Alco N scale PA1 cog wheel doesn't get hooked with worm screw

[greatesthobby]

I have incautiously removed the front truck of my N scale Life Like Alco PA1 and here's what's happening after I have tried to reassemble it: the motor works properly but the truck wheels don't turn.Apparently, their cog wheel doesn't get hooked with the worm screw in the chassis even if I press the truck gently. How can fix the problem? Thanks for any reply!