How do you replace attachment clutch assembly for 917.287050?

Hi,
I fail to understand your question. At first, I thought you must have an electric PTO clutch. SearsPartsDirect was down yesterday and a check of the manual did not show it but it did not have a parts breakdown. The parts site is up and your machine has a double stack sheave on the engine crank. Are you asking how to replace the cable?
Peace,
Clarke