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Message: <blockquote data-quote="jeffco" data-source="post: 28878" data-attributes="member: 2081"><p>Check your hydraulic control valve for the boom and bucket, if there is a third spool you may have auxillary hydraulic plumbing and that system is open center so fluid can flow to the tank in the neutral position but has no escape route if engaged, that would be in the control of the attachment. If accidentally engaged it will reduce engine power by a lot if it even will run at all. The guy who sold me my 825 said the center pedal was the park brake, I quickly learned that just was not true. It would nearly stall my larger perkins diesel. It sounds like you will find either the auxillary or a relief valve stuck in the closed position . In any event, proceed with caution because old hydraulic hoses can burst under high pressure and that can be very hazardous to your health and/or eye sight. Hope some of this makes sense, jeffco</p></blockquote><p></p>