Re: hydraulic cylinder rebuilding questions

Posted by Gene Davis on March 31, 2002 at 18:58:40 from (63.160.130.97):

In Reply to: hydraulic cylinder rebuilding questions posted by Dave on March 31, 2002 at 18:32:27:

Sounds like you have a control valve internal leak, You can test cylinders by extending the cylinder to the maximum travel, support it then plug the oil ports to the cylinder on both ends, then when you take the support away,( best to support from above so you don't have to work under it), if the cylinder is bypassing it will go all the way down,if it is not bypassing, it will sag some then stop. A cylinder that is bypassing will usually be hotter than the others if it is bypassing much. Be very careful when preforming these tests, hydrualic oil can be blown under the skin sometimes under pressure and as always you need to be sure of your support's ability to hold the load and remember that when you open a hydrualic line, always work the control valve to relieve the pressure. Hydrualic oil will always expand to at least 100 times more volume outside the system once you start working with it so expect oil everywhere, and remember that dirt,and trash kill a hydrualic system very quickly, so have every thing ready to use when you open it and keep it clean, and use goggles when opening a line. Safety and cleanliness on this type of work should be the first concern! Gene Davis

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