I have a LEGO 7865 Red 12 volt train motor from a LEGO 7730 train set. The motor has stopped working as it has been dropped on one of the wheels.

How can I open the motor case to effect a repair?

  • 1
    Do you want to open the train unit or the motor itself?
    – Mast
    Dec 21, 2017 at 2:14
  • I need to open the red case of the motor itself. I think that one of the gears has been forced out of engagement, maybe the shaft is bent,
    – RAP 77
    Dec 21, 2017 at 10:28

2 Answers 2


According to Bricklink, Set # 7730 has this motor :

bb12va Electric, Train Motor 12V Modern Type I with 2 round contact holes

For disassembly and repair you can look at this large post with pictures on Eurobricks by Andromeda


Unfortunately, repairing it will not work, if the shaft is bent, as the wheel would just fall off again.

  • 1
    Replacing shafts is something routinely done on non - LEGO mechanisms. Why wouldn't it work here, if it's bent?
    – Mołot
    Apr 4, 2018 at 8:55

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