756C curl issue.

[Fcz23]

The curl on my hoe is weak, slow, and actually will not curl unless I pull the lever back to also drag the arm and boom. If if curl everything up in order to trailer the machine, the bucket will sometimes just slowly uncurl and can be moved by hand.
I broke the cardinal rule and lent the machine to someone that operates; and got it back like this. It may have been pushed a little too hard?

 

[wdchyd]

Might have blown the piston seal in that cylinder. Maybe time for a repack job.

 

[LD1]

Read and/or watch a youtube video on how to test a hydraulic cylinder.

I suspect wdchyd is right and you have all the symptoms of blown seals in the curl cylinder.