Usual I use the torch on nuts, but those expand which is good for that. Rinse and repeat if any rust remains. Some hitch balls have internal thread and the bolt goes up through the bracket in to the hitch. I was able to get two of the bolts in all the way and good to go. Home Office First, remove any loose or flaking rust with a wire brush. This will also protect the hitch ball when it is not in use. Dry the metal and paint with an oil-based paint within 24 hours to prevent the return of the rust. WD-40 wouldn't be able to do it. I want to remove the ball, roll the ball mount upside down, which will lower the mounting point, and put the ball back. The mount wiggles around in the receiver (side to side) and can slide forward/backwards slightly (~1/8") with some force applied - such as tapping it with a block of wood. If the metal hasn’t rusted too deeply, a little elbow grease will go a long way. Grease is one of the most effective tools for preventing rust, corrosion and heat build-up on a trailer hitch ball. How do I remove rust from threaded hitch holes in a box frame? . Prevent this with proper maintenance, regular use, and wax and/or painting. If you have an iron trailer hitch or hitch ball that’s beginning to rust you can remove the rust with Naval Jelly. Don't forget to use a little oil on that tap. Whoever put the ball on (years ago) have it step up and then the ball on the top of the step. Worried having the pin expand will just fuse itself together more? Its off by the time you get where your going. A lot of hitches and trailer equipment comes with special coatings that prevent rusting, but this can rub off over time. If your hitch ball is rusty, you can use WD-40 to loosen the rust and then you will need to scrub the hitch ball with a wire brush. I can't even get the bolts to seat properly. The ball mount insert is stuck in the receiver. Try Liquid Wrench. Wipe the hitch clean including the trailer brackets. Rinse and repeat if any rust still remains. Next, scrub the object with the abrasive item once more if needed to remove any remaining rust, and then rub it down with a pad soaked with denatured alcohol to remove any excess moisture. Applying a generous amount of Liquid wrench, and I've hit it with a hammer a few times with no luck. Unfortunately, the holes in the frame are very rusted from the 8 years of driving without a hitch. Household vinegar or other methods may also be used to clean any surface rust that remains. This will remove rust that you can't get with sandpaper or a wire brush. The hitch has been sitting outside for many years. Its this type: I can remove the pin easily. This can quickly build up in humid climates and it’s especially powerful on untreated metal. Just noticed some surface rust on the Toyota trailer hitch. I'm debating using a brass bristle brush on a drill to try to clean it out but that could ruin the threads. What about getting a thread tap the right size and running that it. Remove the rust with homemade or store-bought cleaners. If you have an iron trailer hitch or hitch ball that's beginning to rust you can remove the rust with Naval Jelly. It turns out that rust has a greater volume than steel so the ball mount was now a tight press fit in the receiver. Dry the metal and paint with an oil-based paint within 24 hours to prevent the return of the rust. Don’t put a hook at the bottom or neck of the ball. 2. You may have to have the bolt holes welded shut then drilled and re-threaded. Rinse and repeat if any rust still remains. Soaked the holes with WD-40 but still no luck. Checked and made sure that they are inserted following retapping, do as MachoMahma remove rust from hitch ball and go one larger! 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