Not being able to lift heavy loads, or as heavy as the tractor use to be able to lift, definitely points towards a loss of available pressure but still does not rule out other potential malfuctioning components.........short of flow testing the hyd. pump there is no way to confirm its efficiency and replacing it will be "on a hunch"............
According to the book what type of hyd. pump does your tractor have?? gear, vane, piston??
If it's equipped with a gear pump the hyd. system will also be equipped with one or more relief valves that may be opening prematurely causing a loss of available pressure......Note: the tractor may be equipped with relief valves regardless of what type of pump it uses, especially if auxillary control valves have been installed......
If it's equipped with with a piston or vane type pump, there may be a malfunctioning stroke control valve that is "shutting the pump off" prematurely or the stroke control may simply need to be re-adjusted due to a weakened spring...........
Also you mentioned you'd be changing the oil.......change the hyd. filters while you're at it(inspecting the old ones for filings- iron, brass, aluminum, etc.) Determine their placement in the hyd. system, if you're lucky and they are "downstream" from the pump you'll be able to tell immediately if the pump is failing by the amount of contamination found in the filter.........
Not to say that the pump couldn't be the problem but there are many other components in a hyd. system that can cause the symptoms you speak of, components that should be far cheaper than the pump too.............
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