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Every 5.5 HP pressure washer runs between 2,200 and 2,500 PSI with most set by the manufacturer at 2,400 PSI with 3,600 RPM of engine speed.
Due to the power required to produce more than 2,500 PSI a 5.5 HP engine would lose engine speed as it can not produce enough power for the higher PSI output. It is a matter of hydraulics vs input power.
Any gas pressure washer will produce lower pressure with lower engine RPM. Looking at S2350 as your model number yours may be set to 2,350 PSI by Simoniz.
Can anyone Solve this? My simoniz S2500 gas powered pressure washer has low pressure coming right from the outlet. It used to be high pressure until now.. I think it has something to do with the pump and if so, is there anything I can do to repair this problem? The screen is good; water comes out of the hose good, wand is ok......Just that lower pressure is at the wand even at high settings....It comes in a form of a spray in both modes......