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Message: <blockquote data-quote="Mike10" data-source="post: 44634" data-attributes="member: 5461">I would first look at the fuel system.  Generally when hyros fail it is not a lack of engine power but pulling power from the hydros because of internal leakage.  It's possible a bearing could be going but not in both sides at the same time.  What you are describing sounds like is a fuel supply problem.  Change your fuel filters and air filters.  When bleeding the fuel filters be sure a good stream of fuel is coming out the bleed screw when the key switch is on, if not the fuel pump may not be working or partially plugged.  When you have the inline filter off remove the fuel cap and blow air back into the tank to push any obstruction out.  Your fuel cap may not be venting which would allow the engine to work for some time before exhibiting the lack of power. A hydro that is failing will not work for 20 minutes before acting up.  If it is something mechanical I would look at the axles, drive chain and drive chain tightener in the chain case, but again it would not work for 20 minutes.</blockquote>