You will need
  • tools, new bearings
If we talk about the bearings, they are the most vulnerable part of the bike. The vehicle has several bearing units. They are in the front fork and in the saddle, the pedals and the wheels.
This files most often out of order, bearings in the carriage which provides the rotation of the pedals. This bearing unit is at the bottom of the frame.
Suppose you need to get to the bearings of the carriage. Flip the bike and remove both connecting rod. For this purpose, the wedges loosen the nuts and remove them. Note that all work must be performed slowly, so as not to confuse nuts and Bicycle parts.
Sometimes loosen the nuts very difficult. In this case, set the wooden bar to the threaded part and tap with a hammer. Please note that the work should be done without effort not to damage the nodes of the bike.
After you remove the anthers. You should clean it thoroughly. Pollution and effects of water quickly eliminate the bearings in the carriage down.
Install in the grooves of the carriage, a special key and remove the left Cup. Pull it together with the bearing. Gently pull it out of the slot of the frame. Then replace and perform all operations in reverse order.
After completion of the Assembly process to adjust the bearing. The connecting rods should rotate freely. The axial displacement should not be.
If you have decided to replace the bearings in the front fork, remove the wheel. Then gently Unscrew the head of the bolt holding the steering wheel. Remove it by unscrewing the locknut.
Under the nut is a light hook or washer. Remove it, then Unscrew the top Cup. You will gain access to the clip that holds the bearing.
On some models of Bicycle balls in the cups are without cage. Because of this, you should be sure to hold the plug crown at the moment of loosening of the locknut. So balls will not fall apart.
By removing the top Cup, tilt the bike to one side. So you can gently pour the balls. Then remove the plug from the head pipe.
Dismantling the plug, flush with kerosene cups and balls. Wipe dry.
Buy petroleum jelly and smear it thickly over the Cup. If you saw at least one balloon popped or rusted, change the whole set. The fact is that the difference of the diameters of the balls leads to their rapid wear.
Completing Assembly, carefully lay the balls in the track of the Cup. Then enter the pipe frame stem fork and press it to the bottom of the Cup cone crown.