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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.
There are no schematics available because the manufacturer doesn't sell parts for the gun. The spring usually goes right into the end of the hose, then the little bullet like valve follows. Did you know you can buy a new gun for about $22.00 Canadian?