How to change pump output pressure?

[howiez]

A newbie question. My SS wash have both commercial bays and regular bays. Cat pump supposed to give output pressure of 1600psi for commercial bays, and 1100psi for regular bays. Most of them are like that except one of regular and one of commercial bay pumps both give out at 1300psi.
My readings says cat pump don't control pressure, someone suggested it is the spraying tips that makes the pressure differences. But after switching tips, it made no changes in pressure.
Anybody knows how do I drop or increase the pump output pressure?
Thanks

 

[soapy]

Your unloader valve can be adjusted to raise the pressure provided that you have enough motor and the pump is in good order.

 

[I.B. Washincars]

The pump just pumps water, at whatever amount that it pumps at the RPM it is running. The pressure will be dictated by the spray tip size and how much water is bypassed with the regulator/unloader. To change the amount of water the pump is pumping you will need to change the speed. This can be accomplished by a larger motor pulley or smaller pump pulley.

 

[MEP001]

A newbie question. My SS wash have both commercial bays and regular bays. Cat pump supposed to give output pressure of 1600psi for commercial bays, and 1100psi for regular bays. Most of them are like that except one of regular and one of commercial bay pumps both give out at 1300psi.
My readings says cat pump don't control pressure, someone suggested it is the spraying tips that makes the pressure differences. But after switching tips, it made no changes in pressure.
Anybody knows how do I drop or increase the pump output pressure?
Thanks

Your system has two regulators and a solenoid between them that lets spot-free run at a reduced pressure. That solenoid might not be closing completely. You could also have a problem with the pump. The quickest way to find the problem is to run the pump on high pressure with the trigger pulled and pinch off the bypass hose from the regulator and see if there is flow going through it. If there is, the main regulator is bad. If there's not, pinch the bypass hose for the spot-free regulator, and if there's flow there the solenoid is bad. If there's not, either the pump is bad or you may have a check valve somewhere that's bad.