Mechanos
Veteran Member
Cleaned the #100 screen. There was a minimal amount of debris. But well worth the effort to inspect and clean. Replaced hydraulic fluid at same time. If I turn off the rate of descent valve for the 3 pt hitch under the seat the surging stops. With the valve open the surging is still present. If there is a little weight there is a little surging. More weight more surge. I have no oil being produced by way of a leak.
If you close the rate of drop valve completely with the engine running, you put the hydraulic system into relief (forcing the relief valve to open as the only path for hydraulic fluid to flow). You should hear the engine load increase when you do this and it should not be run for long in that position. The leak refered to is an internal leak... you would not see any oil leaking onto the ground.