Pressure regulator valve bore and valve wear is pretty extreme on most of these that I  have checked.

Below is comparison of original valve and new over sized anodized valve.

 

Valve wear that causes high pressure could contribute to most of the common problems that we see  in this unit.

1.  pump bushing spin out.  If the pump is working hard to make the high pressure then it loads up the pump bushing.

2.  Drum breakage.  High pressure exerted on the drums can break them.

3.  Piston breakage.  High pressure on the pistons can break them.

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