The rear derailleur of a bicycle is one of the main components, on the correct operation of which the convenience of using the entire bicycle depends. If the switch fails, then the gears constantly "jump" during the movement, and this can even lead to a fall. This is why the bike's rear derailleur must be set up correctly and fully function.
Necessary
- - A set of hex keys;
- - Open-end wrench or key-bone;
- - Pliers;
- - New cable for the switch (in case the old one has fallen into disrepair);
- - Graphite grease;
- - Nippers;
- - Phillips screwdriver;
- - Rag for cleaning parts and hands.
Instructions
Step 1
Wipe down the rear derailleur and remove any dirt. If grass or twigs are crammed into the switch, be sure to remove them before starting repairs.
Step 2
Turn the bike over and place it on the handlebar and saddle so that you can pedal freely.
Step 3
Remove the hex screw or cap screw that holds the cable down. It is very easy to recognize it, since the cable fits exactly there, and this is one point for the entire switch.
Step 4
Take the released cable in your hand, examine it carefully. If the cable is intact, it has not been damaged, it does not unravel, all the fibers are in order, and there is only a small mark on the cable, then go to step 5. If the cable is damaged, it must be replaced with a new one.
Step 5
Hold the cable with your hands, switch the lever on the handlebars and see if the cable moves with each click. If there are no dips or wedging in the cable, proceed to the next step. If the cable gets stuck somewhere, you need to remove the jacket from it and grease it with graphite grease.
Step 6
Put the shirt back in place. Set the cable aside. Go to the switch. There is an L and H screw on the switch (they are signed on most models).
Step 7
We rotate the bicycle pedals. Since the cable is not locked, the chain must move to the end position. If this does not happen, turn the screw L with a screwdriver (in both directions, we look at the situation) until the chain lies confidently on the extreme star. No deviations allowed!
Step 8
Only after step 7 is performed correctly, do we move on to tightening the cable. The cable rests against a special thrust bearing on the body (so-called fine adjustment). Before inserting the cable back into its position, the thrust bearing must be tightened almost completely, leaving 2-3 turns free.
Step 9
We insert the cable into its position. Using pliers, pull the free end, tighten the cable and fix it with a nut or hex bolt. Everything is almost ready. It remains to adjust the H.
Step 10
We shift the gear to the last, largest rear sprocket. Ideally, the chain should switch freely and stay on this star. If clicks occur, or the chain does not lie on the star, it is necessary to turn the screw H left and right with a screwdriver to find its optimal position. If you set the position incorrectly, the last gear will not engage, or vice versa - the chain will fall between the cassette and the hub flange.
Step 11
There is also another bolt on the switch, which most likely will not be required. It determines the longitudinal position of the switch. It is easy to find as it is located close to the switch axis and rests against the cock. This bolt only needs to be turned if the chain slips under load while driving.
Step 12
The task is completed, your switch is configured. It's actually very simple, so don't be afraid to repair the switch yourself.
