Having some lowering issues with our 105.  When turning at the end of the feild and wanting to drop what ever may be attached a the time (planter, disk....)  the hyd seem to stick in the up position.  Sometimes its one time in a few hours and others every round its sticking.  Seems to help sometimes if you idle it down when this happens but nothing seems to fix it. Is this a sticking valve coupler bad, filter?   Throw out some ideas for me.  Thanks in advance