hydraulics on a david brown 950 implematic?

does anybody have an idiots guide on how to bleed, top up, and service the hydraulics on my newly purchased d.b.950 implematic. at the moment it litfs the three point linkage sloooowly and then even slower goes back to its lowest point by its self but if you try to lower it with the control lever ,no matter how slow you try to do it, it comes down quicker than my exs knickers.Can somebody please help (with the tractor not my ex)