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  1. #1
    Senior Member robbie956xl's Avatar
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    Stiff steering International 956XL.

    I have an International 956XL "B" reg, Red and cream colour scheme. The tractor is in great order for it's age, has 6700 hours which I cannot verify of course, as I bought her many years ago from a small time dealer. The power steering becomes very slow/stiff when the engine RPM is low, and the hotter the weather/engine the stiffer the steering becomes. When I bought the tractor, it was like this, and I mentioned this to the seller and he aggreed with me that there was something amiss, but he also told me that a brand new hydraulic pump had been fitted, and no improvement had occurred to the steering. I do not disbelieve the sellers story as the pump certainly appeared new to me. The other hydraulic functions all work exceptionally well even at tickover speeds. I use this tractor to operate a hydraulic boat trailer moving motor cruisers up to 20 tons in weight. There is a small leak from the orbital unit behind the dashboard, and someone has made a little funnell arrangement so that this small leakage drains to an old brake fluid bottle rather than dripping over the foot pedals and cab mat. I can live with the tractor as it is, but I would also like to have it operate as it should do if it is not too involved expence wise. Perhaps some forumites have experience of what is the likely cause of the trouble.

  2. #2
    Senior Member Gapples's Avatar
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    Re: Stiff steering International 956XL.

    The way you describe it it sounds very like the pump, but its a dual pump & they wear out as a pair too.
    There is a priority flow divider which is worth a look at & have the steering rv preasure tested.

  3. #3
    Senior Member robbie956xl's Avatar
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    Re: Stiff steering International 956XL.

    Quote Originally Posted by Gapples View Post
    The way you describe it it sounds very like the pump, but its a dual pump & they wear out as a pair too.
    There is a priority flow divider which is worth a look at & have the steering rv preasure tested.
    Thank you for reply "Gapples"

    Not sure what exactly you mean when you say "Its a dual pump and they wear out as a pair too", Also, the priority flow divider, how can this be checked ?. Sorry, but I do not understand what the "steering rv" is ?.

  4. #4
    Senior Member Gapples's Avatar
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    Re: Stiff steering International 956XL.

    The dual pump means that the main hydraulic pump & the steering pump are bolted together, in this case on the r/h/s of the engine & have a common oil supply, one does not wear out without the other.
    The rv is the relief valve, the steering rv is in the obitrol, the steering unit that you turn with the steering wheel.
    The flow divider is either on the right side of the engine beind the dual pump or just behind the engine above the clutch housing.
    You have to strip it & check its clean plus moves freely.

  5. #5
    Senior Member robbie956xl's Avatar
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    Re: Stiff steering International 956XL.

    Thank you for quick reply Gapples.

    So is it possible that the pump which serves the power steering is faulty and the one which serves the hydraulic lift/spool valves is good, or is that not possible because as you say, both pumps fail together at the same time. The other hydraulic functions on my tractor are perfect.

    Can I simply swap the orbitol unit in my tractor for another one or do they have to be zeroed in or timed or whatever ?.

  6. #6
    Senior Member Gapples's Avatar
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    Re: Stiff steering International 956XL.

    Both pumps draw the same oil & come as one unit anyway. I've only ever fitted a dual pump, you say the hydraulics work ok but I would still suggest having a flow test done as unless you are doing serious hydraulic work the power steering may well be where you feel a failing pump at first.
    Yes you can simply change over a steering unit for one off the same tractor, no timing to do unless you strip them down.

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