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  • kgwedi commented on kgwedi's instructable Prosthetic Knee Oil Change
    Prosthetic Knee Oil Change

    I have one knee off e-bay that leaks out of that small hole in the top. I think "maybe" all hydraulic systems need a pressure relief valve in case the pressure gets to high. Maybe that is what happened. I was walking to the shops on that knee when all of a sudden it went floppy with no resistance, and oil was everywhere. The culprit was that small hole.I could not stop that leak. My guess was that a one time relief part, relieved the pressure by allowing it to escape through that hole. Sort of like a fuse.I am sorry that I can not share more information. Fortunately I have other 2100 knees, and so I don't need that one. If I "had" to fix it, I would put a small sheet metal screw into the hole with epoxy, to seal it shut. Of course that would defeat the purpose of a re…

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    I have one knee off e-bay that leaks out of that small hole in the top. I think "maybe" all hydraulic systems need a pressure relief valve in case the pressure gets to high. Maybe that is what happened. I was walking to the shops on that knee when all of a sudden it went floppy with no resistance, and oil was everywhere. The culprit was that small hole.I could not stop that leak. My guess was that a one time relief part, relieved the pressure by allowing it to escape through that hole. Sort of like a fuse.I am sorry that I can not share more information. Fortunately I have other 2100 knees, and so I don't need that one. If I "had" to fix it, I would put a small sheet metal screw into the hole with epoxy, to seal it shut. Of course that would defeat the purpose of a relief valve, but maybe it would make the knee usable again as long as the pressure never got to high.I wish I knew what to tell you....

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  • kgwedi commented on kgwedi's instructable Prosthetic Knee Oil Change
    Prosthetic Knee Oil Change

    I don't know why water should cause a leak. Maybe sea water with sand in it?The bearings are garden variety roller bearings. Available at just about any bearing store. I used normal muliti-purpose grease from Home Depot. You will need a grease gun, and 2 special grease nipples (fittings) for the grease gun. I got the fittings from an industrial supply store. I showed them the knee, and they knew exactly what grease nipples were needed.Just pump the grease in to get all that WD-40 out, and then clean up the mess. I think I way over greased mine. Mine continued to leak grease for weeks from the bearings. I got grease all over anything my knee touched.The reason a thicker or thinner grease does not matter to the swing rates, is because you adjust those anyway. So a thicker grease can be coun…

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    I don't know why water should cause a leak. Maybe sea water with sand in it?The bearings are garden variety roller bearings. Available at just about any bearing store. I used normal muliti-purpose grease from Home Depot. You will need a grease gun, and 2 special grease nipples (fittings) for the grease gun. I got the fittings from an industrial supply store. I showed them the knee, and they knew exactly what grease nipples were needed.Just pump the grease in to get all that WD-40 out, and then clean up the mess. I think I way over greased mine. Mine continued to leak grease for weeks from the bearings. I got grease all over anything my knee touched.The reason a thicker or thinner grease does not matter to the swing rates, is because you adjust those anyway. So a thicker grease can be countered by lowering the extension or flexion resistance.

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  • kgwedi commented on kgwedi's instructable Prosthetic Knee Oil Change
    Prosthetic Knee Oil Change

    I wish you good luck on fixing your 2100. Before opening it up, I would check very well, and be sure where the leak is coming from exactly. Maybe clean real good with water and paper towels, then baby powder all over? If leak is coming from one of the shafts, then it is beyond my knowledge. Most probable leak site will be from one of the adjustment screws.I would use RC model car shock absorber silicon oil of 150 CTS viscosity. I have rebuilt another 2100 after doing this instructable, and that worked perfect for me. In the real world, there is very little difference between 150 CTS and 450 CTS as far as the knee goes. I walked on a knee with 100 CTS, and I walked on a knee with 450 CTS. I will use 150 in the future. FYI: I have also overhauled 2 College Park K2 hydraulic ankles. I ended …

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    I wish you good luck on fixing your 2100. Before opening it up, I would check very well, and be sure where the leak is coming from exactly. Maybe clean real good with water and paper towels, then baby powder all over? If leak is coming from one of the shafts, then it is beyond my knowledge. Most probable leak site will be from one of the adjustment screws.I would use RC model car shock absorber silicon oil of 150 CTS viscosity. I have rebuilt another 2100 after doing this instructable, and that worked perfect for me. In the real world, there is very little difference between 150 CTS and 450 CTS as far as the knee goes. I walked on a knee with 100 CTS, and I walked on a knee with 450 CTS. I will use 150 in the future. FYI: I have also overhauled 2 College Park K2 hydraulic ankles. I ended up using 150 CTS in those also.The last 2100 I did, I filled a 10 ml syringe with 150 CTS oil and almost used it all. Maybe 9.5 ml. It depends on how much old oil you get out, and how full the air chamber is on refilling.

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  • Prosthetic Hydraulic Ankle Repair

    I am afraid that I can't help you much with the o'rings used. I have an o'ring store nearby, and they didn't bat an eye when I showed them the o'rings and seal. They just handed them to me. Total cost was under a $, so they just told me to leave. I got another K2 on E-bay, and it also leaked. I again went to the same store, and they still had the seal and o'rings. They charged me about $2.00 this time. I live in South Africa, so I would expect a USA store to also have the seal and o'rings if we have them here. I never had to get serious and find sizes or part numbers for them..Sorry.

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