How to Overhaul a Bicycle Hub Gearbox Without Dismantling

Step-by-Step Guide

1. 1

   Step 1: Obtain 15 mL ATF (Automatic Transmission Fluid = gearbox oil for automatic-driven cars).

   The chain-driven side should be facing upward to you as you stand over it., Hubs with more than three gears may have other positions for lowest tension; see the manufacturer's manual, or you can look online. ,, Place it on a clean cloth.,,, Turn the chainlet in the hole (clockwise) until it won't move anymore.,,, Three-gear-hubs will be adjusted by shifting on position "3"
   
   as here the tension is lowest. ,, This involves mostly a "ring" with an inner thread., Mostly it will work as brand new, as the long-time grease lumps are dissolved.
   
   Many incorrectly working hubs have only lubrication problems and are mechanically fine and undamaged.
2. 2

   Step 2: Lay your bike with the left on an old blanket.

3. 3

   Step 3: Operate the highest gear to get the shifting wire to sit without tension.

4. 4

   Step 4: Turn out the petty shifting chain by turning it anti-clockwise.

5. 5

   Step 5: Remove it.

6. 6

   Step 6: Pour the ATF into the hole of the rear hollow axle of the shifting chainlet.

7. 7

   Step 7: Wait for 20 minutes for the reaction.

8. 8

   Step 8: Repeat  the repair steps in reverse.

9. 9

   Step 9: Turn it ever so slightly anticlockwise to avoid mechanical damage.

10. 10

    Step 10: Connect the chainlet with the shifting wire

11. 11

    Step 11: mostly a sleeve with an inside tapped thread.

12. 12

    Step 12: Adjust the shifting system as described in the manual.

13. 13

    Step 13: Enhance the tension by turning the adjusting sleeve until it is at a very light tension.

14. 14

    Step 14: Fix this position now by adjusting the sleeve with the counter-nut.

15. 15

    Step 15: Start driving the bike and shift it.

Detailed Guide

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