Hi, I am new to the forum. I had a S250 and when work went, well, stopped, I sold it and bought a used 743 to keep around the house. It is a 90's model and has 1100 hours. I am changing all fluids and cleaning out the chain case to find I have three broken chain link bushings. The link is not broken, just the bushing. Will I have to replace the chain? My tractor did not come with a service manual. Thanks I hope someone has some helpful advice. Great forum guys!!!