3 Point on my 640 starting acting goofy when lifting today. Got all everything ready to pull the top cover off when I noticed 2 of the 3 bolts that hold the spring seat support were broken and the third was backed off and bent.
No problem getting them out.
Didn't have any grade 5 bolts here to replace them today, but I did have a grade 3 to play with. Noticed something, the original 3/8"NC bolt has an 11/16" head, new bolts will have a 5/8" head, shouldn't be any problem there.
Problem is can't get the 5/8" past the end of the spring.
Thoughts are, use Allen heads, going a small dip in the end of the spring to allow the head to pass, or remove the yoke and spring.
Manual doesn't cover this area, so I guess it unscrews. I think I remember someone trying to remove one a while back, but I can't find the post.
Any secrets to remove it without removing the cover to remove it?