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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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