Tastes differ, and while some fans are madly in love with the designs of the recent supercar sets, others are delighted with motorised functions of the flagship builds. Whichever side you take, it’s hard to argue that any heavy LEGO Technic set is a brilliant source of pieces for future creations. 42055 Bucket Wheel Excavator released in 2016 became the biggest LEGO Technic set at the time with 3929 pieces. Now, 2 years later the Crane sets a new record of 4057 pieces. Moreover, today, 4 of the 5 largest LEGO Technic sets are available in stores: 42056 Porsche 911 GT3 RS, 42083 Bugatti Chiron, 42055 Bucket Wheel Excavator and 42082 Rough Terrain Crane. Let’s have a look at the numbers and compare these 4 massive sets:
Since the 1950s, the Lego Group has released thousands of sets with a variety of themes, including space, robots, pirates, trains, Vikings, castle, dinosaurs, undersea exploration, and wild west. Some of the classic themes that continue to the present day include Lego City (a line of sets depicting city life introduced in 1973) and Lego Technic (a line aimed at emulating complex machinery, introduced in 1977).
➡ #42054 LEGO TECHNIC CLAAS XERION 5000 TRAC VC: What really stands out with this vehicle is the color-scheme; the lime-green, red, and white combination really pops and makes this an impressive display-piece. But there is more. The model is also motorized the raise and turn the cab and to operate the crane, and there are a number of hand-operated features as well. Unfortunately the model can’t pick up any heavier weight (not even a banana), as you can see in the video-review below, and the alternate model is just a rebuild of the attachment, but it is still a very cool looking set.
Lego Technic system expands on the normal LEGO bricks with a whole range of new bricks that offer new function and building styles. The most significant change from normal LEGO is that single-stud wide bricks ('beams') have circular holes through their vertical face, positioned in-between the studs. These holes can accommodate pins, which enable two beams to be held securely together side-by-side, or hinged at an angle. The holes also act as bearings for axles, on which gears and wheels can be attached to create complex mechanisms. Stud-less beams ( studs are the bumps traditionally associated with Lego parts), referred to as 'liftarms' were first introduced in 1989 and through the 1990s and 2000s and increasing number of liftarm designs have been introduced over time.
The primary advantage of studless construction is the addition of new construction methods that were previously unavailable. Liftarms are exactly 1 unit width high, in contrast to studded beams, which are a non-integer multiple of one unit. It can be awkward to use studded beams in vertical structures because it is necessary to insert plates between the studded beams in order to get the holes to line up. Studless beams allow greater flexibility when building in multiple dimensions, while remaining compatible with "classic" studded beams. Some builders also believe that models constructed with studless beams look nicer than their studded counterparts. 
Actually, I love the purpose of stickers in this set. They do not influence the shape of the crane, but rather fill empty spaces and emphasise things that need your attention. For instance, a whole bunch of pinch point labels are placed by the exposed gears on top of the tower. Hiding gears inside the body would cost space and panels, and stickers help to solve this problem in a very elegant way.
The Znap line was an obvious reaction to K'Nex, an American construction toy company that was founded in 1993. Like those of K'Nex, Znap pieces were more elaborate than traditional Lego bricks, and could allow for more architectural creations, like bridges. Ultimately, Znap proved to be an inferior competitor and failed to catch on. To make matters worse, Lego even used those highly unprofitable Technic motors in some of the sets.
What LEGO Technic set you choose to buy depends largely on the kind of person you are buying for. The beauty of LEGO Technic kits is that there isn’t really an upper age limit – they can be enjoyed by kids and adults alike. That being said, some of the kits do have a lower age limit and these should be adhered to unless you are looking to buy a Technic LEGO building kit to build together.
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You might have spotted a couple of white rubber bands right in front of the battery box placed between two thin yellow liftarms. Their function isn’t as obvious as the other parts of the crane, but they are crucial for the model. These bands do not transmit any rotation, but instead create additional friction for the axles they are banded with. Because of the size of the model and considering a really long boom, some mechanisms may accumulate unwanted stress concentrating in numerous connectors and gears. This stress may result into backing run, especially when the gearbox is switched to neutral. The rubber bands help fight any reverse rotation by keeping the axles in set positions.
In 1989, the LEGO pneumatic line was revamped, and a new cylinder and pump piece were introduced. The old cylinders and pumps were discontinued. The chief difference is that the new cylinder had two input valves now, which allowed both pushing and pulling without needing complex circuits involving the distribution block piece. The Generation 2 cylinders also had metal rods so that they more closely resembled real hydraulic cylinders.