42009 LEGO Technic Mobile Crane MK II

by LEGO®

42009 LEGO Technic Mobile Crane MK II is rated 4.75 out of 5 by 68.
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Get ready for the biggest, most complex LEGO® Technic model ever — the Mobile Crane MK II! Drive this 2,350-piece behemoth of a model into position with the cool 8-wheel steering and rotate the superstructure. Then activate the included LEGO Power Functions motor to extend the outriggers, lower the feet and extend or raise the crane arm up to 75cm into the air. Lower the hook with the working winch and get ready to lift the load! This authentic 2-in-1 model also features 10 wheels, 5 axles and a detailed V8 motor with moving pistons. Rebuilds into a container stacker and truck featuring Power Functions motor-powered extending and raising boom.

Dimensions: 18.80000" H × 3.60000" W × 22.90000" L

Shipping weight: 3.5 lbs.

UPC: 673419191890

Sub-brand: LEGO® Technic
Found in: Building Sets
Appropriate for ages: 11 - 16

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$249.95  ea

$249.95 List Price

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Reviews

Rated 2 out of 5 by from By far my least favorite product Along with my partner (both Legoholics), we built over 15+ expert Lego products at home. We absolutely loved all the products so far, and purchased customized shelves to place them on, but the crane was seriously frustrating and not fun to build. 1- The parts to build are too repetitive, are this product has LOTS of pieces. 2- There was an issue in the clutch power, everything mechanic in the product was not/barely functioning. All the cool features (the support parts, the crane) were not working although we rebuilt the product 3 times to make sure we weren't doing anything wrong. Would not recommend this product, go for the Shield, the minivan or mini cooper, or Star Wars for a better experience and value for money.
Date published: 2015-08-12
Rated 4 out of 5 by from nice crane works fine and feels god to play whit it
Date published: 2015-08-06
Rated 1 out of 5 by from Poor Toy Dont Get It For Starters its a fun build until you get to the Gears. Pros - Fun build Cons - Be very careful putting the Gears in Place, one mess up and you will be taking gears all apart and rebuilding. Also the Outriggers don't even work and are poorly put together. The Boom is Very difficult to put together and the instruction manual for the strings is difficult to put together. Don't get this I would not recommend this to anyone. If you want to get this get the VOLVO L350. Much easier then the MKII. Volvo L350 very impressive and the green 4 cylinder engine is pretty looking.
Date published: 2015-08-03
Rated 5 out of 5 by from Interesting Build To start off, IMO (in my opinion) this is a challenging build and I recommend it to Advanced - Expert Technic builders. However if you want a challenge go for it, if you can follow the instructions you should be fine. PAY CLOSE ATTENTION to books 4 and 5 because 1 simple mistake can mean dismantling the whole thing, I missed one gear in book 4 and I had to take the whole thing apart. Books 1-3, simple just the truck and book 6 also simple. The winches lifting power is approximately 150 grams, it could lift my ipod (~197grams) but the clutch gear kept slipping. The which could lift a 97 gram LEGO object no problem. The cranes arm however can lift a lot, I tested it with a 571 gram tape measure and it lifted it off of the table no problem. Overall, great product and it does have play value to it just not a lot if you wanted to actually be able to use the which to lift objects.
Date published: 2015-07-14
Rated 5 out of 5 by from This set is pure joy This is by far the best set i've had the pleasure to put together. I've never seen so many gears in one set. the two gearboxes and over 6 drivetrains take up the entirety of the model. i was in total bliss through the entire build. following the drivetrains to see which function they powered was really exciting. the ending model looks great and is solidly constructed. it easily has the most features i've seen on a technic set. It has so many different pieces including the 32stud axle that feels like its a mile long. after i finished putting it together i had to go back and get another one just for all of the pieces.the frictionless 8 tooth gear opens up a lot of doors. I only have two downsides. first is the price but it's well worth the money considering the engineering that went into it and the sheer amount of parts that come in the box the second is that the superstructures gearbox is on one side and the trucks gear box is on the opposite side. i really enjoy building this set each time i rebuild it and happily recommend it to anyone.
Date published: 2015-06-03
Rated 5 out of 5 by from Great Buy Awesome build. Really cool to see how everything comes together to make the Mobil crane. The 8 hours to build it is worth the time spent to have this as a functional display piece. Highly recommended buy!
Date published: 2015-04-25
Rated 5 out of 5 by from Best set ever!! I had not bought Lego for a while because Lego had lost their way a bit with sets like "Slizers, Competition, Robo Riders & Speed Slamers". All I can say is well done Lego, we need more sets like this. If you are a Technic fan like myself you must but this set.
Date published: 2015-04-22
Rated 5 out of 5 by from wonderful investment the gear box on the super structure was amazing, blew my mind that so much lego could be packed into one machine. the gear train for the lowering/ raising of the outriggers, could be designed different, i think there are to many 8 tooth gears trying to mesh and work together, and that really bogs the motor down. but where the power is transferred down from the super structure into the truck body, remove the tan double bevel gear, and the one sided tan bevel gear, and a L motor will fit nicely in that space. having 2 L motors would work wonders, but i only have one for the time. all in all the crane is amazing, its a conversation piece when its on the living room table.
Date published: 2015-03-21
Rated 5 out of 5 by from Satisfying build! Challenging and time consuming, but worth every minute! I built this over the course of several days, and aside from the occasional frustrating mistake (requiring small rebuilds), total build time was somewhere around 16 hours. There are 6 instruction booklets - the first 3 make up the vehicle portion of the build, while numbers 4-6 are the operating seat (power functions) and the crane. I would say the first three books make up 60% of the build time required so I slowed down a bit after finishing that section. Anyways I had a great time building. Lots of pieces, gears, and moving parts. Requires some attention to detail but that's what I was hoping for when purchased. Well worth the price for the number of pieces and the time needed to complete building. Hoping for more large and challenging Technic sets!
Date published: 2015-03-07
Rated 5 out of 5 by from This is a very good project toy as it have many interesting parts to make.
Date published: 2015-01-30
Rated 4 out of 5 by from Pushing LEGO pieces to the limits This set is very fun and challenging to build. The final model seems to be pushing LEGO pieces to their limits - the whole model is so weighty that you feel that some pieces will fall apart. It would be great if they included remote commands like in most flagship sets, but it's still very good. Loved the amount of pieces. 2600+
Date published: 2015-01-17
