The 42054 Claas Xerion 5000 Trac VC is one of the three new Technic sets released in the second half of 2016. It's quite a large set at just under 2000 parts but still only half the size of the 42055 Bucket Wheel Excavator. The Claas Xerion really stood out to me as a quite unique build.

Box Contents

I don't recall any other large Technic sets having numbered bags, so this was a surprise. The #1 bags built the main Tractor, while the #2 bags built the crane arm. I think normally the numbers are used to help reduce the number of parts you have to sort/search through. In this case, probably about 80% of the parts are in #1 bags so it didn't help much to separate them.


There is one new part design - the huge 23798 Tractor Tyres which I'm fairly certain are the largest produced so far?

These tyres are no joke!

Comparing with the next two biggest tyres I own - the 76023 Tumbler wheels and 42037 Off Roader

There are several parts appearing in new colors (well mostly Lime):


The build starts off with some framework and the rear axle.

It quickly starts to get weird. I found myself using the term "weird" quite a lot while building this! One of the features of this model is the ability to switch between normal/4wd/crab steering - a term I enjoyed explaining to my kids :) The use of the asymmetric triangle beams on the steering axle shown below is the first hint of this mechanism.

Sliding the lever actually causes the axle to turn, due to the asymmetrical positioning of the triangle beams. This is why there are some weird non-standard supporting structures around it.

The three settings and how they move the axle

Next up, we add some more framework and connect the front wheel axle.

There is a linear actuator on each end, which provide the same function. Either the counterweights or the crane arm can be attached on either end, and raised/lowered via the actuators.

The single medium motor is mounted at the front (under where the battery compartment will go) and drives all power functions.

There are lots of sliding mechanisms in this build and I often found myself wondering what they will be for. An example here is the beams used to connect the battery switch to the 'tooth' switch.



The rear mud-guards are connected to the main body, whereas the front guards are connected to the wheel steering mechanism and so turn with the wheels.

The front engine cover has a nice shape.

Next up, we build the cabin components.

The completed Tractor just by itself looks awesome!

The counterweights are added to the front of the tractor using a simple but clever mechanism that secures it while making it easy to remove. A couple of half-bushes to secure the actual weights down would have been nice though as they just fall off the axles when handling the tractor.

Now we open all bags labelled #2 (i.e. the rest of them) and start building the crane arm, which doesn't take long.

The finished build with all attachments in place.


There are plenty of functions in this model. Some of which use the single medium motor, while some are manual.

Powered Functions:

  • The cabin can move 180 degrees via the 'tooth' switches on the right side of the tractor. The cabin has a little wheel underneath it so it lifts up and rolls around to the new position. A Clutch gear is used to prevent damage to the gear train/motor once it has reached it's final position if the motor is left on.
  • The crane arm can be moved up and down.
  • The crane arm can rotate 360 degrees - as long as it is extended all the way up or it collides with the cabin.



The crane arm can actually be used at the same time as the cabin rotation if you wish.

Manual Functions:

  • HOG steering is a little tricky. With such large wheels, they don't turn easily and the cabin would often move before the wheels. Lifting it off the ground or turning while moving is better. I would have liked the wheels to be able to turn a tad more. The turning radius even with 4 wheel steering is quite large.
  • Steering selector - normal/4 wheel/crab steering via the manual switch in the rear. Sometimes it was hard to move without some jiggling.
  • The engine compartment is accessible by raising the hood and using the axle to prop it up. This also gives you access to the battery compartment.
  • The top of the crane arm can be extended/retracted via the manual gear wheel.
  • The crane arm claw can be opened/closed via the manual gear wheel.
  • The entire crane arm unit can be raised/lowered.
  • The stabilisers on the crane arm can be extended/raised. When locked in place, and the unit lowered sufficiently it will actually push the tractor off the ground and the rear wheels are free to rotate.
  • The crane arm and counterweights use the same attachments and so can be swapped if desired.





The B-Model is a Class Xerion 5000 Trac VC with Silage Plow. It requires taking apart only the crane arm and counter weight attachments. It uses most of those parts to create the Plow which attaches to the rear and can open up wide or close via the connected power functions.

