My hydraulic pump pressure seems to surge when the tractor is running at any speed. Replaced the hose from the pump to the controls as it started to bulge and then blew from the surges. Put a new hose connection on yesterday and the metal pipe at the bottom of the assembly rocks some from the surges now, worried the metal tube will eventually fatigue. Is my pressure relief valve sticking and causing a pressure build up? I can't find anything on rebuild kits for the valve. Is there a rebuild kit available or is there some particular parts that I should look at replacing in the valve? Tried doing a search in the farmall discussion forum but couldn't come up with any info.