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these tractor manf's are not loyal to any engine manf. as best as I know you could have anything on there, all I can tell you my 2006 foton 504a has a quanchi, look over the engine well there might be two tags. Maybe one on top of the valve cover , I can not remember.
old fart 2 is right if you have those quick connects it would be a good idea to work them out of the system . I would suggest pioneer brand fittings.
I do not know what the cycle rate would be but the psi I believe should be in the 2000 psi range. I have read on older posts that people have had good luck with changing out the valve bodies with different than stock ones, better flow and control . As far as ruling out the only suggestion I have is to take the old one apart to visually check for a defect or restriction.
I think you uncovered that adjuster link for the clutch ,you could stick some wire in there to the bottom see if there is oil but I would think it should be dry , I think your in the bell housing.
I guess it could be 3 things pump ,valve body and lift and curl cylinders. I am guessing it would have to be pump or valve body , more so than the cylinders. but that is just a guess.
sometimes you just gotta do what just has to be done, but I do not know if I wouldda done that with a auto ,stick most likely
it might be a good idea to place a pressure gauge in the system to see if the pump is making enough pressure. Let me ask you this is just the lift slow? How about the bucket curling action ,slow also?
look for filters and screens. is all of your other hydro functions ok?does that have its own pump?
