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  1. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    I started to clean out the gear box, using straight diesel and small paint brushes. Lot of stuff came out. Also took off the power cylinder. The connection to the gearbox did not look that great (left) compared with the one from the original box (right). Inside and the higher...
  2. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Got a new used Ross steering gear. On the truck, it moved very smooth. About a month ago, some idiots loosened the return hose (return to oil reservoir) on the control valve assembly and left it open, so it got rusted a bit inside. When back in the Czech Republic, and taking off the steering...
  3. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    I did not drive this truck more than 75 miles (less than 100 km) between 2010 and 2012, when I made it street legal. Since 2012, I drove with it about 1 (ONE) miles in the meadows. Probably most of the wear had already occurred before I got the truck. I changed the oil shortly after I got...
  4. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Got the steering gear box out and inspected. At left, the box looking inside. The housing for the spline is still attached. At right the housing removed and detail of the splines of the steering shaft. Everything moves very smooth, without obstruction, buttt ..... The stud assembly...
  5. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Next step done. We did not manage yet to remove the steering wheel from the steering shaft or the Pittman arm from its shaft. Did loosened all the bolts so at least I could turn the gear box and take off the power cylinder casing. To my big surprise (and disappointment) I did not see any clear...
  6. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    You know those days that everything just goes perfect, everything falls into its place straight away? ... Well, this was not one of them aua Some of the pieces and slivers of steel I took from the steering gearbox. The lager piece at left looks like a part of a bearing or seal cover about...
  7. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    As starting remark, the system is not leaking oil anywhere, so all outside seals seem to be ok. Started to take down the rest of the steering assembly following TM ...20 and especially TM ..34-2-2, pages 70 to around 150. "Drain the steering gear box". Did anybody ever manage that...
  8. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    The thread includes a lot of good advice, so I will continue here rather than start a new thread. Most important remark: reread your own threads BEFORE you start work again, can help and at least makes you feel less stupid. Since 2014, the truck has not moved much, and the last two years...
  9. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    GA Rally update on steering GA Rally update. Drove around a few blocks on the meadow with the truck. Free play is acceptable, one side turning OK but not great, other side turning really still feels like washboard. I tried to get off the steering wheel with a heavy duty puller but only managed...
  10. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Re-assembled the control valve assembly Put the steering back together again today. Before doing anything I loosened the steering gear box adjusting nut a quarter turn. The pronounced clack is less, but I have a lot of free play in the steering wheel. Still the left turns goes hesitant, right...
  11. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Did a day of shopping and I think/hope I got everything. Tomorrow everything has to be put back and work since the truck has to move 15 feet to make room for some wood for burning. I took the two old hoses connecting the valve assembly to the power cylinder and had new ones made. 10...
  12. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    I found a good larger company specialized in hydraulic stuff. Showed them the valve assembly and the guy there saw no reason to scrap it. He actually had the seals on stock and, very big surprise, even the hose connectors. The seals came to a dollar and twelve cents for all three seals (two...
  13. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Took an hour off and checked on the truck. Took another picture of the mess and then made a nice contraption on our vacuum cleaner to reach those awkward places to clean the area before taking out the two washers. Seeing it the first time, you would not think anything can be taken out of...
  14. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Actually, its only the area around the control housing that is rusty, inside the control valve unit things look very nice to me. If I had the $$ and lived in the Netherlands or the US, I would replace the whole steering unit in one go including gear box and steering shaft. However, I haven't and...
  15. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Did not have time to do some work yet (taking care of my sick grandson), will be Sunday. The TM did needed some deciphering here and I am trying to avoid doing something stupid and maybe messing things up, so just a quick check if you don't mind. Below is the earlier pic of the mess on the...
  16. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    That is what I miss here, somebody to work together with, including the shouting. I used to discuss these things with my brother but he passed away 3 years ago. Let's take this stupid thing one step further. The steering got worse and worse quickly, that is, only a few miles driving but months...
  17. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Thanks, now you mention it, almost did something very stupid here. Turning it would change the positions and the lever would not fit good anymore or be in the wrong position. Is that the problem? A small magnet might help clean the stuff out also.
  18. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    I will clean it and try to get things out, then try turning the wheel (without starting the engine, that would be a nice mess). If the wheel turns smoothly or at least acceptable, I will leave it at that and rebuild the stuff. Now it is loose and clean, taking it apart again is not much of a...
  19. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Swiss, what kind of grease do you use? Doesn't that give problems with the oil? Do you have the Napa number for those rings? I can try to get something fitting here, but I am not sure if I can trust these "no problem, they will fit and are ok" stories here. Cleaning it up probably means...
  20. Robo McDuff

    M51A2 hydraulic power steering problem ross hydrapower

    Taking apart the control valve assembly Might as well find out how the inside of the control valve assembly looks. Took me 20 minutes to get the pin out on which the actuating lever rotates. Not only stuck, but also quite strong rust edges in the spaces between lever and valve house. Read...
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