I have a TD-8 that the hydraulic system whines and is slow. Stated doing this after I rebuilt lift cylinders that were

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By chance do you have the full model with any letters or numbers after the TD eight and your serial number?

The symptoms you describe are a sign of cavitation from the system be an air bound however if it remains consistent and does not come out of it after you run the functions and work the air out of the system then it means either you are still sucking air possibly from the suction side of the pump or the pump cavitation did and because of its age or condition is on its way to failure. Usually when the pump start getting louder and the functions operate slow it means the pump is tired. Check inside the hydraulic filter for fine metal or debris that would confirm a pump failure occurring. If the pump is producing metal it is advised to not run the machine to further any contamination through your circuit and components. The components and system will need to be thoroughly cleaned out and flushed if found before running a new pump or replacement component. If there is no metal found I recommend having the pressures tested and confirmed whether they are in factory specs as even if the pump is not producing metal if it is weak then it would be still time for replacement. Please take a moment to rate my answers as that is how the site credits my time helping on the site. Five star ratings and bonuses are always greatly appreciated.