Mitch G:
I have been following your post and subsequent replies.
I agree with Richard. Sounds like you have a loss of Hyrdo pressure.
Here is an image of what you should have....
I would suggest doing the simple things first.
(A) Remove both check valves (Item #1). Clean and inspect them. If you Cub has the ones as pictured in the image above, the center button has to move freely up & down. Make sure that is accomplished. There is a spring & ball inside and those parts have to move freely also. You can use your favorite parts cleaning solvent to clean them up. Once clean, blow the valve out with compressed air. Once clean , dry, and all parts move freely, dip into some Hytran & reinstall.
(B) If your Hydro has the "automatic" check valves, the procedure is the same except for the middle button through the top.
(C) The Charge Pump Relief Valve (Item #2) could also be your culprit. That also can be removed. Simply there is a Spring and a Cone. This also has to be clean from any foreign debris. The Spring can be replaced if it is weak or broken.
Lastly, if you have a Pressure Gauge (0-1000# range), you could install this on the test port (Item #3).
If you don't have any pressure after all the above, there is a problem with the Charge Pump.
Check this out and get back with us and give us an update.