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How to Make a LEGO Rock Crawler

LEGO includes a wide variety of sets, everything from something common, like a house, to something more specialized, like a rock crawler. The LEGO Technic model called Extreme Off-Roader is a versatile vehicle, large and agile and ready to climb any rocky-looking surface. The fully functional suspension in the Off-Roader is designed to mimic that in its larger rock crawling counterparts. The set includes instructions for a few alternatives, like a winch, pneumatic hook and powered motor.

Instructions

  1. Front Axle

    • 1

      Push a gray connector rod through the long end of a small L-bar. This bar is four holes long with one on the side. Attach two 1-stud round plates to look like headlights in the short end of the L-bar, and a black connector-spacer unit just beneath. Make two units.

    • 2

      Attach an axle fork to the side of a 1-by-6-stud brick using the gray connector rod with the L-bar. The short end should hang over the axle. Repeat with the other side of the brick.

    • 3

      Make the second axle bracket. Attach two more forks to a second 1-by-6-stud brick, using 2-stud rods. Place two 2-by-1-stud plates on the outsides and a 2-by-2-stud plate in the middle. Atop that, place a 1-by-6 stud plate. Attach this to the bottom of the axle bracket.

    • 4

      Attach a shock absorber to the black connector-spacer. This will push the axle forks downward, which is the correct position for them.

    • 5

      Build the front gearbox. Attach two rod extenders with a 2-stud rod, then place this inside one of the brick-boxes. Keep this in place with a 5-stud rod with a spacer on it. This long rod becomes the drivetrain.

    • 6

      Attach two bar-plates to this device. Push two black connectors into each of the bar-plates, and a double-connector into the box. Place two 5-hole bars on the connectors so they meet the top of the bar-plates.

    • 7

      Insert two washer-ended rods into a 3-hole bar. Place this bar through the bottom of the gearbox bars.

    • 8

      Attach the gearbox to the back of the axle bracket device. The black connectors attach to the upper brick, and the rods push through the lower brick. Hold the piece in place with two 3-hole half-bars on the lower rods.

    • 9

      Slide the saw gear onto the bars and attach a small gear on the drivetrain so it meshes.

    • 10

      Pierce a double-ball-joint socket piece with a gray connector rod. Slide two washers on the end of the rod. Make two of these units and attach them to the axle forks.

    • 11

      Attach two ball socket connection rods between each of the axle ends and the saw tooth gear.

    Rear Axle

    • 12

      Attach two 1-by-6-stud bricks together by sandwiching two 2-by-1-stud plates and a 1-by-6-stud plate between them. Push four black double-connectors through the second and fourth holes of each brick.

    • 13

      Attach a pair of axle forks to the bottom brick with a 2-stud rod for each fork.

    • 14

      Push a gray connector through a 3-hole rod and put a gray half-connector in the other end. Repeat to make a second part. Attach two more axle forks to the top of the axle bracket with them.

    • 15

      Make two more ball-joint axle parts. Attach them to the ends of the axle bracket as before. Connect a shock absorber to the top of the unit as with the front axle.

    • 16

      Attach two three-hole bars to the black connectors and place ball-joint connector pins in the center holes on the bars.

    • 17

      Attach two more ball-socket rods to the axles and pins, as you did on the front axle.

    • 18

      Build the rear gearbox. Attach a spacer to the end of a 5-stud rod, then push that through the center hole at the end of a brock box. Put a thin gear on the inside and a rod connector at the end of this. Attach another 4-stud rod at the end of the rod connector.

    • 19

      Place a second thin gear, a washer and a rod connector on the end of the 4-stud rod.

    • 20

      Place two more bar-plates on the end of the brick box, and place two double-connector pins in the top slots, then four black connector pins on the lower holes. Attach two 6-hole thin bars to each of the sets of pins so they hang below the gearbox.

    • 21

      Attach the gearbox to the rear axles with the double-connectors already attached.

    • 22

      Connect the front and rear axles with an 8-stud rod.

    Car Body

    • 23

      Build two side bars out of two 9-hole bars and a angled bar. Attach these bars to the side of the car with black pins.

    • 24

      Attach a curved bar to the back of the rear gearbox, with the long end of the bar pointing upward at a 45-degree angle.

    • 25

      Build a seat with a center control knob on the top. The control knob should extend above the seat and attach to the curved bar with a 10-stud rod. At the bottom of the control knob axle, a thin gear meshes with the gearbox.

    • 26

      Attach a second curved bar to the side of the car so the short end connects to the side of the car. Repeat both of these curved bars on the other side.

    • 27

      Build an engine block using the hood scoop piece and two ladder plates. Use the ladder plates, attached to a 1-by-4-stud plate, two 1-by-2-stud bricks with cross slots, and a second 1-by-4-stud plate to create a grill. Attach this behind the bottom of the hood scoop using a black four-end connector and two 1-by-2-stud double-holed bricks. Attach the engine to the vehicle at the front of the car.

    • 28

      Attach the wing accents to the sides of the model, as well as the steering wheel.

    • 29

      Attach the tires to the four axle points. When you twist the control knob, the car's front axle will turn.


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