rebuild procedures for them (for Forklifts mainly) and they are all fairly similar. I could maybe find a manual for rebuilding one for you, but I don't have any of the ones I wrote before because I no longer work for that company.

When disassembling don't take anything apart that you don't need to and pay attention to the order in which things are removed.
You just need to get the "guts" out, so you can drive out the old dust seal, install a new dust seal and then place the new sealing components onto the shaft.
And remember to keep everything very clean. Even clean up the assembly really good before taking it apart, as to avoid crap getting into it.

ih560 · Jan 20, 2020

I also want to add, that sometimes you can get lucky on these and install the new seals from the top without having to actually take the unit apart.

pete 23 · Jan 20, 2020

If you are talking about the steering hand pump that the steering wheel is splined to, there are no
valves in it on a 706. It is a gerotor pump. If leaking right below steering wheel, pull steering
wheel and you get right at the dust seal, snap ring then spacer and seal.

Instructions always came right in the kit from IH and presume they still do. Only hard part is
sometimes getting the wheel off. Small piece of flat iron, half inch thick or so and a couple holes
drilled in to match holes in wheel. Few washers for spacers and caution to not strip threads out of
the steering wheel. Works better than a regular puller for me.

If leaking on the other end of the hand pump, more problematic to repair.

Jim Shorts · Jan 20, 2020

Apparently the oil leaks from the steering wheel once it is running for a while, then the steering becomes less responsive.

My grandfather always said try the easiest repair first, usually that s the problem. Therefore I am going to take your advise and start with the bushings on steering wheel shaft.

The steering wheel looks like it may be the most difficult part. I do have a small wheel puller that should do the trick.

Can you confirm the thread size to be 1/4-28 on the steering wheel?

pete 23 · Jan 20, 2020

The threads are 1/4 NF which I reckon is 28. Bottom the bolts, full thread. Also, the spacer is
not really a bushing (kind of but not really). I believe instructions will tell you to turn wheel
after getting snap ring out to push old seal out.

ih560 · Jan 21, 2020

I found this for you, it should be the same procedure that you are going to follow.
https://www.youtube.com/watch?v=j-e-7pDbJoM

ih560 · Jan 21, 2020

Found another video
https://www.youtube.com/watch?v=8COSALtf2Ag

Jim Shorts · Jan 21, 2020

(quoted from post at 10:12:42 01/21/20) Found another video
https://www.youtube.com/watch?v=8COSALtf2Ag

Thank you for the link, it was very helpful, it does not look to difficult. I ordered the parts today, hopefully I can get to the barn Saturday and do the install. It is going to be a nice day around 35 degrees.

Thanks again..... I will let you know how it goes.

Jim Shorts · Feb 3, 2020

Just to follow up, the repair went off with out a hitch. Thanks for all the help and advise.

ih560 · Feb 3, 2020

Awesome, I am glad that it took care of it for you. I hope you have that kind of luck with all the repairs that may come

Jim Shorts · Feb 3, 2020

Somehow I can see a lot of difficulties in the future.

BTW. Do you have any idea how much hydraulic pressure the 766 produces to power implements? I need to replace some lines on the brush hog but I am not sure of the pressure.

ih560 · Feb 3, 2020

If you meant 706, then I think the original relief was set at 1600psi. Sometimes the reliefs got changed out to raise that closer to 2200-2400 psi.

Jim Shorts · Feb 3, 2020

(quoted from post at 14:16:05 02/03/20) If you meant 706, then I think the original relief was set at 1600psi. Sometimes the reliefs got changed out to raise that closer to 2200-2400 psi.

I m sorry yes the 706. Again very helpful, going to use 2,900psi lines.

Steering Control Valve Upper Seal Kit install

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