Guys .... several comments . Most every town/city has someone who can repair jacks ... look in the Yellow pages under Hydraulics , Jack repair . Also , someone mentioned that they used a heavier fluid and that solved the problem . I just retired after 30 years in the Hydraulics Industry .... be very careful on this as the heavier fluid just masks the original problem , which is probably bad/worn piston seals or a scored bore . The jack could come down when you least want it to .
Getting seals and doing it yourself is indeed an option as I have done that myself . Just make sure to check the bore for scratches/scores and don`t damage the seals during installation .
Another potential problem is the holding valve may have some bypass through it .... either from dirt on the seat or just plane worn out . Either way , that can be repaired/replaced also .
However , one thing to keep in mind is that a lot of the newer jacks are made "offshore " and are nowhere near the quality of the older American made equipment .
