Sagging doors: Repair or replace hinges?

The front Passenger door has the dreaded sag. I understand this is due to the hinge pins wearing down. Can these be replaced, or does the whole hinge need replacing?

Klang
 
Plank of wood and a twisty jack.

Place the wood under the sill of the door when the door is open.

Jack under the wood

Presto!
 
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