![]() They are cup-shaped and seal the piston rod from the rest of the cylinder. Top Hydraulics replaces and upgrades ALL seals in the cylinders with our superior proprietary material:ġ) Rod seals. What fails most frequently, are the other seals, which have special shapes for proper function. Every R129 cylinder has one o-ring, and those rarely ever fail. Rebuilding these cylinders is NOT a matter of changing o-rings. (The left tonneau cover lock was omitted after 1996.) The original seals in the hydraulic cylinders, aka rams or actuators, will eventually fail in every R129, unless it gets wrecked prematurely, even if you never drive the car or have never used the top before. Model years 1990-1996 have twelve hydraulic cylinders, while 1997-2002 models have eleven hydraulic cylinders that move and lock the roadster soft top. We have two order methods: Either you send in your cylinders first, or choose to "Order now with Core Exchange". Note also our rebuild service for hydraulic valve blocks, distributors, and pumps, as well as manufacture new, superior hydraulic hoses.ĭIY cylinder rebuild will usually lead to unintended damage - we have seen thousands of ruined cylinders from failed DIY repair attempts! ![]() ![]() Top Hydraulics' cylinder rebuild service is widely known as the best possible option, even if you are an excellent Do-It-Yourselfer. Rebuild/Upgrade Service for convertible top hydraulic components on Mercedes R129 models 280SL, 300SL, 500SL, 600SL, S元20, SL500, SL60, SL600, SL73. Mercedes Benz R129 SL-Class | Model Years 1990 - 2002
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