Curl leak on John Deere 4410

[chief tom]

The curl function on my John Deere 4410 leaks down. The corresponding function on the rear of tractor also leaks down. Is there anything that can be done short replacing spool valve?

 

[J_J]

Sure, one or more piston seals are leaking in the curl cyl.

Same for the 3pt, piston seals leaking.

It is possible that valve spools can also cause leakdown.