The original zerk fitting had long since fallen out before I bought the tractor, so I tried to install a 4-28 as was used on the front axles. Didn't work ! Someone had already been into and tried to fix this. I ordered heli-coils and the wrong size arrived. I solved this with harbor freight set of zerk fittings. Had to tap the hole and clean all the shavings afterwards but the new zerk went into place.
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