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Thread: MF 390 problem turning right.

  1. #1
    Junior Member
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    Jan 2014
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    Galway , Ireland
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    MF 390 problem turning right.

    My brother has a MF 390T 4WD (1989) and it has begun to have a problem turning to the right.
    It used to happen occasionally but is now happening more often.
    The problem is that when turning right the steering (sometimes) won't turn unless there is a good rev on the engine. Slowing down as you turn right can mean you can't turn right ; revving the engine a bit , there is a knock and then the steering will turn. It's as if the increased rev enables the power steering to overcome whatever is preventing the right turn.
    Turning to the left is never a problem - regardless of engine speed.
    Have been looking for some info on the 390 steering system but not much luck so far.
    Any ideas/suggestions appreciated.

  2. #2
    Senior Member Footsfitter's Avatar
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    Feb 2013
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    Re: MF 390 problem turning right.

    Quote Originally Posted by dooroy View Post
    My brother has a MF 390T 4WD (1989) and it has begun to have a problem turning to the right.
    It used to happen occasionally but is now happening more often.
    The problem is that when turning right the steering (sometimes) won't turn unless there is a good rev on the engine. Slowing down as you turn right can mean you can't turn right ; revving the engine a bit , there is a knock and then the steering will turn. It's as if the increased rev enables the power steering to overcome whatever is preventing the right turn.
    Turning to the left is never a problem - regardless of engine speed.
    Have been looking for some info on the 390 steering system but not much luck so far.
    Any ideas/suggestions appreciated.
    One or two rams? easier to track down if its one. I'd be looking at the seals/piston in the ram(s) sounds like oil is passing by a damaged seal or loose piston on its rod. The action of revving up making the fault disappear could be increasing the oil flow and pushing back/seating what ever is letting oil by? Check your ram(s) first and if all ok then there is a possibility the orbital steering motor may have a fault or even a daft as a bit of seal/oring floating around causing problems?

    Rams first and rule them out.
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