I have a JD 790 with 419 loader. Ever since the tractor was new, the loader (both lift and curl) has leaked down at what I call an unacceptable rate. The more weight that is in the bucket (it leaks down empty too), the faster the leak down. With a loaded bucket, you can physically watch it go down. Even with an empty bucket, it goes down several inches every 10 minutes. I have had it to the dealer three times for this issue. They have been great working with me, but the issue is not corrected and neither they nor me know what else to do. They have replaced all of the cylinders as well as the SCV valve. What could be causing this? What is my recourse? Is there something that could be added (perhaps a check valve) to prevent the leak down? This is an annoying problem as well as potentially dangerous. My own thoughts are that the SCV valve is produced with sloppy tolerances, but that is only a guess. I'm not very well-versed on hydraulics, so I'm seeking input from you gearheads out there that know JDs well. This problem occurs both when the tractor is running and when it is shut off.
Any help would be greatly appreciated.
Thanks.
Any help would be greatly appreciated.
Thanks.