By Steven Doetschman — fitness equipment technician and owner, Krislynn.comThis video covers removing a cotter (wedge pin) crank — the style found on older Schwinn Airdyne models. Steven Doetschman uses an adjustable wrench, a hammer, a small block of wood, and penetrating lubricant to drive the wedge pin free from the crank arm. He sprays lubricant into the space around the pin, places a wood block over the nut, and taps it out carefully. Once the wedge pin is out, the crank arm slides off the bottom bracket spindle.
Full transcript
hi my name’s Steve and today I’m going to be showing you how to remove a Cotter crank and a wedge pin from a Schwinn airline or an exercise bike so that you can perform repairs pause first thing that we’re going to need for our job is lubricant the next thing we’re gonna need a little block of wood third thing and open-ended wrench or an adjustable wrench and fourth we’re gonna need that let us begin first we’re going to unscrew the nut on top of the wedge pin until you have a space between the wedge pin and the crank there’s a space right there what I want you to do that take some lubricant and spray it inside of the wedge pin and tap on it with a hammer to make sure that the lubricant goes in and around the wedge pin before we remove it then unscrew the wedge pin a few more turns and if you look in the top of the wedge pin you can see that the top of the nut is no longer sticking out of the wedge pin what we’re going to do now is take the block of wood put it on top of that nut and hit it with a hammer and as you can see the wedge pin we’re going to unscrew it some more then we’re going to take a block of wood and we’re going to hit it again the wet pin pops out the crank arm comes off and here’s your wet pin and you’re not still in good condition that’s how you remove a wedge finish one aired on
