Motor from a loaded model

I am trying to put the rotor in the middle (yellow sphere), but the position property does not work. How can I place the rotor in the center and make it rotate around itself?

PG: https://playground.babylonjs.com/#5W5B6W#66

I hastened with the creation of the topic, I did what I wanted

 newMeshes[3].position = new BABYLON.Vector3(4, -15, 0);

newMeshes[3].computeWorldMatrix();
newMeshes[3].bakeCurrentTransformIntoVertices(true);

After changing the position of the object, it was necessary to add 2 lines, which I indicated above

PG: https://playground.babylonjs.com/#5W5B6W#67