42043 Mercedes-Benz Arocs 3245. Need we say more?

LEGO Technic blog post week 34

Well, since you asked… Markus is happy to talk about our biggest model to date!

With 2,793 elements, the 42043 Mercedes-Benz Arocs 3245 is not only the biggest truck we’ve ever made. It’s the biggest LEGO Technic model we have created to date. (A title formerly held by the 42009 Mobile Crane MK II with its 2,606 elements.)

We had a great experience designing the 8110 Mercedes-Benz Unimog U400. We were hoping to continue our work with Mercedes-Benz Trucks, so we were so excited when this project was given the green light! Every detail has been coordinated with the fantastic Mercedes-Benz Trucks design team.

So without further ado, here are all the fun details!

 

 

Cabin

The cabin is part of what makes Mercedes-Benz Trucks recognizable anywhere. We chose to build the grille with Technic elements. We could have used flat panels with decals but we wanted it to be part of the building experience. We tested lots of building options before we found this solution. The entire cabin is highly detailed with safety mirrors, horns, outside step and railing to hold on to if the driver needs to check the load, sunroof decal, hazard lights, two seats and detailed dashboard. And of course you can open the doors and tip the cabin.

Chassis and steering

All axles have suspension. 2-axle front steering, suspended wheel axles with two differentials, and the rear axles drive a 6-cylinder inline engine under the cabin.

Power Functions

A Power Functions L-motor drives the gearbox that controls four functions you can operate from the sides:

Left side:

  • Move outriggers in and out. (The support legs are operated manually.)
  • Turn the crane – the grabber can lift up to 50 grams of weight.

Right side:

  • Lower and raise the dump bed. There’s a lock on the dump door, so you can keep your cargo under control until you’re ready to release the door.
  • Control the new Pneumatic System with a pump, three cylinders and new hoses. (Markus will explain more about this in another post in a few weeks, so check back!)

(Remember to buy batteries!)

New elements

  • New 60-tooth turntable, driven directly with a 90 degree 12-bevel gear in the main model, and a 20-bevel gear in the alternative model. Extremely stable building experience.
  • A new grab for the main model – and in the alternative model, it’s used as a battery cover.
  • New Linear Extending Elements, used for the outriggers driven by the gear rack and in the crane with a pneumatic cylinder.
  • New cylinders, hoses and pump for our Pneumatic System 2.0!

 

 

New elements

  • New 60-tooth turntable, driven directly with a 90 degree 12-bevel gear in the main model, and a 20-bevel gear in the alternative model. Extremely stable building experience.
  • A new grab for the main model – and in the alternative model, it’s used as a battery cover.
  • New Linear Extending Elements, used for the outriggers driven by the gear rack and in the crane with a pneumatic cylinder.
  • New cylinders, hoses and pump for our Pneumatic System 2.0!

Fun detail

Wheel shocks mounted to the chassis – you can remove them and use them to stabilize the parked truck!

Challenges

Even though it’s a huge model, the space between the axles was still limited when we had to fit the gearbox and all the pneumatic cables and tubes for the crane between them.

Because all axles have suspension, we reinforced the frame to make sure it would still be stable enough to support the weight of the model.

Building experience

The elements are split into six bags. Each bag contains the elements for one complete section of the model, so it’s easy to see where you are in the process. The chassis is split into three separate sections, and you have separate steps for the crane, cabin and dump.

Alternative model

The alternative model is a Mercedes-Benz Articulated Construction Truck. I’ve always wanted to build a big truck with a trailer. And what could be more fun than building it from the biggest set ever? It would have been hard to fit a decent picture of it on a regular Technic box as a main model, but it IS every bit as cool as the main model.

All axles have suspension, both in cabin and trailer. The cabin is the same as for the main model. This truck had to be as close to its real-life big brother as well. But it’s a completely different building experience and set, so you should have enough trucking action to last you for days!

It has a built-in fifth wheel, and the flatbed trailer comes with a built-in motor and gearbox. It has a new style of fully automated outriggers you can extend, lower and lock in one go.

You get a spare wheel on both the truck and the trailer.

Instead of a tip bed, the trailer has landing legs you can lower and raise.

The crane function is nearly the same as on the main model, but instead of a grab, you get an automated hook that turns 90 degrees.

 

Go to the Products section to watch the 42043 Mercedes-Benz Arocs 3245 in action.