Kubota kx121-3s thumb control problem

Daniac19

New member
Apr 25, 2019
1
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Anderson Indiana
I just installed a thumb on my kx121-3s. It came from factory with cylinder mount, hard lines, toggle switch on joystick. I have switched to two way on valve. And it is in correct mode, light on continuous. I can toggle to left and thumb will close, but let off , and it returns to full open and under load. Can anyone tell me what is wrong.