Rated 5 out of 5 by from The longest build ever and so much fun! I just purchased this set last week and received it a few days ago. As soon as it came, i got to work building it. It took just over 7 Hours to build! Made some mistakes along the way which required me to take some of it apart to fix but luckily, it is designed in such a way that it allows for easy disassembly. There are so many pieces included and great techniques used to build this model. Not only does it work but it can also allow you to expand the build. I have already made some modifications to the crane and am now looking at motorizing some of the elements that were not originally motorized. I highly recommend this set! Get it before its gone again!
Date published: 2015-01-15
Rated 5 out of 5 by from Best Flagship Model to Date!!! This thing is a beast and then some. given the usual cost of the flagship models this is really good value for money. It's not only big but its packed full of technically advanced functions that really embodies what the Technic line is all about. One thing I would have liked to have seen was an additional motor to serve the truck body, out riggers etc instead of the huge, inefficient drive trains that had to be used to do it all with just one motor. it would have added minimally to the cost of the set and made it function far better. The build is really fun with lots of different techniques and far less repetitive than some of the larger models can be. Looking forward to integrating the Remote controls of the Volvo model into this beast.
Date published: 2015-01-15
Rated 5 out of 5 by from Excellent Value - Keeper for My Lego Collection Upon opening the large fold-out graphic carton, I discovered six books of instructions, and twenty-four bags of parts. The bags were numbered and the books were too. Each of the three large components of the crane were built from the corresponding numbered bags, thus helping to avoid from having 2606 Lego pieces out on the table at one time. The instructions were well shown, the circled items gave a focused view of the changes being made. I found it interesting as the instructions gave directions to assemble some features to true up the axels, and then gave directions to un-assemble them. The features of my crane work exactly as they were shown on the website! I was very excited when all of the parts worked after being built. The outriggers, the large 30" boom, and all of the moving parts were fun to build and fascinating to watch them in action. Some changes I would like to make are: 1. Working headlights 2. Seats that have studs to help hold the Lego figures in place 3. Remote control to operate the rolling of the vehicle and steering Excellent value, a keeper for my collection! My next project will be the Container Stacker and Truck using the parts from this crane and the instructions available online. Thank you Lego Company for designing this splendid mobile crane. My most challenging Lego project to date. I look forward to seeing your new creations.
Date published: 2015-01-01
Rated 5 out of 5 by from Most complex Lego kit and also most fun to build We have a lot of Lego kits in our family, including several of the modular buildings, the Death Star and Super Star Destroyer. Those are all great kits, but none of them are as complex and make you think like the Mobile Crane Mk II does. I spent about 20 hours or so constructing the model, 2 to 3 hrs of which were spent correcting mistakes. I cannot stress it enough to those of you considering buying this: take the time to read and fully understand each step of the build before actually putting pieces together. Once certain parts are together, you're going to have a lot of difficulty getting into the various components to fix your mistakes. I had a lot of fun building this, and even troubleshooting the errors was fun; it made you look at the build like a mechanic, having to trace back gears and shafts to find out what's going wrong. The biggest issues I had involved using the wrong color beams on one of the outriggers (Lego, you've got to find a better way to distinguish between dark gray and black in your manuals), and the tan gears on the stabilizer jacks themselves were backwards on the right side. The clutch system that allows you to control four separate functions with one lever is ingenious, and the steering function was designed by someone who definitely knows what they're doing. Everything operates as it should. All in all this might be the most enjoyable build of all the Lego products our family has owned, but I would recommend the MkII to those who already have some experience putting together geared assemblies in other Lego models before tackling this behemoth.
Date published: 2014-12-30
Rated 5 out of 5 by from To Big 42009 is to big for the moter but not for me it took me 3 days to build it. And it could use some upgrades
Date published: 2014-12-23
Rated 5 out of 5 by from awesome kit i ran into this kit while christmas shopping and decided to buy it cause it looked amazing. very difficult build even had to back track a couple of times to fix stuff. in the future i would strengthen the lifting force of the outriggers, it doesnt have much force to lift it. all in all great job
Date published: 2014-12-22
Rated 4 out of 5 by from I think that 42009 needs update with Power functions 1.It would be remote control with full steering and drive 2.Crane is totally controlled with remote control turning 360 degrees
Date published: 2014-12-10
Rated 4 out of 5 by from Lots of fun to build, very challenging... i got this for Christmas, and it was very difficult to build. the model, when finished was AWESOME, but i had not had much experience with Technic sets, and some of the power functions did not work, probably because of some silly mistakes i made while building. i have thought about taking t apart and starting all over again, but i havent been able to bring myself to do so yet :(... still an amazing set, and i would reccomend this to anyone who likes a challenging build.
Date published: 2014-12-06
Rated 4 out of 5 by from A long fun build. Problem at the End This monster project will keep you occupied for a long time. On two subassemblies I had to hunt down a misplaced gear (out of about 50 gears). I loved doing that. Very rewarding to find the out the location of misplaced gear and fix it. What I didn't like was the string used to raise and lower the two arms of the crane. The instructions were useless. I never did figure out how to run the string. I would venture that only an expert Lego builder could get it to work. A big disappointment after so much work.
Date published: 2014-11-19
Rated 5 out of 5 by from very brain challenging great make by lego. the pieces inside the crane actually represents how a real crane is made and works great purchase for future mechanical engineer kid:). my son did this when he was 10 years old
Date published: 2014-10-10
Rated 5 out of 5 by from Hands down, the best I ever had If you buy this set, you won't regret it. While you're assembling it, you see tiny tiny pieces becoming something HUGE. Also, I should add that seeing how the mechanics work and interact with each other is tremendously satisfying, and what got me interested in engineering in the first place. To add, the little movable objects (such as the seats, the smooth turning wheel, engine, etc) makes it feel alive and just like the real deal. I should also point out that there were some missing pieces. Being such a large construct, it is completely understandable, and the first time it ever happened to me. But, even then, Lego showed a trustworthy customer support, by shipping them to my place with an apology letter. Definitely a must-have for Technic fans.
