"the bucket simply goes limp on occasion"
This happens on my 4310 w/ 420 loader all the time. I go to dump the bucket, or curl it all the way down, and it just stops for 2 or 3 seconds, then starts up again. Doesn't matter what engine speed I'm using. Doesn't matter if the bucket is empty or full.
I thought about dropping a couple of Viagra into the hydraulic reservoir to see if it will keep my bucket from going limp, but I figure if it does work, it would only be temporary anyway.
Would be nice to figure out a permanent fix, as this is really annoying, and could someday prove dangerous. Hope someone has an answer for this one.
DT