Flojet Water Pump hammering

PostRoadFarm wrote:
Happens when one or more faucets open and never stops until faucet is turned off- regardless of demand. Battery is full and does it even with generator. A tech got it to stop one time by opening/closing the valve from the tank to the pump about 5 times in a row...he said it was priming (though this unit says it does not need priming). He didn't check the shower though and as soon as it was turned on, the hammering started again. We tried holding the pex and made sure none (at least around the pump area) was touching anything but it didn't seem to be the cause. We had a similar set up in our Airstream (different pump manu.) and it never made a sound...

My first attempt to fix is the flexible/soft hoses and following pex to add dampeners where it touches anything...

I also read there is a pressure valve screw that can be adjusted but it isn't showing on the cut-sheet for our model

Thanks for all of your replies...