I'll be back at camp on Wednesday and get a picture.I’m a little confused about what you mean by going under the fender. Is it possible that your fender is slightly bent, causing the conflict? Is it possible for you to include a photo of where contact is being made?
I’s hard to tell for sure, but I think the two brackets are reversed. Right bracket is installed on the left, left bracket is installed on the right.Here is more info.
It looks like the right bracket holding the hitch onto the right final drive in your picture is backwards. It's sort of hard to see it in the picture, maybe it's just the picture making it look that way. I don't know how the bail would fit if the brackets are backwards.
Looking in the Cub and LoBoy parts manual, the left bracket is part number 520125R1, or R2.
It may or may not have a hole in it to get to the plug to check the final drive oil level. Early brackets had no hole.
The right bracket is 520124R1 or R2.
Usually the number is cast into the brackets, you can look at the numbers to see if the brackets are on the right sides of the hitch.
Below is a picture from TM Tractor Parts of a Fast Hitch right side bracket on a Cub. This hitch has a depth adjustment lever, to the right of the seat. Newer hitches have the crank, to the right of the seat.
The brackets at the ends of the round bar the pull bar hangs down on are upside down. They thread onto the round bar. They need to be changed 1/2 turn. Turn them so the are as far onto the threads as they can go, and be the right direction.
I have found that putting some grease on the seat shaft, as you put it together helps it move better.
Below are pages from the 1955 Cub operator's manual showing the Fast Hitch.
https://farmallcub.club/rudi/farmallcub.com/rudi_cub/www.cleancomputes.com/Cub/Cub Owner's Manuals/McCormick Farmall Cub Operator's Manual 12-20-55/Page 18.jpg
I think the part numbers of the brackets I have seen are on the side that would be visible when the brackets are installed, so you may have to take the Fast Hitch off the Cub to see the numbers.Looking in the Cub and LoBoy parts manual, the left bracket is part number 520125R1, or R2.
It may or may not have a hole in it to get to the plug to check the final drive oil level. Early brackets had no hole.
The right bracket is 520124R1 or R2.
Usually the number is cast into the brackets, you can look at the numbers to see if the brackets are on the right sides of the hitch.
Sorry. Cub is a '53. I am going to my cabin Wednesday so I will be looking at it to verify all of the comments.You didn't say what year the Cub is.
To add to what tst said above, the 2 rear sweeps for the Cub 144 Cultivator attach in the large holes in the lower part of the Fast Hitch brackets.
Good you are making progress with the Fast Hitch.I also will need to get a leveling crank (or lever). How do I tell which one I need?
I'm not sure what you mean. The spacer near the rear of the lift rod is supposed to be there, but yours is shiny and probably one someone made. The original spacer is not shiny, and a larger OD.Also what is the dimple on the bushing that goes on the lift link for?