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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?
on my 504a foton there is a rubber grommet to the rear of the gear shifter about 2 1/2 inches in dia. take it out you will see the fill plug there,I can not remember if there is a oil level plug in the side of the trans. case or not. but I assume so.
first you need to determine if the pump is not feed from the engine , my foton 504 gets oil from the engine. there are oil lines that come from the rear of the oil filter housing going to the pump.
