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  1. T

    Mitsubishi mm30sr

    If any function of the electric over hydraulic system fails, the whole electric control system stops. this could be from just a frayed lead going to the position potentiometers on the boom or corrosion in the connections, particularly ay the control box so check all these first.. But most...
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    Mitsubishi mm30sr

    Wow! You might have solved a problem with a lot of these machines. Joysticks are notorious for going bad, new replacements are not available and used ones are very scarce. Adjusting potentiometers might be a repair for a lot of these machines thought to be irreparable. I did not realize...
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    Mitsubishi mm30sr

    When I posted this regarding error 66, I stated that to check-- If not labeled, pull 182 off and facing contact point end with lock mechanism up, lead 8 will be fourth contact from right of bottom row of contacts and contact 10 should be third point from right on top row. That should have...
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    Mitsubishi mm30sr

  5. T

    Mitsubishi mm30sr

    Check your voltage readings at the test points TP1-4 first! I did not when my machine broke. Spent a lot of useless energy and time trying to test sticks unhooked from the system. Useless to do so. Checking the TP outputs will save a lot of headaches.
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    Mitsubishi mm30sr

    Right. When the joystick is not being deflected by operator, it should return to a fairly stable center position. I cannot remember exactly, but seem to recall that springs or other mechanical devise inside the joystick return it to neutral. When moved from neutral a microswitch activates and...
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    Mitsubishi mm30sr

    Glad to hear your communication problem is fixed. But the error codes indicate a bigger problem--JOYSTICKS!. Codes 52,53,54 indicate the voltage output of the joysticks when centered is not within specifications, 52 is for front-back function of left hand stick is below 2.3 volts, 53 is for...
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    Mitsubishi mm30sr

    Cannot find a SLE error. Maybe you have a bad LED on monitor and it should be SCE. SCE is code for communication error between connector 39 at monitor and connector 101 at controller. The manual is somewhat confusing. It shows a diagram that wire 11 of connector 39 leads to wire 7 of...
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    Mitsubishi mm30sr

    Also---This machine records errors in the monitor. If you simultaneously push the red button under the seat, the button left of the numbers on the monitor and the top button of the three vertically stacked buttons on the right edge of the monitor , the LED should display "S-E 4" or "S-E 5"...
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    Mitsubishi mm30sr

    I had the problem of intermittent operation in the past. Boom would not work until I shook the machine vigorously by engaging the tracks forward-reverse-forward-reverse-etc. This was most prevalent after a rain or heavy dew. What was happening was poor signal strength from the boom...
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    Mitsubishi mm30sr

    I have an MM55SR2 that had boom operating problems. Suspect the system is the same or similar on all the MM series machines. I have a manual translated from Japanese with troubleshooting procedures and wiring diagram. When anything in the boom operating system malfunctions, the whole system...
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    Mitsubishi mm30sr

    David- A diff.trans. is a sensor in a valve that provides spool position to the brain (controller). There is one on each of the electronically operated valves. The wire is usually located near the back bottom of the valve. If the brain is easily accessible, the easiest way to check these is...
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