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Message: <blockquote data-quote="Mike10" data-source="post: 46368" data-attributes="member: 5461">Locate a cap and plug the same size as the line that attaches to the control valve.  Lower the bucket to the ground so it is flat on the ground.  Remove the line, which goes to the rod end of the cylinder, from the control valve and use the plug to plug it and the cap to cap the control valve.  Raise the boom and see if the bucket leaks off.  If it does the problem is in the cylinders, if not the problem is in the control valve.    One exception would be if you have a hydraulic face plate.  The bucket can bleed off through this valve.I have seen cylinders that were supposedly rebuilt but the parts used were not original equipment parts and they failed after only a few hours.  The new piston seals are probably different from those that came out with the loader.  It is a three piece seal and the two side rings must be installed correctly.</blockquote>