Shurflo Revolution 4008 severe hammering

Thank you both for the advice. I truly appreciate the time you each took to help, and you both helped, thanks. I’ll consider a accumulator but I am not trying to make the pump silent. I was wondering why it was shaking like an out of balance washing machine, running real low and sputtering instead of cycling on and off like it is supposed to. Old-Biscuit, the pump pressure adjuster needed tightened 1/2 turn. As soon as I cracked the screw 1/8 turn, the pump shut off, waited, then turned on, then off waited, then on. That’s what it’s supposed to do. This was with faucet cracked open around 20%. It still shook though so I tightened it further. End result was 1/2 tighter on the pressure screw and it cycles on and off as it needs to with a faucet cracked open, shuts off when faucet is closed, runs smooth the whole time without shaking and works good with faucet fully open. It seems fixed and ready to go. I wouldn’t have changed a factory setting without your advice. Thanks to you both. Really appreciate your time.