Lego Power Functions Mini Tank (With Video)




Introduction: Lego Power Functions Mini Tank (With Video)

To see an updated version of this article, click HERE

This is an instructable for a small, remote controlled Lego Power Functions tank. The Lego Power Functions parts you need to build it are:
- (2) Small Motors
- (1) Batter Pack
- (1) IR Receiver
- (1) Remote Control

If you need Power functions, you can get them off the Lego Shop website. (Click the link)

There are several sets that include tracks and sprockets. You will need 4 sprockets and 36 individual track pieces. If you need tracks and sprockets, you can get them off of the Lego education website. (Click the link)

The rest of the pieces you should be able to find in most Lego Technic  sets. Feel free to substitute the pieces out for other colors that you like. This model should be able to be put together in 15-30 minutes depending on how long it takes you to find the pieces in your collection of Legos. 

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Step 1: Building the Frame

In this step I will show you how to build the main frame for the vehicle.

1) Build the section shown in the picture. Notice that one of the rods has one bushing on it and the other has two.
2) Build the same thing that you built in step one again.
3) Rotate one of the structures 180 degrees.
4) Add the two pieces shown in the highlighted box.
5) Insert two black pins into to 9 length beam as shown.
6) Take the structure that you built in the last picture and insert the pins into the the grey pieces that you added in picture 4.

Step 2: Installing the Motors

Insert the motors into the model. Make sure that the 5 length rods are inserted into the motors and that all 6 of the bushings are still attached. I highlighted all of the bushings with the boxes. 

Step 3: Installing the Battery Pack Mount

In this step I will show you how to build and install the battery pack mount.

1) Build the structure shown with a 7 length beam.
2) Build another one.
3) Install the structures from the last picture as shown.
4) Close up view.
5) Rotate them upward 90 degrees.
6) Close up view.

Step 4: Installing the Battery Pack

In  this step we will install the battery pack.


1) First, get you battery pack piece. Make sure that there is batteries in it before we start this step.
2) Look at the orientation of the switch an electrical port.  If that side isn't facing up, then flip it over so that it looks like the picture. This      will be very important in the end.
3) Now, insert 4 black pins into the battery pack as shown in the picture.

4, 5, and 6) Mount the battery pack as shown. make sure that it is centered on the model.

Step 5: Installing the IR Reciever

1) Start here.
2) Add a hassenpin.
3) Add hassenpin number 2.
4) Add a 3 length beam.
5) Add the receiver.

Step 6: Adding the Tracks

In this step, the model will start to look more like a tank.


1) Start here.
2) Add the sprockets.
3) Here, you  can add any sort of decorative gears. I chose to use the white 24-tooth clutch gears.
4) Same thing.
5) Use 18 track pieces...
6) ...and hook them around the sprockets.
7) Do the same to the other side.

Step 7: Final Wiring (FINAL Step) M

1 and 2) Plug the receiver into the battery pack.
3) Plug the motors into the receiver.
4) Build this.
5) Use it to pin the wires back. 

Step 8: Troubleshooting

The remote doesn't work.

          Make sure that the battery pack is on and that the remote and the receiver are on the same channel.

The switches on the remote aren't controlling the right motors.

          Switch which motor is connected to what terminal on the receiver. 

The tracks are going the wrong way.

          Fix this problem using the toggle switches on the remote.

The tracks are getting stuck and/or falling off.

          The tracks are probably getting jammed in-between the tracks. Pin the tracks back tighter with the piece that you built in the
          last step.

I will answer any more questions that you post as comments. I am entering this into the Toy Challenge 2 so if you like it, please vote. Thanks!

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    12 Discussions


    8 years ago on Introduction

    GASSYPOOTS, to embed video to your project, click the Embed button while you are creating your project and then copy/paste the embedding code from your YouTube video.


    Reply 8 years ago on Introduction

    no as in it doesnt have a cam on the tank so how will the tank take a video (the with video part)


    Reply 8 years ago on Introduction

    by (with video) I meant that my Instructable has a video, however, I have made rc cars with a camera before.

    dr. richtofen

    @1_TSD_1 (can't reply( Well, my mother won't let me buy any more lego. I have way to much (she also says that) So is there another way?


    Reply 8 years ago on Introduction

    If you can't buy more, then you will just have to pull them off of your bulldozer for a little while. They will be easy to take off and easy to put back on.

    dr. richtofen

    Haha, nice tank! I want to build it, but I don't want to take the tracks and wheels of my bulldozer (large technic set) Any way to replace them?

    I love the simplicity of this tank! I also like the troubleshooting page, nice touch :)