LEGO Technic - Bucket Wheel Excavator - 42055

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Product Information

Height 48 cm
Width 17 cm
Depth 58.2 cm
Number of Pieces 3927
Range LEGO Technic
Material Plastic
Minimum Age 12 years
Model Number 42055
Product Type Building Blocks
Type Building Blocks
Weight 5.86 kg
Brand LEGO

Why we love this

Experience the huge Bucket Wheel Excavator! Mine on a massive scale with the colossal Bucket Wheel Excavator, including motorised tracks, conveyor belts, bucket wheel and superstructure, plus a rugged mine truck.

Enjoy building and operating this massive 2-in-1 Bucket Wheel Excavator, the largest LEGO Technic set to date! This awesome, meticulously detailed reproduction of a real-life mining excavator comes with a cool dark-blue and yellow colour scheme and an array of authentic features and functions, including hand-railed walkways, huge tracks and a detailed cab. Switch on the included Power Functions motor and you can activate the conveyor belts, rotate the massive superstructure and maneuver the colossal machine into position. Then activate the boom to lower the gigantic, digging bucket wheel and convey the mined material to the waiting mine truck. When you feel like another building challenge, rebuild it into a Mobile Aggregate Processing Plant.

Product Features:



• Features a LEGO Power Functions motor for an array of motorised functions, including forward and reverse driving, rotating bucket wheel, moving conveyor belts and rotating superstructure, plus a working bucket wheel boom.
• Also features hand-railed walkways, lights, mined-material elements and a rugged mine truck.
• Switch on the LEGO Power Functions motor and maneuver the huge tracked structure into position.
• Activate the motorised conveyor belts and bucket wheel.
• Move the joystickto rotate the massive superstructure.
• Raise and lower the huge bucket wheel boom.
• Follow the mined material from the bucket wheel to the moving conveyor belts and all the way to the waiting mine truck!
• This LEGO Technic model is designed to provide an immersive and rewarding building experience.
• This set includes over 3,900 pieces, making it the largest LEGO Technic set to date.
• 2-in-1 model: rebuilds into a Mobile Aggregate Processing Plant.
• This set offers an age-appropria te building experience for ages 11-16.
• Bucket Wheel Excavator measures over 16” (41cm) high, 28” (72cm) long and 11” (29cm) wide.
• Mobile Aggregate Processing Plant with boom retracted measures over 8” (21cm) high, 34” (88cm) long and 8” (21cm) wide, and over 12” (33cm) high with boom extended.
• Mine Truck measures over 3” (10cm) high, 7” (19cm) long and 3” (10cm) wide.

