LEGO Technic - Mobile Crane MK II (42009)

Mobile Crane MK II (42009)

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Description & Features+

Get ready for the biggest, most complex LEGO® Technic model ever — the Mobile Crane MK II! Drive this 2,606-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 77cm 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.
• Features LEGO® Power Functions motor-powered extending outriggers, lowering feet, extending or raising crane arm and retractable winch
• Also includes a rotating superstructure, 8-wheel drive, 5 axles, 10 wheels and a detailed V8 motor with moving pistons, 8882 LEGO Power Functions XL-Motor and 8881 LEGO Power Functions Battery Box
• 2 models in 1: rebuilds into a container stacker and truck
• Extend the outriggers for increased stability
• Extend the crane arm over 30” (77cm) into the air!
• Steer all 8 wheels
• The engine pistons really move!
• Measures (with retracted crane arm and outriggers) over 8" (21cm) high, 23" (59cm) long and 5" (15cm) wide
• Container stacker measures over 20" (52cm) high with boom fully extended, 19" (50cm) long and 7" (18cm) wide
• Container truck measures over 3” (10cm) high, 11” (28cm) long and 3” (8cm) wide
• Building instructions for Mobile Crane MK II included


Available for Shipping to Grab & Go Locker
Available for Shipping to Canada Post
Age 13+
LEGO Technic
Toy Character
Product Identifiers
Walmart Item #
Model #

From the Manufacturer +

Ratings & Reviews+

LEGO Technic - Mobile Crane MK II (42009) is rated 4.6 out of 5 by 103.
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 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 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 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 Top technic Amazing! Super challenging kit. Possibly the beat technic flagship ever. It was at a great price with free shipping, however Walmart did not use an external box. If this was amazon you would have gotten an external box. Some of us like to keep the original LEGO box and not have it trashed with barcode stickers permanent marker and shipping scuffs.
Date published: 2014-03-02
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 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
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