It's either linkage or the spool. My guess is the spool given recent "rebuild".
Lift your cab, disconnect the linkage and check for the hangup. This isolates the spool or linkage. If it's the linkage, it's easy to find the problem with it disconnected from the spool.
If it's in the spool, it can be a piece of debris, probably a piece of O-ring from soemwhere(metal debris will cause a more severe jam-up) but my best guess is your detent cap has been improperly assembled, a common occurrence during valve rebuilds.
There are little balls and springs for float detents and if they're jangling around out of place it will give you such troubles.
The lift spool is the middle spool on your valve, with the long back-cap. You need to drain your hydraulic tank-clean catch if you want to re-use, and if you're lucky, you can slide the spool with the cap to the rear of the valve and out after removing the socket-head capscrews, fore and aft along with the boot, with a 3/16" allen.
Don't pull the cap off the spool or springs and balls go flying. There's an e-clip holding the cap to the guts inside. Remove the clip and slide the cap off. The guts are held to the spool by threaded stud. This loads the centering spring and the spring washers should be centered on the assembly. You will also see at this point if your springs and balls are out of place. You need special pliers to assemble it correctly.
My advice is if you want to fix it yourself, pull the spool up to that point and take it to the dealer and watch while the detent section is assembled, then take it back and re-install it, with new spool seals.
Good luck.