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Step 6Assemble the gearbox
Check the cogs first. Sometimes they have little bits of plastic in between the teeth, which will stop the gears turning properly. If so cut them out carefully with a knife. The small cog goes on the motor and the others are used in the gearbox. One of these is a spare so don't worry about having a cog left over.
Push the smallest cog onto the motor shaft so that the teeth are on the top. Then carefully fit the motor inside the bottom black casing.
Put one of the big cogs onto the little black peg next to the motor with the big cog at the bottom and the little one on top. Check that the small motor cog meshes with the new cog.
Then put another of the cogs onto the other black peg and check that this meshes with the previous cog.
Push one of the cogs onto the metal shaft about half way down.
Fit the metal shaft in the gearbox so that the big cog is on the bottom and the small cog is on top. Check that everything still turns smoothly.
Finally, fit the top of the gearbox on and push it together round the edges. This can be quite stiff, but look to see where each of the 3 pegs locate and give some good pressure there.
Make sure that you can easily turn the long metal shaft and the gears all move smoothly inside. If you can't move it easily, the motor won't be able to turn it either.
Then push the motor into hole in the gearbox and test it again. You should see the shaft moving like in the video:
http://youtu.be/YR4wnIjNZGE
Push the smallest cog onto the motor shaft so that the teeth are on the top. Then carefully fit the motor inside the bottom black casing.
Put one of the big cogs onto the little black peg next to the motor with the big cog at the bottom and the little one on top. Check that the small motor cog meshes with the new cog.
Then put another of the cogs onto the other black peg and check that this meshes with the previous cog.
Push one of the cogs onto the metal shaft about half way down.
Fit the metal shaft in the gearbox so that the big cog is on the bottom and the small cog is on top. Check that everything still turns smoothly.
Finally, fit the top of the gearbox on and push it together round the edges. This can be quite stiff, but look to see where each of the 3 pegs locate and give some good pressure there.
Make sure that you can easily turn the long metal shaft and the gears all move smoothly inside. If you can't move it easily, the motor won't be able to turn it either.
Then push the motor into hole in the gearbox and test it again. You should see the shaft moving like in the video:
http://youtu.be/YR4wnIjNZGE
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