Case 850B won't move!

Hi,
Sorry if this is a dumb question, but I'm new to these things...

I have a CASE 850B track loader which has been great and runs well. The other day, the transmission pressure line to the gauge burst, sending transmission fluid all over the engine. I repaired the line, and refilled the transmission with TCH fluid (it took 5 gals!). Started it up, checked for leaks, all good. But it won't move! nothing...

Transmission hydraulic gauge shows green, and bounces a little when I shift...

Case 850B won't move!

Case 850B won't move!