Number of Pieces: 3929

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Our customers say

LEGO Technic - Bucket Wheel Excavator - 42055 is rated 4.7 out of 5 by 46.
Rated 5 out of 5 by from Fantastic build, burned out clutches I spent a looooong time building this thing over a period of a few months, 30 min a night. Fantastic build--I was constantly amazed at how it was designed. Intricate details, amazing drivetrain design --aside from the fact that the clutches slip all. the. time. I don't mind that it's slow; that's fine. It's that it stops running for multiple seconds at a time until the wheel is nudged. Kinda disappointing. I don't want to replace the clutch gears with solid gears, because I know that would end up breaking the whole thing. But it's so frustrating to watch it run empty and still stall out repeatedly. I was extremely careful on my build to make sure everything was nice and loose and turned easily, to no avail. So to sum up, the build experience is fantastic. The play experience is frustrating.
Date published: 2017-06-05
Rated 5 out of 5 by from It's HUGE! Biggest Set I Own To Date When I first saw leaked images of this set online, I immediately fell in love with it. I wanted it as soon as possible and the wait was agonizing, because it looked just magnificent. I was a bit worried at first when I saw reviews of the set on Youtube, since most people said that the playability of the set was terrible. Nevertheless, I still wanted the set for its sheer complexity and its magnitude of pieces. And I do love it. Starting with the building experience, I felt really challenged with the whole process, as I was paranoid about messing up a single step. But that's what makes this set and any other large Technic set engaging. This set fits matches my personality as a Lego builder perfectly, since complexity and a challenge is very important to me. But do be warned: This set requires a HUGE amount of patience and skill to complete. This is not a novice set, believe me. As for looks, I was a little less satisfied, especially on the opposite side of the excavator(the opposite side of what's shown on the box). On that side, most everything was exposed and looked half-baked. This is understandable, because this is after all a huge Technic set where functionality comes before looks. Nevertheless I was still unhappy with the the exposed frames, wire, and bright-colored axles in the build. And now for the crucial part of this set: The playability. Like I said before I was worried that this would be an issue since so many other people think it is, but I must disagree. The slow speed is entirely realistic considering what this set is based off of. As for the ability to pick up set's included "cargo," it's actually not bad. Bucket wheel excavators in general are not designed to pick up things that are on the surface in the ground. They have to dig into the mound of soil around it. While this ability of picking up cargo is not the best, this is preferable to me since it makes the set more realistic that way. Plus, once the cargo is actually picked up, it's fun to watch it go through the neat little conveyor belt systems onto the small truck, which is great even on its own (it could be a separate set) As a whole, this set really did go above my expectations. It is very accurate to the real life excavator: a complex monstrosity that is just under 4000 pieces and its just fun to play with aside from its minor downfalls with looks. I highly recommend this set to anyone who loves a good, challenging building project, as its a great addition for any Lego fan's collection.
Date published: 2017-05-21
Rated 4 out of 5 by from Moves at a pace that rivals glaciers. It's a large, fantastic set, with only one problem - it can barely move. Due to its massive size, the piddly little motor provided in the set (XL! Ha!) can barely even turn the bucket wheel, and sometimes not even that. This isn't helped by the clutch-gears on the back, which save the motor from burning itself by overstressing, but severely limit the power the motor is able to deliver. To give you an idea of just how bad this can get, the fastest I've ever seen the bucket wheel move is 5 degrees per second. That's a minute and twelve seconds for every full rotation, in the best circumstances. It normally takes longer than that because there's a lot of friction between the actual gear-wheel and the six small gears that support it. That, and so much down-gearing is required to even make the motor move it AT ALL that it's going to move slowly regardless. And I don't want to hear "but the real thing moves slowly too!" because no, the real thing does NOT move this slowly. It'd be like powering the Titanic with a Prius. It's a fun set to build, but kinda disappointing once you get it running. I'm thinking of setting up a pneumatic motor on the back of it just to get it moving at a decent pace, or a modified electric RC motor. Honestly, anything is better than what comes in the box.
Date published: 2017-05-06
Rated 4 out of 5 by from This thing is ginormous. This thing is huge, it was a heck of a lot of fun to build, and while there are some small things I'd definitely like to tweak, it's a pretty good set overall. I haven't had the trouble with motor skipping, though I can definitely see the potential for same. It's definitely important to have a good mental model of how all the gearing is going to work, reading ahead in the instructions is *super* important if only to gather some understanding of how the whole thing will work. That plus lots of testing of gears ahead of time can avoid a large array of issues. Probably the biggest thing this model has going for it is it's sheer scale. Eight phases of construction, nearly all of the roughly 4,000 pieces used in the A model), a massive gear box situated up at the top of the model where you can really get a good look at it in action. The movement is slow (and thus accurate to an actual Bucket Excavator), but satisfying. It's big and complex, Rube Goldberg-esque in some ways, but it really is a sight to see when it's all put together. That said, there are definitely some decisions I don't care for. First, there are some loose pins left in the model that probably don't need to be there (though it might take a little cleverness to hide them). This is a minor gripe that mostly is a pet peeve of mine, perhaps they represent something on the real machine, but they don't look particularly great on the model. Second, a number of the functions are unpowered, when they very easily could have been. I'd've loved to see the lift/lower actuators given a spot in the gearbox, even if that meant a separate control panel (perhaps lower near the lower conveyor locking panel) and an additional motor (I think I may try to retrofit in such a system at some point in the future). Additionally, the lower conveyor's control system is at best somewhat confusing. Specifically, the 'locked/unlocked/neutral' control doesn't seem to really have any substantive difference drawn between the 'locked' and 'unlocked' state, and even when locked, there is a *lot* of play in that lower conveyor. Practically speaking, I just generally leave it unlocked most of the time. I'm less disappointed by this being unpowered, if it were IR remote controlled, I would more annoyed, but given the functionality is *just* the rotation of the lower conveyor, it's not a big deal. I think the biggest issue with the model is actually that it doesn't have any kind of whole-model rotation (i.e., the tracks are in lockstep, you can go forward, or backward, but cannot counter-rotate to turn). I'm not sure if the real Excavators can do this, so perhaps it's more accurate to have it unable to self-turn, but given how big these things are, they must be able to turn on their own, so it's disappointing to not have that functionality available. I don't think that having independently driven tracks would've been *too* hard, but it definitely would have added more complicated gearing in the base, and probably a few hundred more parts. I view that as a feature, not a bug (I like sets with very high part counts). Overall, I think this is a really fun build, and so far it's definitely got some jaw drops and 'wows' from the people I've shown it to, it's really a pretty big statement sitting up on the shelf next to all the other great Technic models in this construction subtheme. I look forward to the next big set!
Date published: 2017-04-06
Rated 5 out of 5 by from great build The spirit of LEGO technic is in its construction. As a Pakistani AFOL I only build large sized sets. The excavator when finished is well worth the 18 hours I spent making it as I did not want to make a single mistake. . It is huge and a very satisfying build. The movements are a replication of the monster excavators that are steady and slow, so I would not call it sluggish but actually it is totally realistic. Full credit should go to the design team. I was pleasantly surprised that the excavator can rotate endlessly if left on a battery. The forward movement is also ok. what do you expect; a construction equipment going at the speed of a Porsche! LEGO should continue giving us sets this engrossing each year.
Date published: 2017-03-21
Rated 5 out of 5 by from Welel Well this was almost 12h of fun a bit noisy while working with functions and some bits missing but other then that well worth it
Date published: 2017-02-10
Rated 5 out of 5 by from one big model :-) wow took me 3 days to build this monster lol. i now have technic thumb syndrome putting all these parts together
Date published: 2017-02-02
Rated 5 out of 5 by from This thing is HUGE!! I tossed up between this and the overpriced Porsche (42056). Even after reading some of the reviews about how slow it is, it doesn't work etc. I still choose this bad boy for the sheer size and number of parts and value for money. over 3 nights (11 hours total) this monster was complete. Now I was thinking about the other reviews when it came time to fire this beast up. KAPOW!! It lives, the bucket wheel turns perfectly along with the conveyor belt and it rotates with no issues at all. Yes, it is slow when moving forward or backwards, but so what its HUGE! The finished A model is a beast but is very sturdy. You can carry this thing by holding the top part of the arch. A couple of other things to note: The lower conveyor belt lock slides like +30 to -30 degrees. The control panel has many functions. But the operation is limited. You cannot mix any rotation with linear movement. i.e. The bucket wheel cannot rotate when the excavator is moving forward. Don’t let a few reviews put you off (I didn’t). This monster is a must have for any Technic Fan.
Date published: 2017-02-01
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