Brian,I read your message posted in the photo gallery about the Hidraulics of my tractor. There is only one lever in the tractor that actuates in the extreme lower and higer position and as a equilibrium point in the midle . If one holds the lever in the higher postion, the arms lift until it reachs the travel limit or at the point you leave the lever . after that the implement mantain its position. If the lever is forced to the lower position the implement goes completly down unless you are quick enough to bring the lever the higher position which I think is not possible. It works like a simple valve valve that closes in the midle section. A true position control is much easyer and safer to work with. I know a srapeyard that as a rear section of FSM (with disk brakes, larger tyres and, better Hidraulics and .... Handbrake!!)). But I have to think better if it worths the money and the trouble (they are asking about 350 £) and I'm not also sure about the condition of it The hidraulics only works if the PTO is engaged.
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