A couple of years ago I started a short thread on my Bolens Sundstrand series 15 hydro rebuild. A couple of you responded and offered good help. I see that Bill Petenpole has also posted an excellent and detailed rebuild guide on this site - I may need to use it.
A few years ago I rebuilt my hydro, but it only ran well for one season. After that I sent it to LJ Fluid Power in Delton MI for a rebuild. They had rebuilt it once before. This time it only ran another 120 hours or so. I hesitate to spend the big bucks to have a rebuild done again, but on the other hand hate to put my old Bolens QS16 out to pasture. I have rebuilt virtually every component on this tractor, and even the K341 engine only has about 300 hours use.
With such short periods before going out, I'm wondering if I am somehow getting contamination into the hydro from my differential (wear particles?) or attached mower lift hydraulic cylinder. Has anyone had any success in flushing the fluid a couple of times, in case I only have a clog somewhere? My free wheeling valve was in good shape with the last rebuild, but I plan to check that again to make sure. I don't have any noticeable leaks.