Hello, I have a 2001 773 G turbo, aprox. 2600 hours on it. After about 45 min. of use the hydraulics for the bucket and lift arms stops working. I get 3 beeps and the ACS light goes on, the lift and tilt valve light goes off on left panel. If I shut the key off and restart, it will start working again for about 10 min. or so, then it will happen again. Eventually failing completely when I move the arms or bucket. I am still able to drive it back to the barn and let it sit, just to go through the same process the next day. This machine is very different than anything I have ever worked on. I do have a service manual, but have no idea where to start looking. Would any of you guys have any idea what this could be or where to start poking around? Thank you for any help, Todd