Are you saying the keyseat is too long? or too deep? If you measure across the keyseat to the bottom of the seat, for a 3/16" key (.1875"), it should measure 3/32 (.0938) or a little deeper. The average guy doen't have the proper tools to measure things like this but if you have a dial caliper you can check it.
I would be more concerned that the key seat is worn, and if that's the case you'd be better off making a new shaft or welding up the end and having a new key seat cut. Preferably a woodruff key that won't work out. If that's the case then I'd also get a new coupler sprocket, lovejoy coupler, or whatever couples the pump the the shaft.
If there is just a space above the key when the shaft and coupler are together, a set screw above it will hold it down and that's how most are done. Then the key can't wiggle and wallow out the slot, and it stays in place.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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