help on Kubota hydraulic

[Micg]

hello all,
I have a Kubota L1-18 which was working fine until suddenly it did not lift the 3 Point impliment arms.

If you lift them by hand they stay in their position and also lowers when the control lever is lowered. Leaving the tractor with the impliment arms raised overnight, with the rotary mounted, they still hold high. So I am assuming that internal seals are OK

The main hydraulic pump was replaced from another similar tractor, still resualted in no lifting of the arms.

Anybody can help me to solve this problem??
Thanks in advance

 

[lens12]

Did you check to see if the pickup screen or hydraulic filter is clean.

 

[Micg]

hi Lens12,
Thanks for your feedback. This model does not have a pick up screen but a hydraulic filter ontop of the hydraulic pump. The filter has been replaced first thing.

The last job i was doing whilst the trouble occured was using the plough. I used the control lever several times to raise & lower the plough, so the problem may be in the internal leverage of this control?

Any more help is highly appreciated - regards
Micg

 

[lens12]

Filter was replaced after problem occurred? Crack pressure line to see if pump is pumping any oil.

 

[Don5283]

That happened to me today, I changed the filter, checked the pump for flow and pressure, cleaned the check valve, nothing I did helped about to give up and take the lift cylinder and control valve off to check them out. Thinking that it must be some thing stuck, I lifted the arms and slamed then back down, partly as a test and partly out of frustration. But it worked, the lift arms work fine now. I belive that some how or some thing got the control valve stuck. Good luck. Don