It is hard to keep an overview of the several gear usages. A lot of care should applied for the steering of the wheels. Especially when a servomotor shall be installed. When the wheels are pointing straight forward then the steering axis must be in the + position (not x) for the connection to the motor. Check it in an early state of building. The shape is very likely to the real crane.All functions are given. Motorization is recommended.
A technical high light.
