After a few months of very intermittent use it developed a rattling noise on low flow or before shutting down. Here is the noise, phone mike makes it more "rattling" than it is:
https://youtu.be/S2PteAI_M3o.
See how loud it is on low-flow, then at sec 8 rattle subsides when I open the faucet more, then at sec 18 I shut the faucet off and rattle increases again for the last few seconds before the pump stops.
It's not the motor - all is quiet when I run pump without the head.
It's not debris in the head - all is clear inside.
Rattle disappears for one day or so when I disconnect and reconnect the pump output, then re-appears again.
Some bearings?
Also, pump lets a steady trickle of water through when it's Off, as long as there is any slight intake water pressure. Is this normal?
The pump has pressure switch supposedly set to 55 psi, and by-pass supposedly set to open at 40 psi.
I have 21 oz accumulator charged to 30 psi, tried to charge it to 45 but doesn't look like accumulator is causing or affecting the rattle.
