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Message: <blockquote data-quote="Mike10" data-source="post: 43903" data-attributes="member: 5461"><p>A relief valve problem should also slow down your bucket circuit.  Also a weak relief valve will not labor the engine during a normal raise or lower cycle.  You can attach a pressure gauge at the bucket cylinder to check if the relief valve is working.  Since you mentioned that the engine works during raising or lowering I am assuming you are getting an adequate oil supply to the pump.  That leaves two possibilies, control valve or the boom lock solenoid.  There is an orifice plate in the top of the control valve under the fitting that the boom lines attach to.  I don't remember if it is the front or rear fitting.  It is possible that some debris is lodged in the small hole blocking oil flow.  As for the solenoid valve it is possible that something has gotten into it and blocking the flow.  There is just no easy way to check it.  Since you had the cylinders rebuilt it is possible part of the old seals could have gotten into the hyd circuit.  With the standpipe screen mentioned by the other poster there should not be anything getting to the control valve from the hyd pump.</p></blockquote><p></p>