Jack and block the machine up in the air and look under there. I think there is 2 chains, one from the hand steering wheel shaft to a jackshaft and then one from the jack shaft back to the steer wheel. It is #40 roller chain. There a special adjuster that attaches to one end to adjust it to the proper slack. It just uses regular connector links to connect it. It's a fairly easy job once you can see under the machine by getting it up in the air.