Been very busy with my F22D....I used the FEL to clear snow back in winter and now Spring is here all has been well using the GEO TL rotary tiller/rotovator, did a big field for a friend and my own patch.....but now I have come to use the mower again all works but the 3 point linkage is dropping unless the tractor engine is running quite fast and it is slow to pick up, cold or warm. (on tickover the 3 point slowly drops) I have tried to make a diffference with subtle adjustment of the drop valve (below the front of the seat) but can make no difference. The mower is a heavy GEO AGL 125 swing out flail mower (more of a mulcher than a mower it destroys the grass!!) it is a very versatile piece of kit but I wonder if it is at the limit of an F22Ds capability. I have had a look at the filter which looks new (so if it was actually new when supplied as I was told it was - it is a Japanese filter CAPA by make) but obviously now has two summers use on it. The transmission oil is ATF and looks fairly clean (should it be ATF??? and can I change it to a more usual Hydraulic fluid?) So what can I do to sort out this dropping problem? After a hard days use with the tiller it will drop slowly but with the heavier mower it creaks its way down in a minute or two. (I can stop it by locking off the valve but even if I open it a tiny bit the linkage will drop as soon as the engine is on tickover or stopped). Note: FEL is fine and does drop slightly, but over weeks not seconds. Also Note: towards the end of last year when mowing the 3 point had a bit of a slight 'bounce' to it when warmed up and lifting/carrying the mower....this 'bounce' has gone to be replaced by the 'dropping' effect. Help and advice will be welcomed gladly especially about whether I should be on ATF or something else in the trans.