Early tractors were all pretty basic pulling and belt driving machines. My extended family had a lot of different machines from the big Frick Eclipse steam traction engines to the International Harvester & McCormic Deering tractors. They were state of the art in the eras that they were functional in. None of them would be considered for use in a major modern farming operation. My Grandfather's IHC F-20 and McCormic Deering 2236 tractors ended up out to pasture when my Pop went with the modern John Deere tractors after using several Case and Minneapolis Moline units in the early 50s. Pop's first Ford was the UK made Fordson New Major in 1956. He replaced it with a Ford 5000 back in 64 but they were only used for lister type planting or pulling smaller grain drills. The big JDs did the heavy work of plowing all the acreage we have.
Believe it or not, there are parts available for those models and the old Fordson Model F and N tractors. The Fordson House is one source. The old Frick Eclipse, not so much but folks that collect them manage to keep some of them running. The flues and fire boxes take a beating but some sources will fabricate parts to replace the stuff that wears out.