Question about Cars & Trucks
Boom and arm dose not move when joystick is first moved and after about 15 seconds starts to move slow. The other hydraulics work ok.
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: After 15-20 minutes of driving
i had same problem and its just oil pressure sending unit its above oil filter just check it if you got some loose wire or somthing .........my problem was ;i had oil in conector i clean it and works jyst fine
Posted on Nov 30, 2008
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.
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Posted on Aug 20, 2009
pressure reliefe valve is malfunctioning as this can be one to several you need special hydraulic meters to know (best bet take it to the dealer) I know that stinks but as they become more complicated so does the repair process
If I helped at all please give me a response negative or positive ( i can handle it ,thanks )
Posted on Dec 30, 2009
At the time you made all the above repairs, did you replace the "throw away" turbo charger? The turbo charger commonly sucks oil, and it is not repairable.
Run it without the inner & outer air cleaner. If it isn't the turbo, run the injector cut out test. If the injectors are ok, then you need to replace the injection system hydraulic pump, which is also unrepairable.
Posted on Apr 23, 2010
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