My propane-burner 4020 and also propane-burner 3010 both have severe, but intermittent, hydraulic fluid leaking problems. I would like to find repair kits and/or tips on how to stop the leaks. My 4020 just recently started leaking in a steady stream from the bottom rock arm shaft, to the extent that I need to repair this before further operating it. I have buckets under it to capture the streaming oil, whether running or not. Both tractors have loaders attached, and the valves and cylinders also are leaking. Has anyone had experience with similar problems and how to obtain and apply repair kits?