Date published: 2014-09-24
Rated 5 out of 5 by from Childhood dream finally came true I was helping my daughter to build one of the Lego Movie set. And I got stuck on Lego, wanted to keep on building something bigger, more complex. So I chose this large Technic set which is the kind of build I dream about when I was a child. Getting real Lego set during my childhood times in the country I grew up in was a luxury item, let alone a huge set like this. Took me 2 Sat and Sundays to finish, it all went well following the instruction books(6 of them). I just made a couple mistakes that found after a few pages of steps but luckily it was easy to fix without taking it all apart. This is a very interesting design to use just 1 motor to power 5 different functions. For mechanical minded purpose, it's a good building experience. The finished product is big and probably weight couple kilogram. There is no easy place to grab to carry it. If you just grab the tires, you will easily disconnect 1 of the steering tie-rod(happened to me twice). I found that the best place to hold it is the side dark gray frame at about mid section(use both hands, 1 on each side). The loom seems reasonably sturdy but I haven't try lift heavy items with it extended all the way. My daughter and I have fun playing with it. I'm addicted now, will probably tear it down soon to build the alternate version. After that will tear it down again and I will try to get my daughter to build it. And next purchase might be 42030(the opposite of this set, lots of motors to power individual functions); or the mindstorm set 31313.
Date published: 2014-09-22
Rated 5 out of 5 by from Amazing Set! Was super excited to build this set when it came in the mail and I started on it right away. It was the first set I had ever purchased and built to have Power Functions. It was also the most challenging build to date out of all the sets I have but also the most rewarding when it was finished. It is a great addition to the several other large Technic sets I own. 5/5
Date published: 2014-09-20
Rated 5 out of 5 by from Challenging and fun Great build, well worth the price. Like most sets, but this set especially, pay very close attention to the gears and placement of each. It's very easy to go through the motions and place a gear on the wrong side of a construction, only to discover 30-40 steps later you messed up.
Date published: 2014-08-23
Rated 5 out of 5 by from 42009 Mobile Crane Mk II Now this set really is magnificent. It's the biggest Technic set ever as of late 2014, and probably will be for months if not years. It is 970 pieces bigger than the next one down, the RC Volvo front end loader. And yet it's about two thirds of the Volvo's price, which makes this set very good value for money. The fact it has only one motor creates this huge money difference. But to the crane. As I said, it's massive. Heavy, long and tall. The pull-back Desert racer would fit into it over 17 times.The main truck build is very dense, much denser than I expected. Most of the pieces here are structural, which creates a very strong chassis that resists twist and pull excellently. There are a lot of cogs and axles, however, and if not constructed properly will create a friction overload and seriously hinder power transferal to the outriggers to the point of their total malfunction. Even when built right, the lowering/raising of the outriggers is very slow but the torque is there, and when the set is placed so the 4 outriggers only are balanced on books on something, they can actually lift the entire crane. I also like the new red frictionless gears that enables an axle to slide within it. The cab of the truck is very nicely designed, with rear view mirrors, adjustable seat sand head rests, and a steering wheel. The V8 engine, concealed neatly behind the cabin, came as a great bonus. The 8-wheel steering works exceptionally well for a vehicle of this size, and functions smoothly even on the roughest terrain. The differential, too, works well and, by the way, is the very first thing you build. Moving up the crane to the superstructure, things get a lot more complex. We get scores of gears, string, a motor and linear actuators. If you don't pay very close attention, and get even one gear wrong, your set will just be one big Epic Fail. The gear box works pretty smoothly, and one is amazed that two levers control so many rows of gears, all worked out to the last tooth to produce just the right amount of torque and speed. For some reason people always ask if the rotation of the superstructure is motorised, and the answer is no. It is manual, but turns well and goes 360 degrees, which really enhances the crane's maneuverability and opens up new possibilities. The last stage of the crane is the crane itself, the arm. It is a particularly interesting build and is harder than you think. Stage 2 of the boom actually extends with stage 1, thanks to some very clever string manipulation. The extension tends to struggle a bit sometimes, however, especially when the arm is not raised or the load is particularly heavy. By the way, for an idea of how much it can lift, it can lift the Desert Racer, but that's about it. Not as powerful as I had hoped, and the boom raising/lowering needs a clutch, but they're my only real gripes. Overall, 42009 is a very authentic and functional set, which is great fun to build and play with. It is also perfect as a parts supply, with the crazy amount of gears, axles and bits you don't see in every set. It's the perfect ultra set for the experienced Technic builder looking for that something a bit better than the rest. It's value really is outstanding - the fattest Technic model by nearly 1,000 pieces, but doesn't stretch your pocket too much. A winner of winners...
Date published: 2014-08-10
Rated 4 out of 5 by from A good successor to 8421, but room for improvement This crane has a lot to live up to, being the successor to 8421 and also a flagship set. Functionality and Play value: - 4-axle steering works well, but the rake is small. This is a common problem with Technic sets. A real crane of this number of wheels or more (e.g. 7 sets in the main body) can turn easily enough at a set of traffic lights but I doubt the 42009 model would make it round the corner at a scale junction. I removed the blue half pins from the front set of wheels and this made an improvement but the wheels are close to binding on other parts. You just know that if the instructions show half pins restricting the steering then it won't be enough. The steering philosophy of Technic sets needs to be improved. Look at 8479 barcode truck the best example. - Engine and differential gear are the usual fare. They work well. There might be room for a gearbox next to the vertical row of 5 z16 cogs. - The stabilisers are more realistic than 8421. More width of extension would be nice but the long axles and sliding cogs are a welcome improvement to the Technic range of mechanisms. My crane did have a problem getting enough torque to the mini-LAs for dropping the feet though. The white clutch gear slipped when that function was engaged. I think an extra instruction step to test the stabilisers from a temporary motor drive (before building the jib unit) might be a good idea. - The raising of the jib works well, though I have doubts about the linear actuator gearing. The design of the LAs has changed, to improve their internal clutch, but has this resulted in complacency of design by using the gear arrangement from excavator 8043 that failed with the old LAs? This is teaching kids bad engineering. We should be explaining to them why the gears