John Deere 3350A front loader hydraulics problem

[Tractortech]

I can't find any information in the Tech manual regarding the return oil flow I'm afraid.
You may as well return all the oil to the rockshaft. If you can't get the loader to return into the low pressure, it may be a bit slow as it'll rely on the transmission pump alone.
The loader always returned to the filter bowl under the transmission, never to the spin on return filter..

 

[ROAMER]

Well in the current installation, loader seems to be working fine. So I will try to leave returns as they are

 

[Tractortech]

Feel free to post some more general pictures of your tractor/loader combination and your valve installation as you go along.. 🛠