You have been some good advise from the others.
If the problem is the screen then more than likely you have another problem.
Iím the guy that replaced the oil in a cherry 1370 only to have the oil dissolve the glue right out from underneath the fiber disks.
The oil I used was something other than Hytran
I split the tractor and cleaned it out but in the end I also pulled the PTO housing and took a long steel brake line tub that I bent a half moon shape on the end so I could blow the screen clean.
I also washed the screen with a flood of diesel fuel.
You will have to do this several times because the amount of fiber is so great it will plug you off if you leave a little.
You can also blow the screen free by installing a tire type screw in valve at the filter pressure port.
This will allow you to run the tractor at idle for a short amount of time before the screen plugs up again.