The thicker one is probably a viscus fluid type while the original on the tractor was a rubber cushion style.
I would use the new one from CIH.
There were things upgraded from the first production models. the woodruff key was made longer with steps to keep the key from sliding out of place while installing the pulley. If it comes out of place it will crack the new damper pulley. There was a thin sealing washer added between the pulley and the oil pump to keep oil from leaking between the crankshaft and pulley. There was a plate added to the front to keep dirt from being blown back into the seal by the fan.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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