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I have both the WSM and the supplemental minor change update. I think it was getting 5v to the sw. Power on at all times to the open position, no change going to the close position. Reversing connections at the pilot solenoids causes the issue to reverse (thumb goes to full close not open)...

Have swapped feed wires to the solenoid coils and reversed the issue. Coils seem to be working as well as the hydralic flows they control.

Yes. have followed as I can with no sucess resolving the issue.

Yeah, been there to. No luck with reply's.

Have replaced the Joystick, rules out the rocker sw. No change in the problem. If the main control valve were stuck, it would seem that swapping the wires at the solenoid would NOT cause the problem to reverse. Changing the Joystick also rules out the hammer operation sw being stuck. Guess I am...

Really need help with my KX-91 3 s2 thumb issue!

Hydraulic thumb stuck in open position. Problem started with thumb not functioning at startup. Shut down machine and restart would correct issue. Got progressively worse and would fail at random times during operation. Again, shut down, wait 30-60 seconds and restart would correct the problem...