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Cat MM55SR excavator

Discussion in 'Compact Excavators' started by Fred, Sep 3, 2009.

  1. Fred

    Fred Active Member

    Joined:
    Jul 10, 2009
    Messages:
    31
    Location:
    Australia
    G'day all
    A local contractor in town has purchased a MM55SR painted up in Cat colours, but I think it may be a Mitsubishi, either way it is a grey import as E1G00xx prefix doesn’t come up as a good serial # with Cat dealer. My mate needs to find a few parts, his biggest problem is that the hyd don’t work when levers are used, but if you move control valve direct they with work. The electronic hand control system seems to be the problem, anyone had any experience with these machines or this problem?:confused:

    thanks in advance
     
  2. nork69

    nork69 New Member

    Joined:
    Feb 17, 2010
    Messages:
    2
    Location:
    Canada
    Part request mm55sr

    Is there a way to find part for this excavator? In usa or canada?? Nachi Hydraulic pump ? ? If someone know something please help us me and Fred. Thanks:notworthy
     
  3. gpap123

    gpap123 Well-Known Member

    Joined:
    Oct 13, 2008
    Messages:
    102
    Occupation:
    Civil Engineer - Contructor
    Location:
    Hellas (Greece), Europe
    A friend of me who owns a mitsubishi 5 ton excavator here in my country, replaced the electronic hand control to usual hydraulic controls because he could not find any parts. Of course he paid enough money...
    I also have a c a t graymm and the only way to find parts is to use serials from cat catalogue.
    So, you have to find out the similar to yours cat machine and match the parts serial. But this is also riski because serials do not always fit to the gray machines.
     
  4. cutting edge

    cutting edge Senior Member

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    Mar 27, 2010
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    575
    Location:
    upper canuckistan
    That is a rebranded mitsubishi...as for the problem,is there a bad switch in the pilot enable lever perhaps?
     
  5. cutting edge

    cutting edge Senior Member

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    Location:
    upper canuckistan
    Ive seen that brand on smaller deere and hitachi excavators,mostly on valving though.
     
  6. farmer550

    farmer550 New Member

    Joined:
    Jun 18, 2013
    Messages:
    1
    Location:
    london
    Hi I have the same problem with my 55. The rams operated by the electrics keep cutting out. Did you ever find a solution.
     
  7. gggraham

    gggraham Senior Member

    Joined:
    Feb 13, 2009
    Messages:
    305
    Occupation:
    Licensed Heavy Duty Equipment Mechanic
    Location:
    Canada
    Does anyone know where you can get parts for an MM55SR? Cat is no help and have not been able to find any parts. I'd love to have any service info anyone has. I have a schematic for the MM55SR if anyone needs it.
     
  8. eclipse1290

    eclipse1290 Member

    Joined:
    Aug 21, 2013
    Messages:
    6
    Location:
    Illinois
    Have you tried Maxis corp. Maxis.jp they are in Japan but have been helpful with my MM30SR
     
  9. gggraham

    gggraham Senior Member

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    Feb 13, 2009
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    305
    Occupation:
    Licensed Heavy Duty Equipment Mechanic
    Location:
    Canada
    No parts needed so far, joysticks stopped working but soldered a new ground on computer and all is well.
     
  10. wayneo

    wayneo Member

    Joined:
    Mar 27, 2010
    Messages:
    8
    Location:
    vic australia
    I own a mm40sr and i have the same problem
    have found another thread on "mm30sr" full of people withthe same issues. as far as i can tell they are very simmilar electronicly. I have some error code sheets for these machines but am still at a loss for parts or help.

     
  11. gggraham

    gggraham Senior Member

    Joined:
    Feb 13, 2009
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    305
    Occupation:
    Licensed Heavy Duty Equipment Mechanic
    Location:
    Canada
    Wayne I'd be interested in the code sheets if you can send them. I have schematics if you'd like them.
     
  12. wayneo

    wayneo Member

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    Mar 27, 2010
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    8
    Location:
    vic australia
    that would be great. send me your email eddress i will forward them to you. & i would be very greatfull to know more about were to solder a new earth wire to on the circuit board. a photo or instruction on the process would be fantastic.

     
  13. wayneo

    wayneo Member

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    Mar 27, 2010
    Messages:
    8
    Location:
    vic australia
    my direct email address is kwfitzgerald@bigpond.com happy to help anyone who needs the info & code sheets i have.

     
  14. danielddp

    danielddp New Member

    Joined:
    Feb 23, 2014
    Messages:
    1
    Location:
    Belgium
    Mm55sr

    Can you send me the schematic foor the MM55SR. I have a problem with my machine
     
  15. tmat

    tmat New Member

    Joined:
    Apr 9, 2014
    Messages:
    1
    Location:
    Ballarat, Victoria
    MM55SR Controller Retrofit kit

    We have been supplying controller replacement kits for the MM55SR since 2009. The controller is a non-computer based box, converting the Mitsubishi joystick signals, matched to control the proportional valves. The retrofit is simple, basically bypassing the old loom and using only the existing valve and joystick connections. Please contact me info@imdynamics.com.au for details
     

    Attached Files:

  16. Tiaro excavatio

    Tiaro excavatio New Member

    Joined:
    May 15, 2014
    Messages:
    1
    Location:
    Tiaro
    Steve here wanting to purchase mm55sr controller kit can I have contact number for you please
     
  17. PeterV

    PeterV Member

    Joined:
    Jul 6, 2013
    Messages:
    6
    Location:
    Australia
    Graham any chance i could get a copy of the schematic? I have the same problem with a MM55SR that the joystick controls wont work.
     
  18. deepsouthcc

    deepsouthcc New Member

    Joined:
    Apr 24, 2015
    Messages:
    1
    Location:
    western australia
    Graham, we would very much appreciate a copy of an electrical schematic for the mm55sr if you can help thanks.

    deep southcc
     
  19. 2pitbulls

    2pitbulls New Member

    Joined:
    Jul 24, 2015
    Messages:
    3
    Location:
    California
    I know this is old but I have the same problem , where did you find a broken ground ?
     
  20. kevin bordwell

    kevin bordwell New Member

    Joined:
    Nov 16, 2015
    Messages:
    2
    Location:
    oly. wash.
    mm55sr controller retrofit kit, help!!!

    glad i finally found other people with the same problem, can you email me with a price and availability to the U.S. thanks kevin.