POWER STEERING 1800 A

OK I feel that the PS is not up to spec. i checked the psi with the steering wheel turned all the way to the right or left Gauge only reads 800 psi the spec in the book is 1000 psi...i added a shim washer under the check valve spring=thickness of a 1/4 lock washer..no change of pressure...i checked hyd lift pump psi by moving the hyd control lever on the right side... dead heading lift pump and reading the gauge for that port...1200 psi ...new system psi 1750 minis 250 psi should be 1500
so we are low 300 psi...main releaf check valve adjustment is under hydro unit cover :(
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Not a clue, but you really need a high pressure valve/restrictor to protect those high pressure oil filled guages? Might be fitted, but doesn't look like it.
 

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