Actually, the check valve issue was in 2006, I remember because I had to replace mine at the time. Go to the old forums and do a search for the thread “Broken Plastic check valves in the Hydraulic filter” in August of 2006 – there is a ton, pages and pages, with pictures and part numbers, of info. Northern Tool and TSC (and many other places, I'm sure) have direct bolt on replacements, and not that expensive.