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Message: <blockquote data-quote="walio123" data-source="post: 106439" data-attributes="member: 9827"><p>I looked at the diagram and yes, the relief valve is not adjustable. If it is the reason the Aux hydraulics should also be weak. Is that correct? is bucket curl also weak under load ? And how it became the weakening of the hydraulics- smoothly, gradually or abruptly? Once the movements are fast without a load, the chances are that the damage is relif valve is great. If only the boom is weak, I can see that there is also a boom port relief valve. It is the probable cause in th case that only boom is weak under load. Boom relief valve is Item 29 on picture. https://partstore.construction.newholland.com/us/parts-search.html#epc::mr63392ar380160</p></blockquote><p></p>