Hope everyone is well!

Yeah It's been awhile! I've an issue hopefully one of you gents can help out with. The 3pt hitch on my 1026R raises but the second I touch the rockshaft lever it goes straight down fast. I've checked the height of adjustment valve and it seems to be fine. Fluid level is good and the rate of drop seems fine. I can keep the MMM and hitch in position using the flimsy little lock lever but without it no go. Mine is a mechanical lift model.

Any suggestions?

Thanks in advance!
Larry