AMX Bottom Bracket Service
This is a guide on how to service your AMX Bottom Bracket. The AMX Bottom Bracket have a built-in pedal sensor, which makes his service slightly different than a normal bottom bracket as there is a cable sticking out of the shell.
Below is an AMX bottom bracket.
1. Remove the Crankset
Use an 8mm hex key to remove the bolts from each side of the crankset.
Use a crankset extractor tool (we use the Park Tool CCP-22 in this guide) to remove the crank arms on each side.
2. Remove the Bottom Bracket
It is helpful to use a tool that can be used to remove wires from inside the frame. We use a Wheel Spoke or a modified Coat Hanger if we don't have a spoke to hand.
Hook the pedal sensor cable and gently pull it out of the downtube hole. The pedal sensor has a flat cable.
Once you can see the pedal sensor connector, gently disconnect it. The inside of the connector is yellow.
Unscrew the left Bottom Bracket cup, the non-drive (left-side) cup unscrew by turning counterclockwise.
You can then gently slide the Bottom Bracket from the left side
3. Install the new bottom bracket
To install a new bottom bracket, first slide the pedal sensor cable inside the pedal sensor hole in the bottom bracket shell. You might want to give yourself a bit space by loosening cables around. Use your spoke or hook to do so.
Here is the list of cables:
- Rear brake cable
- Motor cable
- Pedal sensor cable (flat cable)
- Rear light cable (the one with a spiral cable) and front light cable, which are both connected to the Light Controller
Once the cable is in, carefully push the bottom bracket inside the shell while gently pulling the sensor cable out. Make sure the cable is facing upward when you push-in. The bottom bracket body has a notch that can slide in multiple positions in the right cup, gently rotates the bottom bracket until it slides fully in.
Once it is fully inserted, you can re-connect the pedal sensor cable. Leave the cables out for now.
You can then screw the left cup back on. Before you put it in, grease the threads. That will prevent water to get in and make the servicing much easier the next time you have to do it.
Use one of the crank arm and test if it is working, if the motor kicks when you turn the BB, you can then tuck back the cables. This is how it should look when it's done:
You're all done, you can then fit back the crankset.