should all line up so that all the LAs extend similarly as the jib is raised, without any differential movement between them. Otherwise someone will do that on a real machine and cause an expensive problem! Don't let poor design principles creep into LEGO sets! - The jib extension works OK but the ratio of extension to original length is poor. More extension from the same length should have been possible. As a follow-on to 8421, a further extension should have been included, otherwise Technic crane technology would not move forward. Of course real cranes can have 6 or 7 telescopic extensions with hydraulics, which would not be possible within a reasonable weight for geared Technic models. - The winch function works well but is a bit slow. - According to the jib gearbox, some of the functions need the motor direction to be reversed in order to make a consistent movement of the whole crane e.g. raise, extend and lower the hook. This makes operating the crane a learning process. Pros: - Stabiliser mechanisms are a useful development. - Stabiliser slide support with angled cross blocks is effective. - Red sliding z8 cogs and long axles. - Plenty of racks, 4x steering and doubled-up for stabilisers. - L-motor has plenty of power, but not as much as the 8421 motor. - Well-built chassis spreads the weight and remains stiff. - 2600 parts is a welcome increase in Technic set size. I look forward to Technic sets of 5000 parts! Cons: - I wish the yellow panel parts (6 on the jib) had not needed additional recessed holes. I hope these will not be needed again. Their design pollutes the population of excellent smooth panels that we have enjoyed in other sets. Unfortunately, once the parts are made, the mould will be used until it expires. I am unlikely to buy any set containing the revised panels unless they are really needed. - Stabiliser drop function can have torque issues if not tested before adding the jib. - Mis-use of linear actuator clutches to solve differential issue in jib raising gear trains. 8043 excavator lesson not learnt. - Needs more extension of the jib compared to its original length. I think this is an adequate successor to 8421 but some functions are not quite so good. Steering rake and jib extension ratio should be improved next time. Looks are not quite as good as 8421, partly because the wheel hubs are the other way round. Value for money is good in parts count terms. For the Mk III crane, in a few years' time, I would like to see a mobile crane using the Unimog wheels, with pneumatics for most of the functions. It would be possible to use pneumatics to drive all of them if extensions, rotating air engines and proportional steering techniques were employed; this would certainly add to the Technic range of mechanisms. It would need several compressors. I would like to see the return of a motor like the 8421 motor as it is more powerful (torque x speed) than the Power Functions motors and more suitable for driving high loads quickly. I have seen a real mobile crane with 7 sets of wheels in the main body, 3 steering at the front and 2 at the back, with a 4-wheel trolley carrying the counterweights. Time to start the design now! An additional small crane for lifting counterweights onto the back of the jib would be an opportunity for a realistic additional mechanism to offset the cost.
Date published: 2014-07-31
Rated 2 out of 5 by from Epic model, with an epic flaw I'm the odd one out here, seems everyone here is happy with 42009. Really can't say much more thats all ready been said about 42009. In saying that my experience with 42009 has been somewhat disappointing. Those annoying outriggers, could never quite figure them; I was left unhappy with it. Over looked build, no mistakes that I did, just mistake by that one Lego designer who made 42009. Those out riggers are just flawed , was that unhappy sold it to someone else to deal with the puzzle. Wile I enjoyed the build and like the look of it, I could not keep an model with a design flaw, sad to see it go happy that I no longer have to look at a paper weight. Shame that the outriggers spoil the whole model.
Date published: 2014-07-27
Rated 5 out of 5 by from HUGE Technic set This was my bigest lego set ever and i is awsome. Lego blu mi mined out when i got it. Overall this carane is awsome an HUGE. There is two bad things, the outriggers are supper slow and the winch does not pick up that much waight compard to its scale. But it is still awsome. Pros HUGE doors open tall sturty Cons outrigers are super slow winch is not strong
Date published: 2014-07-03
Rated 5 out of 5 by from Awesome Build This set was truly a challenge. That's a good thing! I like the fact that a LEGO set can really challenge me in the building process. The time and effort put in to this build was well spent! THANK YOU LEGO!! You people are the best!! :-)
Date published: 2014-06-27
Rated 4 out of 5 by from Crane A few pieces were missing from the project. Overall a very detailed and interesting project. However the motor seem underpowered and it struggles to move features sometimes. I am going to order the XL motor and see if this helps. But I am pleased with my purchase
Date published: 2014-06-02
Rated 5 out of 5 by from awesome build as an adult fan of lego i found it a challenging build as i had to get it right first time. once finished the size is pretty big for a toy. intend adding motors to make it mobile. i was impressed by the amount of weight the crane could lift. 228 grams. awesome !. the two different shades of yellow pieces were the only negative about the model.
Date published: 2014-05-31
Rated 5 out of 5 by from Holy Cow! Amazing! Get ready for the most incredible LEGO model ever. I built this with my 18 year old son and we spent about 10 hours doing this. The set comes with 3 distinct phases and 6 (YES SIX!) huge instruction booklets. The truck portion has 3 booklets, the crane base has 2 and the crane arm has 1 booklet. The first phase (parts bags labeled with a "1") is the longest and intense. We REALLY suggest sorting all parts as you begin each phase. (for example putting all identical parts in a pile before beginning each phase) The 20 minutes you invest in this will payoff due to the sheer VOLUME of pieces! The thought that went into this model is nothing short of AMAZING. They really put something amazing together here. As you build BE SURE to make certain that all axles and gears spin very freely. With all the transfer of motion from place to place in this model it is important that power moves easily. The 4 way shifting of the power unit on the crane base is nothing short of genius! The use of parts was well thought out and we (both long time builders) were very impressed. The use of the battery pack as a counter balance was great and the use of the string to telescope the the smallest section of the crane arm was a great way to use power efficiently. Be sure to look at the instructions carefully on this one a small mistake early on in the build could make you nuts later on. Test each function as you go. You will love building this model.
Date published: 2014-05-19
Rated 5 out of 5 by from Brilliant When I first unboxed this product I was amazed the the sheer amount of pieces. it was my biggest Lego set ever and my first technic set, so I wasnt sure how well i would do building it. I would only recommend this product if youve had years of lego experience, and preferably some technic experience (I made numerous mistakes throughout). I set about building it and it was incredibly complex, but easily worth it. the most incredible part of the set has to be the gearbox which controls all the motorised functions. Its tricky to build but incredibly clever. Overall this set is difficult but amazing.
