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when you have the starter out take a flashlight and look at the ring gear. If your tractor has a compression release wire it open and have someone else turn the crank to inspect whole ring gear. If no compression release you can pull glow plugs or injectors or be very very careful turning engine over with the fuel cut off (engine stop) fully engaged.
I took some instructions to a Chinese restaurant and had one of the girls there help me out with what it said . good luck what you have there is quite confusing.
pulling the pto guard is not the end of the world project just put the bolts back in and your good to go, it is just the bolts have two functions, hold the shaft in place and hold the guard in place. so put the bolts back in place.
just as a bit of almost useless knowledge the old john deere model g used 30 wt engine oil in the hydro. rear 4 point lift systems. I think the idea was one oil for everything.
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.
