Chances are, if you do check the pressure, it will be very close to what it should be. Even if you "correct" it, to 1650 psi, the pump will still move the blade slow compared to most other brands, and the newer Meyer E-60 pump. That's why Meyer came out with the new E-60. Because the E-47 is just plain slow. The gauge you would need to check the pressure is not cheap either. If you have drained the fluid, cleaned the strainers, flushed the reservoir, put new fluid in, and it's still "slow", chances are it won't get any faster no matter what you do to it. The E-60 is probably about twice as fast as the E-47. Not what you wanted to hear, I know.....
~Chuck