What is the motor coupling and how do you repair?

The motor coupling joins the shaft of the motor base to link to the agitator . un plug machine , remove capacitor - this is usually not near motor it is usually under control panel at top of machine it is cylinder shape and usually white or black an has between two and four wire plugged in to it . it looks like a battery and will have a number eg 10 uf .. If only two wires reinstall either wire either spot .if more than 2 mark them for reassembly . leave capacitor out and disconnected while working on machine for you safety even when machine unplugged ...it stores a charge !!!!!! Now to replace coupling ..... Remove motor . take top off motor . look at it and see shaft in center . coupling will be in two price with rubber or similar to cushion between each piece . the two halv s of coupling will obviously slot together in opposition to each other .replace both sides of coupling and rubber cushion . it will be obvious how to install. Reinstall top to the motor , bolt motor back in . check wire harness is clear of moving parts . reinstall capacitor . plug in machine and wash your clothes happily once again. I suspect you have a whirl pool machine as this is that machines common fault . have fun . not a hard job.