Jack, I was on a service call the other day with the same complaint. I have a pressure gauge rigged up to test the water pressure at homes. I removed the washer hose at the shut off valve and put the gauge on. Ideally the pressure should be at around 55psi, 75 max. In this case it was about 100psi. The hammering started with the gauge still attached, no lines to the washer. The customers regulator was bad. Im not saying this is your case, but it's possible. Catriver...post back.
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