I'm gonna say, probably don't need replacing. My parent have a groundskeeper which is just a longer golf cart with a dump bed and you can hear it squeaking half a mile away. There's a lot of metal to metal contact on a golf cart and I have never looked closely but haven't seen any grease zerks that stand out.

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14