I have a L2900 w La480. It has an electric 3rd valve that used to control a snow plow left/right movement. Tractor has 1,000hrs. Shes old but runs well.
My problem is when I go to raise the loader, it will drop slowly until pressure kicks in and it starts going up. When I'm holding something a few hundred pounds it will very slowly drop, maybe an inch in 2-3min. I've had all 4 cylinders rebuilt for small leaks and possibly this issue. Still happens.. so I went ahead and rebuilt the control valve on my own. The bucket is much smoother at this point (not nearly as jerky/sensitive) however the drop before going up is 1000x worse. With no load, if I go to raise the bucket slowly moving the lever, the bucket will drop like there is nothing holding pressure before pressure kicks in and it starts raising.
I didn't notice the problem before with bucket curl, but it's happening there as well. If the curl is 1/2 way and I go to curl up, the bucket uncurls fast like there is no holding pressure and then starts curling up if I move the lever far enough.
Is there a check valve somewhere? I can hear fluid movement in the control valve when the loader starts falling and after I've opened enough (pulled down on lever) I can hear the pressure build and push loader up. Two distinct sounds when the loader falls vs moving up. What would allow it to open and fall when pressure to push cylinders it not activated?
To review, when I slowly pull control lever down to raise the bucket, it will start falling fast until I move the lever enough to allow pressure through to push the loader up. It used to do this a little, but then I rebuilt the control valve and instead of dropping a little/slowly, now it's almost in free fall when when I start to raise the bucket.
Thanks for some insight!
My problem is when I go to raise the loader, it will drop slowly until pressure kicks in and it starts going up. When I'm holding something a few hundred pounds it will very slowly drop, maybe an inch in 2-3min. I've had all 4 cylinders rebuilt for small leaks and possibly this issue. Still happens.. so I went ahead and rebuilt the control valve on my own. The bucket is much smoother at this point (not nearly as jerky/sensitive) however the drop before going up is 1000x worse. With no load, if I go to raise the bucket slowly moving the lever, the bucket will drop like there is nothing holding pressure before pressure kicks in and it starts raising.
I didn't notice the problem before with bucket curl, but it's happening there as well. If the curl is 1/2 way and I go to curl up, the bucket uncurls fast like there is no holding pressure and then starts curling up if I move the lever far enough.
Is there a check valve somewhere? I can hear fluid movement in the control valve when the loader starts falling and after I've opened enough (pulled down on lever) I can hear the pressure build and push loader up. Two distinct sounds when the loader falls vs moving up. What would allow it to open and fall when pressure to push cylinders it not activated?
To review, when I slowly pull control lever down to raise the bucket, it will start falling fast until I move the lever enough to allow pressure through to push the loader up. It used to do this a little, but then I rebuilt the control valve and instead of dropping a little/slowly, now it's almost in free fall when when I start to raise the bucket.
Thanks for some insight!