Date published: 2014-05-11
Rated 5 out of 5 by from Awesome !!!!!!!!!! This is a must have. Absolutely impressive. Nice work Technic group! Thank you Markus !!!!!!! As a Mechanical Engineer I really appreciate what you have created with Lego elements--fantastic. I am anxiously waiting for the 42030 Volvo loader availability in the US later this year.
Date published: 2014-05-05
Rated 5 out of 5 by from Mother of all Lego mobile cranes What is big and yellow, highly complex, and will likely triumph over every Lego set you have in your room as a giant monolith? It's not a trick question; it's the latest 42009 Mobile Crane Mark II from Lego Technic. The Walkaround To recent date, there have been two other Lego Technic mobile cranes: #8053 in 2010, and #8421 in 2005. Arguably only 8421 (or Mark I) was truly worthy of greatness; in fact, it kickstarted a whole new generation of construction vehicle builders. In comparison however, 42009 (a.k.a MK II) completely overshadows its predecessors, both in size and overall complexity; first hint you get is when you pick up the box; packing 2,606 pieces. So yes, it's heavy. The Building Experience There are 6 (six) instruction booklets: 3 for the truck itself, 2 for the superstructure, and 1 for the crane arm. Lego has also purposely divided up all part bags per each section of the set, so making sense of 2,606 parts is a lot easier. The instructions are clear and extremely precise all the way; this is a good thing when you're dealing with a project this big, this complex and involving thousands of pieces. One thing though - and I cannot stress this enough - is pay very close attention when fitting all the modules together, particularly all the bits involving gears and axles. This is crucial to the model functioning properly in the end; in my case, I bolted two components together backwards, so the outrigger system failed to deploy. Luckily, I noticed this in time and switched the components into the correct place. As I learned, be sure to check every major assembly twice before moving onto the next page and you'll be just fine. In terms of building it though, it was one of the toughest and the most rewarding Lego Technic experience ever; and this is coming from someone who's been building Lego Technic for almost 15 years. Scale and Features Without any exaggeration, the MK II Mobile Crane is massive. Crank up the crane and extend the outriggers, and it becomes even bigger. Details are all in the right places too; opening doors on the truck and crane cabin, V8 engine, and tons of cool stickers. This is easily one of the biggest Lego Technic sets I've ever seen. The MK II's functionality is mouthwatering; 8-wheel steering system, working V8 engine with differential, deployable outriggers/arms and of course, full crane functionality with 360-degree capability. And here's the kicker: all the MK II's power functions are achieved by just one motor; which is why there are multiple gearbox controls on the crane and two on the truck to be able to manually operate all the functions. Adding more motors would of removed much of the very brilliant and well-engineered gearboxes, but it would of consequently driven up the cost of the set as well. Never thought I'd say this, but I actually prefer the gearboxes in this case; makes you feel like you're in that cabin maneuvering the controls. You'd also be surprised how much weight the crane can lift until the motor starts to struggle. That said, you can get yourself Lego's Power Functions XL-Motor, L-Motor, IR Receiver and remote control, and you can start adding more motorization to your crane, should you desire more. Conclusion As a technical challenge to your inner engineer, as a test to your skill and patience as a Lego builder, the 42009 MK II Mobile Crane is a fantastic example of what the Design Team over at Lego's Technic division can achieve when they really put their minds to it. But it's more than that. It's a brilliant toy with lots of guaranteed hours of play time for any child or adult (or childish adult) to build and enjoy over and over again.
Date published: 2014-03-27
Rated 5 out of 5 by from Big, complicated, impressive, fun This is a really huge build, as others have said. And it makes a large, robust, impressive looking crane. A few observations: - the main build is actually pretty dense, with all the cogs and mechanisms - the crane motor unit is the most complicated on both builds, but particularly so on the main crane - so many cogs in such a small space! - the alternate build is less dense, but obviously has three parts to it, making it more fun play wise - the main crane arm can take some weight, but it is obviously not meant for heavy lifting, especially with the arm full extended. - there is a huge amount to learn, with both models, in terms of techniques, mechanisms, etc. One thing I really liked is that each model takes a different approach to the use of the crane arm and the main mechanisms are very different in both. - the complexity though was beyond me, and though I could appreciate it, my brain isn't big enough to be able to apply much that is here. I am sure others can though - these are cranes, so not meant for speeding around, but the secondary vehicle on the second build was the most fun to drive around - the most impressive thing to me on the main build was the extending legs, followed by the use of string to control the extension of the crane arm - the most impressive thing on the second build was the way the crane arm's gripper grabbed hold of the container.
Date published: 2014-03-21
Rated 5 out of 5 by from Waited forever I have never waited in anticipation so much of getting a Lego set since I was a kid in the 70's and getting sets 855 (crane) and 853 (Big Car). When I received the box the first thing to note is the sheer scale that awaits you...and then it gets better. Make sure you allow about 18-24 hours build time for this one! After sorting the bags (great idea) and opening No.1 you realize this is not going to be a walk in the park, like sets of old. The size of the truck base and the turning it around, and over, makes it fun seeing how the things will work from different angles. The No. 2 section is by far the most tricky if you haven't had a set with the switching system of levers before, I had and knew what I was doing, but newer Lego users may need a bit of help here. No. 3, the boom...great to see a 2 stage boom which moves so smoothly. I was very impressed. Overall I think this is the most impressive models in Lego Technic history. It sits well with my 9396 Helicopter and is a must for any serious Lego builder
Date published: 2014-03-14
Rated 5 out of 5 by from Well worth the money I found the build to be average for difficulty. Sure there were areas some what challenging but for the most part pretty straight forward. The model is pretty impressive. The whole model seem to be nothing but a big transfer case of gears. The whole time you are building the model it seems you are putting together gears. But with that said the functions that it can do from only one motor is pretty impressive :) The over all build was one of the better models I put together. I like the fact the stabilizer arms actually bare the weight of the vehicle when fully deployed. I never ran into problems with the gears having to large of gaps everything seems to be just right and the clutches in the system work. I think one motor in plenty for the crane. What would be cool though is if there was a remote control for the driving of the truck since the steering already well geared with all the turn wheels and it already geared for 2 drive wheels.
