Western Star 6900 Twinsteer

10,00  -Excl. Tax

Western Star 6900 Twinsteer in LEGO Technic, remote controlled drive, steering and winch. Tandem bogies suspensions with oscillating arm, removable hood with fake working engine, and openable doors complete the model, as well as a mud pump as the load. Available in multiple motorization (Control+, PFS, Buwizz, 2.4ghz Battery).

SKU: WS6900TS Category:

Video Presentation



  • Western Star 6900 Twinsteer in Lego Technic : Scale ≃ 1/20 to 1/25
  • Remote controlled using Control+ Hub and PoweredUp App (LEGO) (also compatible with Power Functions systems, see below)
  • Drive : 2 L motor with 12/24, 12/20, 20/28 (differential), 8×4, no locking differential
  • Steering : L motor which drives both axle with different turning radius made using variable connecting rod
  • Winch : L motor with worm gearing
  • Suspensions : Tandem bogies with oscillating arms
  • Removal hood with fake working inline 6 diesel engine
  • Openable doors
  • Diesel Mud Pump in container style with optional motorization
  • Available in Control+ (PoweredUpp App), Power Functions System (IR Remote), PFS (buwizz) or PFS (2.4hg Battery like Cada)

You can read the full review of this model on the blogpost.


How to build ?

If you have already the parts : you can purchase the PDF instructions only on this page which also includes the Mud Pump instructions in 4 different versions :

  • Control+ (PoweredUpp Smartphone App) + Tutorial for set up the Control Profile in the App (example)
  • Power Functions System (IR LEGO Remote)
  • Power Functions System (Buwizz battery)
  • Power Functions System (2.4hgz battery like Cada one)

If you do not have the parts, you can purchase the complete kit from two different retailers :

Each instruction contains the partlist at the end, but you can check individually on Rebrickable or in the bill of material below :

If you are interested by the Mud Pump only, please see the product page here.

For the Control+ app version : please ensure you first that your device (smartphone, tablet) is compatible with the PoweredUp App From LEGO (available for Android and iOS). (example of the tutorial)


About this product

Instructions preview

Bill Of material

Version on the top right

Additional information

Model Size

49x13x18cm 1.4kg




All, Truck


Yes (with drive)

Building Difficulty


Piece Count

1511 (truck), 584 (Mudpump)

Bill Of Material

See rebrickable links in the description

Purchased File

PDF Instructions (221 pages / 76mo) + (79 pages / 22mo for Mud Pump)
PDF PoweredApp Tutorial + Matching Blocks (12 pages / 2mo) for Control+ Version