A few months back I thought I needed a replacement flywheel assembly (combination of flywheel and ring gear) so I did some research and found the following:
- The flywheels are different between spark ignition and diesel engines because of different timing marks.
- The utility tractors had an 11 inch clutch and the general purpose tractors had a 10 inch clutch.
Prior to serial number 8268200 those are the only two variables across the 430, 530 and 630 models. In other words a 430, 530 or 630 general purpose diesel tractor had the exact same flywheel / ring gear combination.
The 430s and 530s with serial numbers 8268200 and after had the same 11 inch clutch an flywheel as the 470s and 570s. I don't know what changed from the earlier utility models with 11 inch clutches but the part numbers are different. - Joe
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