Date published: 2014-02-24
Rated 5 out of 5 by from First Technic Set-FUN Build This was my first Technic purchase, and it was a good one. I had been hesitating getting into Technic, and can't say I am that I am in yet. However, Mobile Crane MKII just could not be passed up. It was quite challenging, but very fun to build. There were a couple of things I did wrong, but was able to figure them out, without too much dis-assembly. Would highly recommend this build to anyone.
Date published: 2014-02-12
Rated 5 out of 5 by from This Is The Best LEGO Technic Set Ever!!!!!!!! This the best lego set I have ever built and used. When I first heard that this was going to be a challenging build I didn't believe that it provide such a challenge. I think that would have made this set even better is if the crane's steering, driving and the physical crane were remote controlled.
Date published: 2014-02-04
Rated 5 out of 5 by from Biggest yet This model is huge when complete, anyone thinking it can't be worth the price is very wrong. You have to take care with the instructions as there is plenty of scope for errors. The power functions are generally impressive, the only slight disappointment is the speed when lowering the outriggers, this takes quite a while. Sometimes the model seems to struggle with the outriggers, this may be as a result of the length of the rods used to transfer power. Given the size of this kit maybe it could have done with two motors, although I appreciate this would have increased the cost further. Overall this is a great Technic set and a massive improvement over previous crane models. I'd be happy to recommend this crane to anyone and for the size and functionality I think it represents good value for money.
Date published: 2014-02-01
Rated 5 out of 5 by from Fantastic product - best Lego I've ever had! This product was fantastic - I haven't played with Lego for years, then browsed the Lego web site and saw this and SO wanted it, so I was then given it for Christmas! It took me about 2 days to build it (16-18 hours in total), but that's because I was also doing a time-lapse photography of me building it, so if you search YouTube for "fishsponge lego" you'll find my two time-lapse videos of me building this fantastic crane! Thank you Lego for creating this!!
Date published: 2014-01-30
Rated 5 out of 5 by from 42009 MKII At first thought that the price tag was a bit steep but when i got the set home and started to build it i was in complete AWE! This has to be the best build/set i have ever seen/built.
Date published: 2014-01-28
Rated 5 out of 5 by from Fantastic! I found this model a delight to build. It was my first build of a technics model and I found it quite difficult in places but all the more enjoyable for it. You need to be very, very careful when building the parts with gears as if you choose the wrong one or put something slightly out of place you could be faced with literally hundreds of back steps to rectify or a non-working model at the end. I made one such mistake about half way through the build but fortunately it was accessible without too much dismantling. The kit can be rebuilt as an alternative model container stacker but I can’t bring myself to dismantle the crane yet! You have to download the instructions from the lego site and if you want to print them out it will take you over 300 sheets of paper! Perhaps use a tablet instead? Value wise, this knocks spots of other models such as the architecture series and some of the franchise stuff such as star wars. For instance, it takes about the same build time and has a similar amount of parts to the death star but is only just over half the price. It’s also more varied and challenging. Can’t recommend this model enough. If you’re looking for something different from standard bricks then buy it – before it gets discontinued!
Date published: 2014-01-26
Rated 5 out of 5 by from 42009 Crane Mk2 When I first saw this model on display I wanted it yeah I know I wanted a challenge and I got one. upon opening the box I liked the way the pieces were listed no confusion there. Then I started wow what a build. What got me was the size of it previous to this I had built the 9395 model the tow truck again a good build but nothing compared to this. Once completed see if everything worked and joy of joys it did. I can recommend this younger people might need some help on it but worth it in the end.
Date published: 2014-01-22
Rated 5 out of 5 by from A GREAT & CHALLENGING Set It was awesome building this set. I had to take time to separate the pieces before constructing this set. My recommendations: (1) there is a gear that would be position just near the motor, I would put in the gear first ( Booklet 4, step 63 p. 38) before installing the motor. I try to put the motor in according the instructions, but it was difficult to get the gear on the cross axle. (2) After constructing the control assembly (booklets 4 & 5) and placing it on the truck (Booklets 1-3), I would make sure that the motor is able to bring the outriggers in & out and up & down before permanently attaching this assembly onto the truck. (3) I would put all the black pegs and the longer blue pegs into a small container to keep them separated from the other pieces.
Date published: 2014-01-06
Rated 5 out of 5 by from Great build This was my first technic set. I discovered this is a lot different than clicking bricks together for a modular building. Much different. I found the build to be very challenging. The thought that Lego put into this is incredible. The instructions are clear and unambiguous. The play function is great as there are so many motorized parts/functions on this set. If you have a child who's a future MIT or Georgia Tech student, this would be a great challenge for them.
Date published: 2014-01-02
Rated 5 out of 5 by from Coolest Building Experience! This is easily the coolest build of all my lego sets, and the most enjoyable. This set has so many pros, and so few cons, that I would really recommend it to any lego enthusiast with some building experience! (I wouldn't recommend this to someone with minimal experience, there are some parts to building where you really have to pay very close attention). This set seems extremely durable, and is extremely well built, and is really quite impressive, LEGO obviously spent a lot of time with many engineers designing the intricacies of this product, there is one motor that runs through two different transmission boxes to activate 5 different functions. It is extremely detailed. The design includes "clutches" for 4 of the 5 functions and this is where the only real flaw comes into play. For example, when extending the outriggers, once they have achieved the maximum distance the motor can still continue running without harming itself because a clutch disengages. The only problem is changing the angle of the boom, if you arent paying close attention to when raising or lowering it, if you max it out, you'll essentially stall the engine or grind gears, because there is no clutch for this function. All in all though I think this set is the ultimate building experience for any fan of the technic lego sets. It really is quite amazing.
Date published: 2013-12-28
