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Thanks Dave, I had previously done a lot of modifications on this hoe. I detailed one on CTOA for fixing the issue of the how lifting when pressing down with the bucket which worked great,but it since had disappeared from the site. One of the mods was probably similar to you, I installed a screw-on filter. However over the years it has occasionally had to stay outside and have only changed the fluid in about 2011 so I see some proof of water inside of this cylinder which is no bueno!
An odd thing is that when I took the cylinder apart the C cup seal seemed to me to be in backwards! I took a picture when I removed it. Perhaps I am backwards but pretty sure that the “open” or lip side of the seal is supposed to face the pressure or fluid side so the pressure helps push the seal against the wall of the cylinder. I might pull out the second cylinder to check if that one is in the same direction as the whole syy seems to need flushing anyhow.
thanks for well written answers.
It is a swing cylinder for a JW-03 backhow. ( Not a 3 point hoe, frame mounted) After I got into it, it was pretty easy to remove and take apart. Neither Affordable or Circle G have the parts or cylinders but they were quick to reply. Main part mine needs a 40mmx50mmx8mm seal. Easy to find it seems. There was a pile of contaminants in these so I may have a big job flushing it all.
( For anyone searching down the road; swing boom away, strap it for safety. Remove the 2 bolts on each side which are partially blocked by the inboard attachments of the stabilizer legs. Lift bracket above both HYD cylinders up a couple inch, pull cylinder to the rear and undo the single line.
Here is my issue. Perhaps different from yours.
You may have a bigger issue. I eventually had to replace my injector pump. It started with fuel leaking out what I assume was an overflow on the injector pump. (brass colour.) It did last about 30 hours with it leaking though.
Thanks piper for taking the time to answer with all your info. I will do an oil change today.
Thanks piper184. That does séem to make sense. I will give a shot at draining and refilling with oil.
Are you meaning that when the lift pump wears or fails it will leak fuel into the crankcase of the pump?
If you drained the fluid and rebuilt pump, a few options…. 1. You did wait a bit when engine running, it takes 15 or 20 seconds on mine to fill the FEL cylinders and start them living and quite a few cycles to get rid of the air.
2. Does your pump have a bypass? My FEL valve came adjusted so low that it did not even lift the bucket. ( I then tightened it up nice so that I then popped HYD lines like candy! After a while I found the sweet spot.) If it has a bypass, did you back it off or not assemble that part quite right?
3. Is there a leak on the inlet side of the pump. That would cause issues.
As someone else mentioned, perhaps loosen the pump outlet a touch and see if there is any increase, problem though is that to increase the preassup for the leak to increase you pretty much have to pressurize ( fill) the whole system.
My Jinma is like piper184 said, 3 pt won’t lift until warmed a bit, but my other hydraulic functions work well when cold.
Is it possible whatever shaft turns your pump is broken. Seems possible if bush hog was stopped suddenly. ( I don’t know if it was running off of this pump, mine runs off of the rear PTO.
