RJGarcia,
Welcome to TBN. You will get a lot of help and suggestions here, however if you provide a more detailed description of your location, temperature and operational situation before and when this happened I think you will get better results.
The analogy is when your wife or significant other calls and says - it just stopped HELP! We need more information..
For instance,
Were you digging with the hoe or the bucket,
What was the outside temp, then engine temp
What were you doing just before it quit,
How long was it running before it quit - hour, 4 hours, 10 min
What was the RPM
Were you on a steep slope,
How many hours on the unit
Do you have leaks - if so where and is it Hyd or Fuel
Did you lose digging force prior to it stopping
If Hyd where do you think the hydraulic fluid went,
When was the last time you checked the hyd fluid,
Then the simple stuff, fuel, fuel filter, interlock switches etc.. there are a number of switches that could cause this and its a process of elimination to figure out which one it is.
There is a clutch, PTO, range selector switch and maybe more, but I dont know of any hyd fluid low level switch..
So start with the simple things as it is usually the issue/problem - I hope..
Carl