I've just finished 9398 4x4 Crawler. The rear motor works properly, but the front motor doesn't: The wheels seem to be locked, although they spin freely when I turn them by hand. What could be the problem?

  • In my version of the set, there is an extra sheet pointing towards this particular piece. It is not a mistake in the instruction, but they put in an additional picture to clarify how it is done correctly.
    – Metalbeard
    Mar 14, 2017 at 9:41

1 Answer 1


Check if Cross Block 90° that is placed in step 53 of instruction book 1 is in the correct orientation with the round hole placed over the motor axle.

Mounting it the other way will prevent rotation of the motor.

  • YOU DID! Solved! One piece in a wrong position and everything locked. Thanks a lot!
    – Cezar
    Feb 5, 2015 at 20:05
  • 3
    @Cezar Then you should also mark this answer as the correct one to give Joost proper credit!
    – adius
    Feb 6, 2015 at 9:30

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