MOC - LEGO Technic 42203 C-Model - Road Grader

[Paul B Technic]

LEGO Technic sets are always a source of inspiration for custom builds, and the LEGO Technic 42203 is no exception. While the official A model offers some good functionality, the true beauty of Technic lies in the ability to create alternate builds (C-models) that push the limits of what the available parts can do. One such build is the Road Grader, a construction machine that levels and smooths surfaces.

Concept and Design
The idea behind the Road Grader was to maximize the use of the truck's parts, while introducing a functional blade mechanism, rippers and steering. Road graders are essential in construction and roadwork, making them a perfect subject for a LEGO Technic alternate model. The challenge was ensuring a realistic blade movement while keeping the structure stable and maintaining playability.

Key Features of the Build
- Steering: The grader includes a steering mechanism often seen in real-world graders, providing precise manoeuvrability. This can be controlled via the steering wheel inside the cabin or via the top exhaust funnel.
 

- Adjustable Grading Blade: The build includes a blade that can be raised and lowered simulate grading functions.
 

- Rear Ripper Attachment: An added ripper tool at the back can simulate breaking up tough ground before grading.
The design and building process took about 10 hours, across a few days.

Final Thoughts
This C-model of the LEGO Technic 42203 dumping tip truck, takes these parts and makes them into a detailed and functional Road Grader. It captures the essence of real construction equipment while staying true to the Technic philosophy of engineering and creativity. If you own the 42203 set and are looking for a fresh challenge, this build is a fantastic way to expand your LEGO experience.

 

 

 

 

 

 

 

 

Side by Side with the A Model

 

 

https://paulbtechnic.blogspot.com/2025/03/moc-lego-technic-42203-c-model-road.html

[Jurss]

It is prety OK.

Most probably, I would try to build so, that one of curved panels is blade.

[Paul B Technic]

Thanks for the feedback. I might try swapping the blade over.

[grum64]

I really like this, it shows great creativity. I wish I had the ability to look at a set and see something other than what the designer intended.

[Paul B Technic]

Thanks, I have some ideas for some other C models of this set.