Humming/vibrating from FEL hydraulics

[kjg26]

I am trying to trouble shoot a strange vibrating/humming sound from one of the loader roll hydraulic lines. I've isolated which line it is but don't know where to go from there.

It was suggested in the hydraulic forum that there may be air in the line and that i should cycle the loader, disconnect the QD and reconnect. Then possible do the same with the loader up in the air. As i'm new to tractors and don't understand how they work entirely it makes me nervous to disconnect a pressure line while the loader is up in the air. If i disconnect one of the curl lines with the loader in the air wont the bucket flop forward? Or do i place the bucket into that position prior to disconnecting

 

[Billrog]

I wouldn't be disconnecting anything with the loader up in the air. If there's air in the line the bucket would react jerky also with a couple of cycles the air would be perched. Possibly the inside of the hose delaminating but then again maybe it is a bad connection on the quick coupler sucking air ?

 

[K5lwq]

I would not worry to much over this. Since you only get the humming on curl down, and I assume no other performance issue, I would just use it till something else tells you that the problem is a problem. Who knows, it could have been doing this since it was new.

My valve has a issue of blowing over the relief when lowering the boom. All other functions are fine. Until I can locate a better valve, if there is such a thing anymore, I will just deal with it.

 

[kjg26]

So I went out there today. Tractor fired up and ran beautifully with no noises. Ran it for 4 hours doing some brush hog work. When to put it away and moved the bucket down and was having the noise again. So it seems to me it's only happening once it is warmed up.