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Mss-SR Mitsubishi excavator moves and lifts lowers

M55-SR Mitsubishi excavator moves and lifts lowers backfill blade but no otter hydraulics. Think it is faulty boom sensor or the gadget that read depth of the bucket feeding info to computer I cant find any electrical diagrams that tell Me the part that will not allow electric hydraulics to work... any ideas

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I think I can help you with it. Last year I had similar situation with my MM55-SR flashing red CPU light. The arm stopped moving, but the blade was working and I could drive as well.
I inspected all position sensors in the arm - each joint should have one. They look like small cylinders bolted to the joints of the arm with 3 wires coming out. In my case I had problem with the first sensor located by main (boom) piston where it is attached to the body of the machine. I removed this sensor from the arm with its wire. One wire was broke very close to the sensor housing. I was able to solder it and it solved my problem. Sometimes those wires can touch to the metal arm and rub off insulation causing electric shortage which also may stop the arm from moving. Check all connectors and wires for each position sensor first.
Hopefully this will help solving your problem.
If you want to share your experience you can email me at

Posted on Aug 20, 2009

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We may have a similar problem. Email me at

Posted on Aug 07, 2009


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