I just picked up a kx121 excavator that has very weak intermittent track movement, no response from right joystick to boom. Left joystick works to rotate cab, dozer blade goes up and down like it should... I beleive the issue is In the control valve tower, while engine is running the control valve is clicking/tapping like crazy. Thinking some stuck actuators/valves? I'm not afraid to tear into it, have rebuilt numerous skid steer hydro pumps. Just want to be sure if I start taking it apart there is no surprises other than valves/seals. Thank in advance!
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