If NOS, the seals may need to be replaced. Using a jack lubricates the seals, therefore better for a jack to have periodic usage than sit unused.
what about trying a new, or stronger lowering spring?You have just answered my question about why my 2 1/2 ton Omega (Snap On Sourced) jack will not lower under its own weight.
It lifts and holds, but it will not fall without a nudge to start it moving, despite lubricating the ram, and all the pivot points with Fluid Film.
what about trying a new, or stronger lowering spring?