Most likely a 4 bolt flange I know because I have one laying right here on the desk. Common set up on many brands of tractors. Most are a simple spline shaft set up. Unbolt the pump and pull it back and the shaft should come out of the hub on the crank shaft. You may have to remove a couple bolts at the flex coupler right at the pump so you can lift the pump up and out of the way then pull the shaft out. BTDT many many many times over the years on many loader set ups
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