No Lift on 3 Point if Any Weight Present.

That could be several things. Let’s eliminate some of the simple ones first.

How is the fluid level?

Do you have a front end loader and if so how does it act?

If you raise the 3pt. and hang some weight on it. will it stay up for some time, like overnight?

Have you checked the suction pickup screen in the reservoir?

When you raise the 3pt without weight, does it raise up really slow or normal speed?

Assuming you have power steering, what happens when you turn the steering wheel while trying to raise the 3pt.? It should slow or stop the 3pt. and give priority to the steering system. Any stuttering, jerking or odd sounds could indicate a flow/pressure problem which might point at the pump. Too many unanswered questions to make that call yet.