Scope: This is the traditional 3 piece crank (left crank, right crank and bottom bracket axle). You need to remove the cranks before you can get at the bottom bracket.

They have a cut-away so you can understand how the crank puller works. First he takes out the crank bolt, but the crank is still tight. It is still jammed onto the spindle. To unjam it, you need a crank puller. The crank puller consists of an outer part that threads into the crank, and an inner "spindle". You thread in the outer part, then turn the Spindle driver inward. It pushes against the axle and extracts the crank.

Reassembly: You put the arm back in place, then tighten the bolt to press the crank onto the square taper. The bolt acts as a "press".

It shows the tools such as Crank Puller.

Date: 2015.09.23

Parts:
  Crank bolt
  Dust cap