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Message: <blockquote data-quote="Scott26" data-source="post: 88999" data-attributes="member: 12804"><p>I am helping my father with his 753 that has a HP1 code. For some time the hydraulics would not engage when starting the unit but if he loosened the filter and retightened it would work fine. Now he has a HP1 code so I am looking for advise on troubleshooting. I am assuming a plugged filter would flag a HF code? There is no hydraulic power so we are wondering could it be the charge pressure sensor? thanks in advance for any help</p></blockquote><p></p>