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  1. M

    M51 Power Steering Issue

    Read the other thread, it was helpful, Hit the gearbox a few times, no luck Had some type of red hydraulic oil in the reservoir, drained it and the gearbox oil, replaced both with 10w hydraulic oil from NAPA, no luck next I guess is a pressure test of the pump. Any idea on the pressure value...
  2. M

    M51 Power Steering Issue

    Thanks l’ll have a look
  3. M

    M51 Power Steering Issue

    I should be able to pull off a pressure test will have to ask a buddy if he has one that will hook up.. that diverted valve is interesting. I’ll try the old Korean War trick and hit the gearbox with a hammer “ gently “ if the valve is sticking that might do the trick. Thanks, I’ll try tomorrow
  4. M

    M51 Power Steering Issue

    Have what I think is a 1968 M51 dump truck, The power steering is not working what I can tell you is the reservoir is full I disconnected the supply line that goes from the pump to the steering gearbox, turned the engine over and had fluid come out ( pump is doing something) Sometimes when...
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