Mini ex tracks non responsive

[Crystal Waterscapes]

I have a bobcat 435 mini exc fast track. I was driving it when I heard a snap or crack noise and the tracks quite turning. All the other hydraulics are still working. When I try to move forward or backward I get absolutely no response. I don稚 see any hydraulic leaks. My machine is stuck on a job site, I need to finish and get it out of there ASAP. Any ideas on what the possible problem and fix my be.
Thank you for your help
Robert