Kx 121-3 hydraulic thumb button stopped working

[vwbrian]

I've had this excavator for about 10 years, yesterday the thumb on the bucket quit working. When I press the button on the console no light and no beeping occur. The light does come on when I turn the excavator on, so I know the light isn't burnt out. I've also checked all the fuses. Any suggestions?

 

[North Idaho Wolfman]

Find the valve that controls it and look for power to the solenoids, if nothing there, work back, might have a relay / or relays to control the solenoid.