L5030 3 point hitch / hydraulics malfunction

[Ngp]

Help please.... I have a Kubota L5030 GST. The hydraulic fluid is topped off and was changed approx 350 hours ago. I took off my backhoe after working both the backhoe and front loader without any problems for a few hours. I removed by backhoe, installed the 3 point hitch and my brush-hog. For approximately 2 hours there were no issues. Suddenly I noticed that the brush-hog was riding low and I reached down to lift it slightly. Nothing. I tried lift the 3 point hitch over and over without success. I then disconnected the left and right arms of the hitch from the piston to see if the piston would rise on its own - nothing. I manually lifted the piston while the lever was in the up position and the pistons dropped like lead weights as soon as I let them go. They were not getting any pressure.

Then I notice that the front loader was not working properly. It would not go up or down when in the lever was in the neutral or center position. If I moved the lever to the right or left and simultaneously lifted or dropped the front bucket - it would work. The front loader has stopped working in the neutral position unless you force it to release all pressure by extending the lever away from you all the way.

I inspected the entire tractor and found no leaks. Any ideas. You help is appreciated much......... Nick P

 

[North Idaho Wolfman]

Try operating the loader and at the same time as the three point and see if that does anything.

 

[tthorkil]

http://www.tractorbynet.com/forums/...backhoe-pictorial-tutorial-removing-bh90.html
Did you perform step 11 in the tutorial above?

 

[Ngp]

Dear Wolfman, Yes I tried lowering and lifting the 3 pt hitch while operating and moving the loader hoping maybe there was air in the line or something like that..... no luck. I also tried today again think after the hydraulic fluid cools it will change the dynamics. No Luck. Any advise or ideas are welcome. Thanks. Nick P

 

[Ngp]

Dear tthorkil, Yes I did hook up the outlet hose to the return properly. I also checked that there were no leaks. Everything was working well for about 2 hours. Any other recommendations would be appreciated. I can not think why both the loader and the lifters (piston) on the 3 point hitch would go out at the same time. THanks Nick P

 

[North Idaho Wolfman]

It's sounding like a bypass, relief valve or pump problem.
I think you next step is to get a pressure gauge and start testing pump and beyond pressures.