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.
Now, went to total failure. Stays loaded in the open position (whether or not the aux control is activated). Unloads by lifting the lockout arm. Changing the valve to one way releases pressure. Occasionally I can hear the pump load when moving the rocker SW on the joystick but not always. Swapped the connectors at the proportional solenoid valve and the thumb goes to closed (not open).
At this point, it seems that - (1) the rocker SW is bad. (2) the main control valve block is stuck (3) the SW for hammer operation is stuck in the operating mode (4) computer has failed (5) I have a wiring short.
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.
Now, went to total failure. Stays loaded in the open position (whether or not the aux control is activated). Unloads by lifting the lockout arm. Changing the valve to one way releases pressure. Occasionally I can hear the pump load when moving the rocker SW on the joystick but not always. Swapped the connectors at the proportional solenoid valve and the thumb goes to closed (not open).
At this point, it seems that - (1) the rocker SW is bad. (2) the main control valve block is stuck (3) the SW for hammer operation is stuck in the operating mode (4) computer has failed (5) I have a wiring short.