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LEGO models my own creation MOCpages toys shop 8421 Mobile Crane Version2Technic
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8421 Mobile Crane Version2
This fully functioning remote controlled 8421 Mobile Crane is a revised version of my previous 8421 Crane. Many mods went into this one. My main goal was to have the crane section rotate 360 which I accomplished but ended up almost revising the whole crane. This required mods to both sections of the crane. This crane has 2 battery packs, 4 IR recievers, 1 XL motor, 4 Remote IR Transmitters and 6 M motors. This Crane is fully functioning and fully Remote controlled through IR recievers using all Lego power functions. It has lights and 2 linear actuators. As before, the pneumatics just don't function in a way to be used on this Moc. The Boom is lengthened from original to 36" long once fully extended. The crane moves forward, backward, steers right & Left, stabilizers drop & lock and retract, boom raises lowers, extends and retracts, and hook raises and lowers. Again all functions using Power functions IR equipment. This Moc weighs in over 7 pounds. I hope to soon have video of this Crane in action.
About this creation

Front view of the cabin area.




View of the rear of the crane with stabalizers extended and crane rotated 180




Crane rotated just about 90 with a view of inner workings.




Front hood opened to reveal battery box for mobile section which powers mobility, steering, stabalizers and rotation.




Top view of mobile section with crane removed. Crane is easily removed by the stock 4 push pins.




Close up of inner workings with crane removed




Bottom view of mobile section.




Bottom view of crane




Crane & Mobile section side by side. The plan is to build the optional boom platform so the crane has 2 options.




Rear shot of Mobile Crane.




Another rear shot, you can see the XL motor, the 2 m motors fit along eah side of the XL motor.




Top view of the crane's radiator section and exhaust stack




The radiator also serves as access to the battery pack for the Crane which powers boom up & down, Boom extension and retraction, and hook raising and lowering.




Passenger side view of 8421 Mobile crane.




Drivers side view of 8421 Mobile crane




Here the boom is fully extended, 36 inches long.




The crane sits at 180 rotation with a load on the hook.




Comments

 I like it 
  December 10, 2013
wow thats amazing! you could make a crawler crane by making a tracked undercarridge and putting the crane on that
 I like it 
  September 30, 2010
Unbelievable!! All the technical functions in one model... and it's not THAT huge... WOW!! I'm impressed.. You're genious!
 I made it 
  September 29, 2010
Quoting Trombone Mkinnon Awesome!!!! Looks even better than your previous build. Sweet!
I do plan someday to put an XL motor in as the drive motor - It really needs it. Thanks again for the kind words
 I like it 
  September 29, 2010
Awesome!!!! Looks even better than your previous build. Sweet!
 I like it 
  June 9, 2010
Very impressive, 8421 is a great model, you've inspired me to take a bash at RCing mine. I very much like how you've filled out the body on yours, very realistic looking, it's something I'd like to do with my heavy wrecker. Please take a look and feel free to comment, it's similar in some ways, filled with ridiculous amounts of PF functions, fully RC and hopefully realistic in both looks and functions. Good work, well done.
 I like it 
  March 26, 2010
Fantastic! I would also love to see a video.
 I like it 
  March 12, 2010
Super..... Fantastic, excellent work. Can you make a movie and put it on youtube.... I would love to see it work. Superrrrr.
 I made it 
  March 11, 2010
Quoting Ben Schevers incredible how you fitted all those motors, batery's and receivers in your model. You made it look very smooth also. Great upgrade.
Thank you! I made a mistake in the number of M motors in the Crane, there are 6 M-Motors - I have fixed that.
 I like it 
  March 11, 2010
incredible how you fitted all those motors, batery's and receivers in your model. You made it look very smooth also. Great upgrade.
 I like it 
  March 5, 2010
WOW a lot of work is in there. it does everything. how does it feel to hold 4 ir contolers in your hands just to use it.
 
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