case 930 hydraulics

i have a late model 930ck with 2 remote scv. Several years ago 1 valve stopped holding the implement up after being raised, but if the hoses were reversed so to lift the lever was pushed forward and the implement would stay up. It took a hard push to move the lever like there was something restricting the spool from shifting and when the lever was pulled back to drop it dropped very quickly. Now the other circuit is doing the same. Can the problem be fixed without removing the valve from the tractor?
 
Thermal relief valve . Easy fix .
Have to take hoses off and remove
the one side. Think the right.
Will ne little plastic plunger
and ball an seat . Others
will chime in with better details on
how to do it im sure .
 
Lever working hard sounds like a miss-mating coupler issue. Cyl leak down issue probably inner check valve seat part # A139799. To replace seats, tap 3/8" pipe threads and fabricate puller w/3/8 threaded pipe. Valve will need to come off.
 

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