Bobcat 610 variable speed valve spurting oil out rear

[CharlieNH]

I just put a new hydraulic pump in my 610, so I'm not all that surprised to see some leaks that I never saw before. My pressure had been way down. Could use some help with this one. When moving the variable speed control from fast to slow by pulling the lever back, I see oil spurting out of the very small hole right in the center of the cap on the rearward facing end of the valve. Can someone tell me what's under this cap that might be causing this leak? There must be a blown seal somewhere I assume. I see two such valves in the parts manual. Was there a switchover at some serial number? Thanks!