While this doesn't have the same level of functionality as the crane arm attachment, I think it looks much nicer! Maybe this was a reason why they split the bags into #1 and #2 as the B-Model only uses parts from bags #2. Anyway I decided to go ahead and build it.

It connects to the main Tractor via a couple of clever mechanisms that lock easily into place.

The switch (shown as a red axle connector above) connects the Plow to the motorised gear chain. When the motor is switched on, the outer fins open up or retract.

The linear actuator is used to extend half of the Plow out to give it an angle. I have no idea if this is a typical feature of Silage Plows.


Weird! But in a good way :P

I found the unusual techniques quite refreshing and interesting and they kept me guessing how everything was going to work together. I found myself making lots of small mistakes during the build, I'm not sure if that was due to an increase in complexity or simply because I was tired (I tend to build only late at night).

The changeable steering mechanism is awesome and something I've never seen on a Technic model before.

The Tractor is a beautiful recreation of the real Claas Xerion. The curves and angles of the engine/cabin are captured very well.

While the Crane Arm was ok, I like the Silage Plow better. And since the B-Model keeps the main tractor intact it is easy to build both and decide for yourself.

The 42054 Claas Xerion is available now for US$180 via LEGO.com.

Disclaimer: This LEGO set was provided for review by The LEGO Group. Anything said in this post is the opinion of the author and not The LEGO Group.


  • 1 year, 8 months ago Bolbuyk Level 18 MOC Designer
    This is such a good set in a lot of ways: the model looks good and is recognizable, a decent bunch of lime technic pieces that are quite rare, fortunately no piston engine, awesome tires, lot of functionality and a modular construction on the front and the back so you can easy something of your own. Designing a big technic MOC is quite a challenge, but you can start to design a tool for the tractor attached on the back or the front. Maybe my favorite technic set of recent years.
  • 2 years, 10 months ago RogersFamily Level 5
    Seems like a small modification to make it into a silage chopper.
  • 3 years ago Gutworks Level 10
    Thank you for great review. This set is on my wishlist. I was just about to purchase it, but went the 42055 Bucket Excavator instead. But, I'm sure it will be added to the collection sometime in the near future. :)
  • 3 years ago dkurok Level 17
    I've got thios set now ! can't await to have the time to build it up! Thank you for the review!
  • 3 years, 5 months ago Fritz38 Level 4
    Once built it is a real mantelpiece for display! Like previous user mention it was a joy to snap together and no really boring moments (like doing a akward 5 page piece then it says X2!!!) :) Nice review and nice photos!
  • 3 years, 5 months ago Diament Level 2
    Bought it yesterday. Didn't finished it yet but I can confirm - I also made some simple mistakes during build. I was surprised because despite I always bulid late night too, I usualy don't make mistakes.
  • 3 years, 6 months ago Ben205 Level 3
    Having driven one of these in real life, I'm really surprised to see a technic model of one as they're not exactly common in real life. Definitely going to pick one of these up the reason it comes with a crane is that in Germany they're quite frequently used for wood chipping - as for the silage plow they do indeed pivot like that; here's a video https://www.youtube.com/watch?v=8h_fGsMOoF0
  • 3 years, 6 months ago Chilekesh Level 12 MOC Designer
    Finally built it today. Easily the worst design I've seen. I can see that TLG tried to do something different, all the while ignoring the failures on so many other levels. The cabin action is sloppy, steering is very weak and axially strains the parts a lot. It sways all over, the model quite lacks the rigidity of similar sized designs like 42030. Unsatisfactory overall except the wheels, that are the largest and may produce some interesting MOC's in the future.
  • 3 years, 6 months ago mistakecargo Level 6
    Maybe many folks feel boring about crane. Seriously, another crane again?? Jesus TLG....
    IMHO, Silage plow is much better and cooler than A-model. I built this set to A-model 3days ago just for some photos, then today I recontructed to B-model. BTW, thanks for GREAT review!
  • 3 years, 6 months ago psmyth Level 16
    I like the design also. Just got my set today and will have fun building this one for sure!!
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