Jim is on the right track for you. The coupling is not heavy enough for the load. Alignment is also critical for coupling service life. Look at the attaching end at the crankshaft also. What holds it in place just another one of these deals you show or is it bolted to the end of the crank. If bolted check that it turns true then move to the other end for the same thing. IF all checks out then check pump shaft. Yup time consuming but will pay big dividends in the end. Once this is settled then check for obstructions in the oil flow to the pump like plugged filter or screen ,collapsed hose inside, any number of things like that. Maybe even the wt of the oil. To heavy will flow slow when cold and to light will leak by parts in the pump with little wear.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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