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You will need

• - puller;
• - wrench;
• - adjustable wrench;
• - Clean rags.

Instructions

1

Set the bike vertically (you canlean it against the wall). Prepare a key and a special puller for an asterisk. You will also need a clean rag. It is convenient to place the dismantled parts on a sheet of an old newspaper to prevent contamination.

2

Start work by detaching the connecting rods. Unscrew the blade nut 3-4 turns. Place the connecting rods in a horizontal position. The big head of the connecting rod is supported from below. Loosen the blade, applying a few weak strokes on the blade nut through a pre-prepared wooden strip.

3

Unscrew the nut, remove the blade and remove the rightconnecting rod. A similar operation and with the left connecting rod. The front sprocket is usually mounted on the right connecting rod as a single unit. On some bike models, the star can be attached by several bolts. In this case, unscrew the fasteners and release the star from the carriage.

4

Some constructions of sports and roadbicycles assume the use of a special puller when dismantling the asterisk. After unscrewing the fixing bolt, insert the puller and use the adjustable wrench to release the sprocket securing mechanism.

5

For preventive maintenance it is necessarycomplete disassembly of the entire node. With the connecting rods removed, unscrew the lock nut, then the left and right cups. Take into account that the right cup has a reverse thread, so rotate it to the right. Remove the shaft and separators from the carriage.

6

After dismantling the entire assembly, carefully inspectits elements. Clean them from the old grease and make sure that the parts do not have visible defects. If damaged, replace the parts in good condition. Apply new grease to the carriage parts. Assembly of the assembly is carried out in the reverse order. When assembling, be careful not to let sand and dirt get into the mechanism of attaching the front star.

Tip 2: How to unscrew the nut

One of the most unpleasant features of metal nuts is the rusting of their threads. Unfortunately, it is almost impossible to avoid this process. Unscrew the rusty nut pretty hard. You can do this using several proven methods.

You will need

• - kerosene;
• - sandpaper;
• - a hammer;
• - soldering iron;
• - plasticine;
• - water, sulfuric acid and zinc;
• - The chisel;
• - wrench.

Instructions

1

Moisten the surface of the nut and the protruding partbolt, screwed into it, with kerosene. To do this, apply a gauze or cotton swab soaked in it to the parts. After a while you will notice that part of the rust has dissolved. Rusted parts of parts that did not respond to kerosene, thoroughly clean with sandpaper and try again to turn away nut.

2

If you turn away nut still did not work, tap on the sides of the part with a hammer. After such actions the rusty nut, as a rule, is easily enough unscrewed.

3

There is another way to unscrewa rusty nut. Preheat the part with a soldering iron. As a result, the metal will expand, and rust will collapse. In order to speed up the process of unscrewing the nut, drip into the gap between its thread bolt kerosene.

4

You may also need clay. From it around the rusted part, make a small ring-shaped guard so that there is enough clearance between the nut and the plasticine ring, and the ring itself rises above the rusted nut by about half a centimeter.

5

In the resulting plasticine "bath" fillwater, previously acidified with sulfuric acid. Next, place a small piece of zinc in it. As a result of the interaction of water, acid and zinc, a chemical reaction will occur that can cope with rust for a day. After this period of time, you will easily turn away the "stubborn" nut with a conventional spanner.

6

Unscrew the rusty nut it is possible and with the help of a chisel. This method is rude, but effective enough. On the faces of the nut using a chisel, make a few notches. The internal diameter of the nut will increase, and it can be turned off without problems. True nut for later use will become unusable.