Set Facts
- This giant bulldozer is based on the real-life Caterpillar D11.
- The set uses 116 of the new in Yellow (6321711|69910) treads. It's a new, wider version of Technic Link Tread Wide with Two Pin Holes, Reinforced (88323).
- The Technic CAT D11T can be controlled by the CONTROL+ app, allowing it to showcase its functions, such as controlling the front and rear steering, movement of blades, rippers and ladders to properly simulate the bulldozer.
- The price of the set was increased from $449.99 to $499.99 RRP in August 2022.
Regional Retail Prices (LEGO.com/Store)
Cat D11 Bulldozer Reviews
New Elementary
“The Cat sure feels like a powerful beast. From what I was able to test, its functions work well, even if a bit slowly. It has interesting parts, including the large angular motors, the several molds in yellow, and especially the new tread links.”
Eurobricks
“Bigger isn't always better, but the sheer size of the vehicle is impressive and its ability to move rather fast is even more impressive. All things considered, I love everything about this set and I do think it's a masterpiece. At this point I do think this is my new #1... More set.”
Theme Analysis
Lifespan
21 mos (this set 24 mos)
Annual growth
+3.96% (this set +15.23%)
This set's annual growth (CAGR) vs. subtheme
Community Stats
Cat D11 Bulldozer currently ranks #46 out of the top most owned sets in Technic.
About Technic

TECHNIC is one of The LEGO Company's main lines based on creating detailed model machines and mechanical toys with specialized beams, axles, gears and connectors. The theme was first introduced as the Expert Builder series in 1977, but was officially renamed as TECHNIC in 1984.
Summary
Technic Cat D11 Bulldozer set 42131 was released on October 2, 2021, retailing for $500, it has since been retired. New, unopened sets are valued at $896, used ones can be found for $436.
Read more
Celebrate a hero of the construction world as you build a replica version of the biggest Cat® dozer with this LEGO® Technic™ App-Controlled Cat® D11 Bulldozer (42131) kit. This large set lets adults enjoy quality ‘me time’ focusing on their passion. Just like the real Cat® bulldozer, this model is built in modular sections. LEGO fans will love the new-for-October-2021 LEGO element – a large track that can be tightened and loosened. And the build is just the start! With many authentic features and functions packed into this model, there’s lots to discover.
Take control of your bulldozer model
Use the CONTROL+ app to operate and explore this heavy-duty machine. Use the app to drive and steer. The app delivers realistic movement as you raise, lower and tilt the blade or raise and lower the ripper and ladder.
Build a mighty construction vehicle packed with details with this huge LEGO® Technic™ App-Controlled Cat® D11 Bulldozer 42131 model building set for adults.
Description provided by LEGO©