Ok, so there is one common component between old and new pumps - the charge pump. Can someone explain to me what purpose the charge pump serves in a hydro trans?
Here's the part diagram for the Hydro Gear unit used in most of the newer Cubs (with exception of some of the 3000 Series). It's a BDU-10 unit, used in a wide variety of applications. It also has a strong track record for being a quiet, reliable, and decently strong GT hydro.
http://partstream.arinet.com/Image?a...%26langId%3D-1
There are several valves involved. The one I've read could be the culprit is behind the charge pump (o-ring I'm gonna replace is there as well). On the diagram, it is parts #25 and #22.
I'm not familiar with servicing hydro pumps nor am I very well versed in how they function. This is a learning experience for me.
On a lighter note, I towed a good heavy load of firewood uphill today and although I had to be heavy into the pedal, it did just fine. It still doesn't feel 'right' though...