Adjusting Pressure on HydroMax Water Pump

Updated 06/10/2025 | Published 05/09/2022

Question:

The answer to one of your QandAs says that the pressure can be adjusted on the HydroMax water pump. How do you adjust it?

asked by: Jim

Expert Reply:

While the HydroMax RV Fresh Water Pump, # P25201 can be adjusted, the Tech Rep at Valterra recommends against doing so stating that the units are set at the factory for best results.

You will want to adjust the By-Pass spring by turning the screw. Screwing the by-pass screw in will raise the pressure and unscrewing the by-pass screw counterclockwise will lower the pressure.

expert reply by: Michael R

Alain B.

6/10/2025

I bought a wather pompe and I want to adjust it model hydro max P25201 I have 2 Allen keys screws adjustable tank’s for your answer regards Alain Brisson

Jameson C.

6/10/2025

@AlainB Valterra won't give out instructions for adjusting the pressure of the Hydromax and recommend sticking with the preset 55 psi setting it has. Going up in pressure is going to cause problems with your plumbing most likely. Does yours seem too low?

Alain

6/10/2025

@JamesonC the micro switch never stop the pump when I finish to used the faucet, can I do something?