On a 3400 if it has the Ford 730 series loader on it (component #s 19-417 / 19-419 / 19-523 - could be any one of the three) the part numbers are: 291315 (4) bolt hub that bolts to crank > C5NNN879A (4) bolt hub that slides onto the shaft > 292222 shaft 10.38" long. You will find the compnent # of your loader on the steel id plate left front inside of loader frame. These parts should be available through New Holland, but are also available aftermarket. Truth be known, the aftermarket parts might possibly be from the same manufacturer as oem. Hope this helps.
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