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Brazilton KS | I think our 155-65 just has simple gear pump driven from the transmission with a relief valve to control top pressure. I know that when you have low hydraulic pressure complaint and you go and turn the relief valve in a ways it will make a 3000 psi gauge look like a windmill when it is plugged into an outlet that is working.....our problem was corrosion in the detent housing of the spool we were using, didn't effect the one we put the guage in.
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