Question about Farmall IH Tractor 706, 756, 806, 856, 1206, ITIH32

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We have a 1970 1256 IH tractor that has lost all steering, brakes, and motion (forward and reverse).We put a pressure gage in the port on the multiple control valve and it showed zero on the gage. We drained the oil and visually checked that the pump gear was good and when we bumped the starter it was turning. All seemed ok so we put a new pump on. With the oil topped off we tried it again and still the gage reads zero.It acts like the pump isn't getting any oil. We also changed the hydraulic filter. Not sure which direction to go next. Any help would be greatly apprieciated.

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  • cha210 Mar 11, 2011

    The pump is lower than the oil level, the port that the pressure gage is in is where the manual says to put it. the book calls for an operating pressure between 1800-1900 psi. If less than that it says to replace pressure relief valve. We can't get any oil out of the pressure relief hole with the pressure relief valve removed.

  • cha210 Mar 11, 2011

    We removed the relief valve completely and left the hole open and don't even get a drop of oil to come out

  • cha210 Mar 11, 2011

    Yes that is exactly right, but we figured it out. The only thing we can come up with is it was air locked. We took the multiple control valve (MCV) off again and removed the pump off the plate and when we looked inside the pump it was dry. We remounted the pump to the MCV and poured some oil into the suction side of the pump and turned the gear by hand untill we had oil coming out of the pressure outlet hole(where we had the pressure gage). We reinstalled the MCV to the tractor, topped off the oil again and started the tractor. At first we didn't have any pressure on the gage and then we loosened the fitting on the gage and we got some air and then oil and then the pressure started to build to specs. at the end we had about 1700 psi. Steering works, brakes work and so does forward and reverse. So all we can come up with is it was air locked and without some oil in the pump to fill the air space around the gears in the pump it was just spinning and the oil didn't have enough head pressure to gravity feed to the pump. Hope this all makes sense, in the end we did get it to work, and we thank you for trying to help. Thanks again, Charlie

  • cha210 Mar 12, 2011

    We ended up taking the pump off and pouring oil into the suction hole and turning the pump by hand. An air lock seemed to be the problem.



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Ensure that the port you use on the multi control valve is in the inlet port passage of the valve.
If your reservoir is lower than your pump, the pump will have to be primed. Try see into the reservoir if there is any flow of fluid when the pump is operating. One of the main causes of lack of pressure in a hydraulic system is a failed pressure relief valve. Check if there is a free flow out of the return port of the valve with the engine and pump running, there should only be a relief flow out of it - try fit the gauge to the inlet side of the valve and observe the pressure there. You can rule out the filter as a problem area.
I am not familiar with your specific hydraulic system but am conversant with much larger and more complex systems. Is it possible to isolate everything in the system bar the reservoir, the pump and the relief valve and a gauge? If you can and it builds up pressure, then you can start including systems until you are without pressure again and this will pinpoint your problem component. Alternatively, isolate systems one at a time (not the relief valve) and try locate your problem this way. I believe your system pressure should be 1600 psi.
Please come back to me with any findings or if you need more information.

Posted on Mar 11, 2011

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  • Hans Pearson
    Hans Pearson Mar 11, 2011

    Can you put your pressure gauge on the outlet of the relief valve, cutting out the whole hydraulic system to see if you have pressure there?

  • Hans Pearson
    Hans Pearson Mar 11, 2011

    You mean that you are not getting any delivery from the pump at all, yet is is a new pump and you see the gears moving. Is it possible to connect the pipes the wrong way around on the pump? If it is a gear pump, the normal type with two inter meshing gears, the gears carry the oil around the outside in the tooth pockets and the meshing teeth force the oil out of the outlet ie. if the inlet is say, at the bottom and the outlet at the top and you are looking down on the gears, the left one would be turning clockwise and the right one would be turning counter-clockwise. Come back to me with any further information.

  • Hans Pearson
    Hans Pearson Mar 12, 2011

    Glad that you worked it out and sorry for the long delay, it turned into night here and bedtime. The reason I asked about the location of the reservoir to the pump was for the purpose of priming the pump on start-up. Well done any way. Regards, HANS


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On rear of mcv valve will be a plug that uses a5/8 wrench [only one that size] remove it completly start tractor (this is going to make a mess)see if oil sprays out of valve body if it does put plug back steering ta and brakes should work

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Try putting oil down the pressure relief valve hole, just in case the pump is air locked, we have even used a electric fuel pump to help prime the pump before. also prime the filter before you put it on.

let me know how it works out.

Posted on Mar 12, 2011

  • john nail
    john nail Mar 12, 2011

    good for you those air locks can be a pain.


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