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8421-1: Mobile Crane

There is also some strings with 1 stud on each end, which will be used to extend the boom. This sure has lots of playing features. The colour separation in the instructions are excellent. The middle axle holds the differential which will power the engine.

Placed here along with some decorational “Vehicle Grilles”.

It features 4 extending outriggers, six-wheel steering, and a fake 6-cylinder engine. Great Crane, the only issue I have is the string is too thick and keeps catch when wound up. A “Black Bionicle Bohrok Shoulder” is used to keep 8241 top and bottom from falling apart. I have many parts sorted into compartment’s It’s connected to the driveshaft differential via a 16T clutch gear. A little gear rack for the back axle. To lock the steering axle in place, this contraption is made.


I only dissassembled it again when the came out.

Another gear rack to extend the steering to the first axle. Some liftarms ties the back end together. The lower handle controls the changeover catch. Which, in my opinion, is a big advantage. I saw another thread for buying bead 4821 to use with lego contraptions, but I didn’t buy any. Posted November 16, Rather than having them named book 1 and 2, they kego greyed out the part that’s not present in each book.

The inclusion of a fake engine is a nice plus. The 6-wheel steering is really smooth for the size of the model, it almost seems weightless.

Share this post Link to post Share on other sites. Two pneumatic hoses are joined to simultaneously apply pressure to both. These four ,ego the attaching pins for the Crane superstructure.

The axles for the outriggers are extended to the front side of the truck. Note the 8T gear above the worm screw.

LEGO SET 8421-1 – Mobile Crane

The crane has its own cabin. Comparison with, I have been trying other strings to get a better fit. Lfgo a great set and one of the first with a 3 piece boom.

Two strings with studs are attached on the far side of the secondary boom. This is the final lenght of the crane truck. The primary boom is next.


That makes for an average parts-per-step ratio of Next is the sides, which do leg open in this model. The RC motor is able to drive two axles at the same time. I would love to get some re-created.

Peeron: Mobile Crane / Crane Truck (#)

This cage will hold the turntable in place. You can see how the winch line will go through the two perpendicular axle and pin connectors. The crane base requires some reinforcement to cope with all the weight of the crane itself. The seconday boom is next. And this at step Another gear rack is made to extend the driveshaft and steering rack. Already have an account? In addition, I add in pneumatic tubes to close off the circuit the set already comes with an extra t-pieceto smoothen the descent of the crane arm.

Next is the cocpit.