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Thanks for the very clear explanations, Piper. I do not notice any jerkiness or odd behavior in the FEL before it quits. I do have a manual for the tractor but not the one that came with it…. destroyed in a garage fire in 2009. So, I do not know exactly where the pressure relief valve is located. I’m pretty sure there is one on the loader at the bottom of the joystick (see attachment just below the rubber boot) but would rather not mess with it as I have read that you should not increase the pressure setting that was set at the factory.
Think I will try what you suggest. First get it to stop working and take the FEL circuit out of the loop. If it still doesn’t work, take a sample of hydraulic fluid from the reservoir to check for air. Glad you told me it probably isn’t the quick disconnects. I guess it could be the fluid too low…. I usually run it low on purpose. I found out if I fill it all the way up on the fill indicator, then it leaks out the breather. The field I bushhog is not flat but is not real hilly either. Maybe after an hour or so, the fluid has had enough time to absorb air and that is when it stops working.
Because (1) I do not use the tractor regularly (only have around 400 hrs. and I bought it in 2005) and (2) it will take around 1 hr. to get it to stop working, I will probably not get around to it immediately. But when I do, I will be sure to follow up here as to my findings. Thanks again!!
Thanks, David and Piper. I’m not very knowledgeable in hydraulics….only know the basics. Just trying to figure out the next steps to take to solve the problem.
To answer your questions: I’m using AW32 fluid here in North Carolina and it has been regularly around 90 degrees here lately when I operate the tractor. I have not checked the fluid for air or loss of viscosity. When the hydraulics stop working, the tractor is hot ( but not overly hot because temp gauge is around 80 degrees centigrade) and the fel control is not too hot to the touch.
I’ve wondered it it could the the quick disconnects? The pump and Koyker joystick would have two of the original Chinese QDs and two Koyker QDs. Was thinking maybe after getting hot the QDs stop functioning and the pressure relief valve kicks in. Would that cause both the fel and the three pt. to stop working? Or could it be something in the hydraulic pump to cause it to stop pumping fluid?
Again, thanks for your advice. I guess the next step would to to run it until the hydraulics stop working and then quickly take off the hydraulic fluid reservoir cover and try to see if air is in it. While in there I would also check the in tank filter for blockage. Appreciate your help!
