In Reply to: Ford 501 sickle mower /breaking pittmn arms posted by Bill Redmer on July 06, 2015 at 14:38:57:
Do you have the two arms with clamps that clamp to the lift arms? One is attached with what looks like a tie rod end and the other is slightly different. They prohibit the mower frame from rotating on the lift arm balls. The top link is also special to the 501 mower. Check the manual in the red bar on the top of the page /mower section. If all the parts and pieces are correct the mower should give you years of good service without breaking.
Hope this helps, AL CT