![LEGO Heavy-Duty Excavator (42121)[569 Pieces] Lego Technic Building Instructions | Top Brick Builder - YouTube LEGO Heavy-Duty Excavator (42121)[569 Pieces] Lego Technic Building Instructions | Top Brick Builder - YouTube](https://i.ytimg.com/vi/lE0CuGN4gTM/maxresdefault.jpg)
LEGO Heavy-Duty Excavator (42121)[569 Pieces] Lego Technic Building Instructions | Top Brick Builder - YouTube
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LEGO 42121 Technic 2en1 de Excavadora Pesada en Tractor con Orugas, Juguete de construcción para Niños y Niñas de +8 años
ForelockMocs - Another set of instructions done! And it's an alternate for 42121 by Dyens Creations. https://rebrickable.com/mocs/MOC-75354/Dyens%20Creations/42121-c-model-forest-harvester/#details | Facebook
![Amazon.com: LEGO® Technic Heavy-Duty Excavator 42121 Toy Building Kit; A Cool Birthday;Construction Toys : Toys & Games Amazon.com: LEGO® Technic Heavy-Duty Excavator 42121 Toy Building Kit; A Cool Birthday;Construction Toys : Toys & Games](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/81jGt4wkulL.jpg)
Amazon.com: LEGO® Technic Heavy-Duty Excavator 42121 Toy Building Kit; A Cool Birthday;Construction Toys : Toys & Games
![42121 - Heavy-Duty Excavator - Building Instructions : Free Download, Borrow, and Streaming : Internet Archive 42121 - Heavy-Duty Excavator - Building Instructions : Free Download, Borrow, and Streaming : Internet Archive](https://archive.org/download/lego-building-instructions-42121/42121_web_sec06_nobg.png)