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.
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.