Lehner XL2400 locked up...

[jnev]

I was having a great little bash session at a new local spot I found until... cog - cog - cog... truck just sits in one spot without moving. At first I thought one the motor connectors came off because it was only cogging, but I checked them all they seemed fine. Then I tried to push the car on all 4 wheels and it wouldn't budge. So I tried to turn the pinion and it appears to be completely stuck. So I got home and took out the motor, and the only way I can turn the shaft is if I hold it with pliers, and twist the motor can by hand...

So, any idea's what could have happened to the motor? I would like to take it apart... is the end cap screwed on? How should I unscrew it assuming that it will be VERY tight? This was also in my CRT.5, and motor as mentioned before is a Lehner XL2400.

Thanks for any help in advance.