Rated 5 out of 5 by from Very satisfied Bought this set for my 3 sons to provide a fun mechanics learning tool. My boys (11, 8 and 6) have always enjoyed Legos but have never gotten or shown any interest in Technic before. My past experience with Technic was from my teen years and only with sets that topped out under 300 pieces. This set exceeded my highest expectations, providing many hours of great fun by all, mechanical education and quality time building with my sons. My wife also enjoyed the many hours of quietly entertained children. For those concerned with the price, I was there too. As I alluded to above, my previous sets were relatively inexpensive, and consequently, limited my imagination as to what a top of the line set could provide. The experience is worlds different, I highly recommend partaking. I can't wait for next lead Technic set. Hats off to the design team.
Date published: 2013-12-27
Rated 5 out of 5 by from wow The only word I can think of to describe this set is, "Wow." It's huge, cool, hard to build, and packed with functions. I got it for Christmas and spent a huge chunk of the day building it, partly because I forgot a gear in the gearbox and had to start over so the function would work right. Because of this, I'd only recomend this set to someone who's been using legos for years(especially Technic). Now for real details. The truck: This is the first section of the model you build, and the instructions for it take up 3 books. At the front is a cab with 2 seats that are too big for minifigs to comfortably sit in.The doors on the cab open, but it's 180 degrees turn, which I think is a bit too wide. Behind the cab is a piston box. I don't think it's really nessecary for a crane to have a piston box, but the way it works is really cool. As you might have guessed, the pistons move as the wheels roll. Behind that, there's nothing (at least, until you put the crane itself on), so it could pass for a flatbed truck that for some strange reason has outriggers. Speaking of which, the outriggers work fairly well. The lowering takes a while and puts cool gear pistons to use. There are a total of 10 wheels, making 5 axles. A gear on the back turns the axles, steering the vehicle. About halfway across the truck there's a switch that controls whether the motor extends or lowers/raises the outriggers. the crane: Here is a really complicated gearbox. It's all concealled, of course, but building it is no easy task (what am I saying-building the whole model is no easy task!) and as I've said before, I had to rebuild it because I left out a gear. To my surprise, the battery box is on the back and is therefore easy to detach when you need to change the batteries. The motor, in case you're wondering, is right behind the cab, hidden by the "MK II" plaque. The cab, like the driver's cab, has an opening door. However, the crane cab's door opens only to a 90 degree angle, which is perfectly fine. When you're first building it, the huge amout of gears can really fascinate you. Oh, and there's a switch opposite the cab that lets you select which function the motor controls. It's simply amazing that 1 motor controls 5 individual functions. boom arm: This is the last thing you'll build, and the instructions for this part only take up 1 book (sorry I forgot to mention this, but the crane instructions take up 2 books). There's not really a whole lot to say here, but it does extend so you can reach higher heights. Building this, however, had me deeply confused, and therefore I did a whole bunch of fiddling to get it right. Overall, good set! Here's some pros and cons, just to sum it all up. pros a bunch of cool functions battery box is easy to detach actual steering too many things to put into words! cons outriggers lower annoyingly slow getting some things right may take fiddling At Lego.com there are instructions to rebuild the crane into a container stacker and truck. But since building the crane took so many hard hours, you couldn't pay me to take it apart. This set is completely awesome! It WILL impress your parents and grandparents (as well as your friends). It's awesome to have and will be the centerpiece of your collection. What more can Lego give?
Date published: 2013-12-26
Rated 5 out of 5 by from Great build. I really enjoyed this build. It was fun to see how the parts grew. At times, I couldn't figure out how the object I was building would work until it was almost completed. The engineering is amazing. And, the thing is SOLID. I can't imagine taking it apart to build the second option. I made two mistakes -- the same two I saw in these comments but did not recognize until I had already made them myself. First, I used two long gray supports instead of black in the outriggers. I didn't realize it until many, many steps later when I had only two long supports left, and they were black rather than gray (or vice versa). I managed to hide them fairly well instead of fixing it. I also had a problem with the gears on the outriggers, so I had two outriggers going out while the other two were trying to retract. I just flipped one of the gears to the other side rather than go back to fix it according to the instructions. Nobody but me will ever know about either mistakes, but some day, I may have to fix them the right way because I see them every time I look at it (even though I can't really even see them either). Overall, I think it took me about 20 hours, I think. 3 or so of those were spent backtracking at one point when I had to get the cord for the motor in the right place (as I said, taking this thing apart is crazy difficult!).
Date published: 2013-11-26
Rated 5 out of 5 by from The best Technic so far I have to agree with the previous reviews. This one is awesome. The best Technic set that I have so far. I also made the mistake with the black/dark grey 15 hole piece, but went with the flow and left them there as I was so far along at the time. I may decide to change them out one day, but it doesn't bother me. Sometimes it's not easy to distinguish the dark grey from the black pieces in the instructions.
Date published: 2013-10-28
Rated 5 out of 5 by from nice and One of the beste models with the unimog. The price is to high. I find the latest models to expensive. €125,00 is a fine price for this model. I bought it at a sale for €119,00 I would not buy it for the retail price.
Date published: 2013-10-25
Rated 5 out of 5 by from Don't go without this one This is a very technical build, requiring great attention to detail. I made a few mistakes resulting in disassembly of some parts. It took at least 8 hours, probably closer to 10. It's hard to put away when you're making great progress, but it helps to only do a little at a time. The detail is awesome, and shows itself when the build is done. The functionality is awesome. Some of the gearing is kind of slow, but it's fine. I only wish the whole vehicle was motorized, and could drive. Maybe in Mk III.
Date published: 2013-09-28
Rated 5 out of 5 by from Simply Amazing Such a fantastic model, even after watching tons of videos/reviews and a sneak peek at the instructions downloaded online, it still amazed me while building it. The model is extremely well engineered, robust and very sturdy. Had lots of fun playing with all the different functions. I loved how lego used a different kind of material for the wire which really improves the quality and the overall feeling of the model. The only complaint would be the boom raise/lower function since very other function is protected by the 24-tooth clutch gear but not the boom raise/lower function. I replaced the two 24-tooth gears in the superstructure with clutch gears and it works just fine which makes me wonder what made lego decide not to use the clutch gears. Anyway, it's still a very good set. I've always had fun with flagship sets but never as satisfied as I'm right now with 42009.
Date published: 2013-09-12
