ok.. so bucked works.. but no arm lift.
reseat any hyd connectors.
next, swap hoses onthe remotes to use the bucket remote onthe lift arms and see what happens.
on a sa cyl, if you don't see a exterior leak.. it's not blown packing, like a DA cyl could be.
ps.. there are 63-64 4 cyl 4000's and 65-75 4000's. plenty of differences.. so best to say which it is in case it comes up as a hyd system issue