Does the shaft have play in the direction of belt pull? If the belt was too tight, the bushing wears.
Mark alignment, and pull one of the arms off the side of the pump, then the washer. behind that will be an oring. gently pick it out.
If that oring is anything but plump round and supple, you need to reseal the pump, otherwise put it back(lube with a dab of vaseline/assembly lube) and hope for the best.
I feel left out, my pulleys only seem to dent or bend, never had one crack.
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