I've had a C-125 for around 4 years I think. May be a bit longer. It's used every year, cutting the green opposite our home and the verges. The deck I did have to extensively rebuild, due to POs negligence to clean after use.
Apart from oil changes and replacing the track rods and spark plug, all I've done is fit a boat primer bulb. Helps with starting if not used for a while. If your going to use it as a tractor, fit ag tyres like a tractor.