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?
According to Bricklink, Set # 7730 has this motor :
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.