The most likely cause for you problem is hardening of the O-ring seal between the center section and the rear frame.
The oil passage between the filter and the MCV pump goes above the normal oil level where the two housings join together. With age the O-ring will harden and take a set so that it will not seal properly. Air enters the suction side of the pump and as the pump starts to get worn it no longer is as efficient at pumping air as a new one. Adding enough oil to ensure that this O-ring is below the oil level will keep air from entering the suction side of the pump and the symptoms will disappear.
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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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