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After pressing off the pulley, remove both bolts on the back side of the reservoir and remove the large, high-pressure fitting from the rear of the pump. Then, mount the pump in a vise using the flat portion of the shaft housing. The housing is press-fitted over the pump, and a few whacks with a large rubber mallet will drive the reservoir off the pump body. This will expose the one large and three smaller O-ring seals (arrows) that need replacing.