Help with Touch Control

[1Sarge]

I have a problem with the touch control on my '61 F Cub. It was leaking so I did a partial rebuild a while back installing most of the O rings but did not tear it down completely. I have used it some since and only with a rear mounted planter and really did not notice a problem until today. I mounted the lay-off bar on the front cultivators and noticed the lift was leaking down rather fast with the tractor running for a couple inches and then would lift back to the original position and then leak back down again. Does anyone have an idea what is causing this? I replaced the lift piston O ring and control valve O ring along with a few others when I repaired it. Thanks for any help.

[tst]

is it low on fluid?

[1Sarge]

Checked fluid first thing. It is full.