You will need
  • Wrench, "family" key.
Here are some specific steps you can do to adjust derailleur on the bike by yourself:First install the shifter in the first speed. Flip the bike, ie put it on the steering wheel and the seat. Next, clean the lever from contamination (grass, dust).
Using screw "Lo" or "-" adjust the position the bracket so that it was close to the plane of the gear of the 1st speed. To achieve this effect, just slowly tighten it from the top and check the position. If there is a shift of 1 mm, then it is acceptable. Although it will be harder to switch speed.
Here's what you need to do next: pull is not much the cable actuator switching speed. Make it SAG. And at the same time be sure to set the first speed. Then switch the speed to the highest, and make sure to have it on the lowest (smallest) sprocket.
Install the chain on the top (biggest) star in the front pedal. Adjust the position of the screw with the words "Hi" or "+". Do this to ensure the position of the two stars in a single plane.
By doing this all, check out how switching speed. If still unsatisfactory, it means that you have incorrectly adjusted the screw high transmission. If you switch to the 1st speed and the chain flies from the carriage due to the screw first gear. Try to fix it again.
And best of all, of course, take your bike to a specialist shop. Now this adjustment is worth a penny, but will save you a lot of time, effort and nerves. Besides, if you have a warranty card after purchasing the bike in a specialty store, please feel free to go there!