Depending on your skills and available tools you may be able to make this a DIY project. These small tractor buckets do not have bushings. The pins fit into drilled holes in both pieces and pins the same size inserted. Clearance between pins and hole is fairly loose. That is why the OP manuals call for lubricating every 10 hours of use. Dirt, water, and lack of lube rapidly cause wear. Your look to be well worn. Having a tractor dealer fix them at $125/hr may get pretty expensive, may approach or exceed replacement cost.
First step is to pull, punch out all the pins, may require a lot of soaking and heat. Use a punch pretty close to the diameter of the pins or you could mushroom the pin and make removal harder. Clean up and inspect. Then post pictures (close up and determine the extent of wear. Then we can give better solutions/answers. It looks like 3/4" - 7/8" pins. A Magnet base drill can be rented to bore out the holes and then fashion new pins from cold rolled shaft stock or one of the various hitch pins available which are forged steel. For me this is a fun project but solution comes after seeing condition not speculation. I live right down the road. And another member that has a big shop lives close also. He is a welder though so that may not be the right solution. He has good practical ides though.
I took another look at the pictures; it looks like the pins are all smaller than the holes. Depending on how long it has operated that way it may not be all that bad. People do strange things when they are not very mechanically minded, out of ignorance of the issues.
Ron