Rated 5 out of 5 by from A battle, but well worth it I've purchased and built a variety of the larger Technic kits, and to be honest, I underestimated the challenge behind this one. Yes, like most of the other larger Technic kits, the price is a bit over the top, but the overall kit is worth it. Over 2600 parts and 6 build manuals to complete to finish the kit. This is a BIG kit, but there's a definate level of satisfaction when you complete it. In my case, spread out over three days (evenings, and more than a little midnight oil), it came in around 10 total build hours. The complexity of the gearing is way beyond any of the other Technic kits, but the nice part is that this kit does include the power kit, so in reality, the package is $40 less than what you might assume. Overall, great build experience. My only negative impression (and its a small one) is that several of the instruction diagrams are less than clear as to where a particular sub-assembly is to be attached. If you persevere you can figure it out. Can't wait for the next kit... I'm hoping they introduce another large bulldozer to the series.
Date published: 2013-09-06
Rated 5 out of 5 by from Fun and Challenging. This is a very big and complex set. I had a few issues with the out riggers. Pay extra attention to the direction you place gears (book 2 page 39 & book 3 page 6) and make sure you use black 15 hole bars on the outriggers (book 2 page 21 & 56). I had to pull the crane section off and change the rear gears around to get the out riggers to work. The front was wrong but too hard to get to. The only thing wrong with this set is my building errors. I'm not going to be happy till i fix it all up. I'll get around to it .... one day.
Date published: 2013-09-02
Rated 5 out of 5 by from Great set When I first picked up the box for this set I thought that the bottom of the box was going to break because of how heavy all the pieces are! This set packs a ton of pieces and functions such as motorized boom, winch, and outriggers as well as manually opening doors along with 8 wheel steering. The length and height of the crane are quite impressive as well as the complexity of the build. All the functions work smoothly with the exception of lowering the outriggers. The outriggers raise and lower slowly but still work a little rough. The 3 section boom extends smoothly but while retracting it may stop until I manually move it. That usually only occurs when I do not have the boom raised though. I have no problems with raising/lowering the boom and working the winch. Overall I give this set a 10/10 since there are not any major flaws. This set is great and anyone who likes construction vehicles would like this set!
Date published: 2013-08-30
Rated 5 out of 5 by from Super crane This build was long ,but worth it altogether about 28hrs .this thing is huge, I've seen videos and seeing it built ,it was still bigger than I thought.all of th functions are cool and fun to play , sometimes instructions confusing but it was a blast to build!
Date published: 2013-08-22
Rated 5 out of 5 by from Fun, challenging, HUGE. Amazing set that makes the 8421 feel somewhat simplistic. The build was fun and challenging. The functions and the way it goes about activating them is pretty awesome. The outriggers aren't perfected (the LAs are quite slow and there is quite a bit of deflection), but that's only a minor complaint. Highly recommend!
Date published: 2013-08-20
Rated 5 out of 5 by from wow it's huge this the biggest baddest mobile crane ever! This box is big and heavy. it took me 2 and a half days to finish the main truck
Date published: 2013-08-15
Rated 5 out of 5 by from Wonderful design This is the 3rd technic set I build. Previous ones were 600 to 800 piece range. This is 3 to 4 times more and complexity is not linear. I may have taken a total of 24 - 30 hours spread over an entire weekend. I made a few mistakes that cost some time. When building the outriggers I used grey color beams instead of black. Realized it only when I needed an extra grey beam and then had to tear down the outriggers. That cost a few hours. This is an amazing machine. Since a single motor controls 5 different functions, there are a lot of gears and axles sometimes making you wonder what are they all needed for. Since there are 10 wheels and 4 pairs actually turn, making them all align during build is not easy. However, there is a build technique to do this which I found interesting. After building the superstructure and positioning it on the truck make sure to test out with battery to ensure noting went wrong. For me, the single axle that goes into the truck wasn't positioned properly but I pushed the blue pins on the sides and removing those to readjust proved to be difficult. I found that I could use a ball pen point and push the blue pins out by putting the tip into the small groves. While it's amazing that 5 different functions are controlled by a single motor, that also means constantly changing the red buttons to activate different functions. Getting rid of this by adding additional motors may not be easy. There are 6 books and first 3 are used for the truck, next 2 for the super structure and the last one for the crane arm. After building each of the 3 modules I was always left with some pieces. I wish there is a way to know what parts are spare to ensure no mistakes were made. Also, don't open all the parts, just open each of these 3 sets (marked as 1, 2 and 3) and build the modules and then assemble. Makes me wonder if LEGO will out do itself with another crane in the next 10 yrs. The current one seems pretty awesome.
Date published: 2013-08-12
Rated 5 out of 5 by from i wonder i used to help volunteer for the lego team, i built LEGO robots for a year, and competed in a tournement, overall i have one thing to say, i wonder if this could pick up my lego vw bus
Date published: 2013-08-09
Rated 5 out of 5 by from Best Bang for Your Buck! This crane is awesome. The power functions are good, minus the outriggers speed. Putting them down is extremely slow. If your looking at this review you should think about getting this crane. Its a great technic product for the more experienced builders.
Date published: 2013-08-09
Rated 5 out of 5 by from This is BIG I originally saw this in the product area for Technic. First thought it was decent. When I purchased it, the box was HUGE. And then came the building. 3 Days(Actually 6 or so hours over 3 days) later, and this thing is quite large. It is quite complex and very well designed, considering there is only 1 motor that powers 6 functions, all from the superstructure. Also, it is somewhat heavy, but thats for stability. I really like the intricacy of this model, and so far, this makes for my largest set that I own. Would DEFINITELY recommend.
Date published: 2013-08-04
Rated 5 out of 5 by from best kit yet this is the best kit yet so far,fun to build and play with.
Date published: 2013-07-29
Rated 5 out of 5 by from THE BIGGEST AND BADDEST MOBILE CRANE. This crane is the biggest with a record breaking 2,606 pieces. Many say this Lego set has the most pieces recorded on a Technic Lego set. When you hold the giant box, trust me its heavy. You can almost carry anything with this monster crane. So have fun. Oh one more thing, you need a lot of patience, it took me 3 and a half hours just to complete the main truck.
Date published: 2013-07-24

– More About This Product –

42009 LEGO Technic Mobile Crane MK II

42009 LEGO Technic Mobile Crane MK II

by LEGO®

Appropriate for ages: 11 - 16

Dimensions: 18.80000" H × 3.60000" W × 22.90000" L

Shipping weight: 3.5 lbs.

UPC: 673419191890