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granger: Could be a number of items; lines, pump or bypassing within cylinders. Leave it parked for a spell with loader up. If loader starts to settle bypassing will be the culpert. Bear in mind it would have to settle quite fast to create a lifting problem. If it settles very slightly or not at all, look to the pump for your problem. There is one other thing, quick couplers can as they get older, block or restrict the flow of oil, if that is the case install new ones. If a line blockage is the case and the pump is good, it should cause tractor to labor a bit while lifting. I have seen the inside layer of a hose peel off and restrict oil flow as well. Presure relief valves have been known to be faulty but not often. Just start the process of elimination. See if loader settles while parked, next listen for engine labor while lifting, but remember a poor pump will probably not cause engine labor even if there is a line restriction. If this happened all of a sudden, the first place I'd look would be line restriction. Pump and cylinder failure tend to be more gradual, often so gradual you don't notice it until you use another machine.
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