If u haven't yet go on Jlg.com and download the service manual...buy an analyzer to help with troubleshooting...then verify u have power and ground to high speed coil...if so..download parts manual and try to find another valve that has same part #...swap valves and see if it then works...is so order new valve..if not...u missed something..could be in joystick or box but analyzer will verify that
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