BlackSmokeandMetal
Member
Hello all, as above when operating this machine at low idle rpm like a warm up scenario, if anything more than 1/4 or half movement of the joystick booming up or arm out it will pull the engine down and if not feathering the controls back toward neutral it will stall the engine. i have diagnosed down to the point where i believe either the MCX controller is not functioning correctly or the MCX controller is not recieving 1 or more of the required sensor signals it needs to operate the torque control solenoid valve and destroke the pumps when a drop in engine rpm is detected. From what i read the torque control solenoid recieves a decrease in voltage from the MCX controller when a drop in engine rpm is detected.
I have measured the voltage at solenoid while pulling engine down close to stall and there is a constant 24v which does not fluctuate.
I can disconnect this solenoid and the problem is solved but then the pump remains at min displacement and movement is very slow.
All pressures and speeds are visible through the monitor so i dont suspect a sensor issue, but i am no expert so asking the question.
Has anybody had and or solved similar problems on deere or hitachi excavators??
Thanks.
I have measured the voltage at solenoid while pulling engine down close to stall and there is a constant 24v which does not fluctuate.
I can disconnect this solenoid and the problem is solved but then the pump remains at min displacement and movement is very slow.
All pressures and speeds are visible through the monitor so i dont suspect a sensor issue, but i am no expert so asking the question.
Has anybody had and or solved similar problems on deere or hitachi excavators??
Thanks.