Mine carriage bolt broke and of course I lost the lock washer so I got a new one figuring how hard could it be to buy a 5/8-11 x 2 1/4 Gr5 carriage bolt. Turns out not easy. So I ordered one from ebay for $14. But what I'm wondering is how it's installed. The washer part is 63752 and bolt is 280667. New Holland (451) - NH MOUNTED PITMANLESS MOWER (7/69-12/13) Parts Diagrams under pushbar item 3. Does the carriage bolt go in from inside and the nut holds the washer in place? Seems like that because there's nowhere for the carriage bolt to fit in the washer which only has a round hole in it. I guess when I punch out what's left of the old bolt it will tell me? Does this thing have to come apart to put that carriage bolt in?
New Holland 451 mower pushbar carriage bolt
- Thread starter DogT
- Start date
- Views: 2896
WranglerX
Super Member
Punch out old one, its will tell how to install replacement...
Dale
Dale
petes
Silver Member
- Joined
- Dec 26, 2009
- Messages
- 108
- Location
- Bellingham, Washington
- Tractor
- Kubota B8200 (21hp) , IH B275 (28hp), JD 1830 (68hp)
Same thing happened to my 451 2 years ago... hey, why is mower cutting sod?!?! I looked for that darn "washer" for several hours. Finally borrowed the neighbors mower and tractor to finish the hayfield and ordered one . On mine the nut goes on the washer side. I recall having to remove the cross bolt (or pin?) through the "box" on the backside of the angle adjustment plate to get room to remove/reinstall the new bolt. I also seem to recall a standard carriage bolt head didn't clear the cross bolt - maybe a plow bolt or something with a flat head? I might be wrong on that, and may have just ground off the top of a carriage bolt to clear.. it was a while ago! When you get it apart see if the hole it goes in is square / parallel or square tapered. If tapered it's for a plow bolt instead of carriage.
Yeah, what a pain. Carriage bolts actually come with different sizes of square area, the JD guy asked me and of course I didn't know, they didn't have one anyhow. This one is a small size square head. Luckily I got one that was correct, a CNH part 280667, "5/8-11 x 2 1/4" short square neck round head bolt SAE GR5". I was afraid that when I pulled out that long bolt to get at the carriage bolt, the whole thing would fall apart, but it didn't. There actually wasn't room in that little caged area to get my 2 1/4" bolt into the hole. I ended up grinding off a corner of the nut side to get it to slide through the hole. Actually the bolt could be 1/4" shorter, but I may put a lock washer between that 'washer' and the nut. When I went to put that long bolt back in, it wouldn't catch the thread. I had to take it out and grind a bit of a taper on the threads to get it to go into the nut. It still took a lot of pressure from a lever on the head of that bolt to get it to catch, but after a couple hours I got it. I actually think the bolt that broke was not a GR5 by the looks of it. I feel like threading a small bolt into that washer so I can attach it to a wire so it doesn't get lost if the bolt breaks again. Doesn't seem like there's a lot of pressure on that bolt, don't know why it would break. Probably stress fracture from the guards going over rocks.
I finally even set up the distance when the 3-pt hitch is lowered all the way so the mower frame doesn't go down too far. But I notice now the round part of the frame doesn't seem straight on the tractor, I have to make the stabilizer arms that have the clamps and over-center clamps at different lengths which makes the whole frame off to the left and the drive shaft is now offset to the left. I notice now the inner shoe is now inside the right tractor wheel edge. I may have to re-visit and adjust everything again.
I'm getting to like this mower, I can do my 20 acres in about 8-10 hours and it's not a rectangular field with lots of trees and hills too. With the bush-hog it would take me twice that. I can often move along at 1st gear high range on the 2020.
I finally even set up the distance when the 3-pt hitch is lowered all the way so the mower frame doesn't go down too far. But I notice now the round part of the frame doesn't seem straight on the tractor, I have to make the stabilizer arms that have the clamps and over-center clamps at different lengths which makes the whole frame off to the left and the drive shaft is now offset to the left. I notice now the inner shoe is now inside the right tractor wheel edge. I may have to re-visit and adjust everything again.
I'm getting to like this mower, I can do my 20 acres in about 8-10 hours and it's not a rectangular field with lots of trees and hills too. With the bush-hog it would take me twice that. I can often move along at 1st gear high range on the 2020.
Yeah, what a pain. Carriage bolts actually come with different sizes of square area, the JD guy asked me and of course I didn't know, they didn't have one anyhow. This one is a small size square head. Luckily I got one that was correct, a CNH part 280667, "5/8-11 x 2 1/4" short square neck round head bolt SAE GR5". I was afraid that when I pulled out that long bolt to get at the carriage bolt, the whole thing would fall apart, but it didn't. There actually wasn't room in that little caged area to get my 2 1/4" bolt into the hole. I ended up grinding off a corner of the nut side to get it to slide through the hole. Actually the bolt could be 1/4" shorter, but I may put a lock washer between that 'washer' and the nut. When I went to put that long bolt back in, it wouldn't catch the thread. I had to take it out and grind a bit of a taper on the threads to get it to go into the nut. It still took a lot of pressure from a lever on the head of that bolt to get it to catch, but after a couple hours I got it. I actually think the bolt that broke was not a GR5 by the looks of it. I feel like threading a small bolt into that washer so I can attach it to a wire so it doesn't get lost if the bolt breaks again. Doesn't seem like there's a lot of pressure on that bolt, don't know why it would break. Probably stress fracture from the guards going over rocks.
I finally even set up the distance when the 3-pt hitch is lowered all the way so the mower frame doesn't go down too far. But I notice now the round part of the frame doesn't seem straight on the tractor, I have to make the stabilizer arms that have the clamps and over-center clamps at different lengths which makes the whole frame off to the left and the drive shaft is now offset to the left. I notice now the inner shoe is now inside the right tractor wheel edge. I may have to re-visit and adjust everything again.
I'm getting to like this mower, I can do my 20 acres in about 8-10 hours and it's not a rectangular field with lots of trees and hills too. With the bush-hog it would take me twice that. I can often move along at 1st gear high range on the 2020.
I finally even set up the distance when the 3-pt hitch is lowered all the way so the mower frame doesn't go down too far. But I notice now the round part of the frame doesn't seem straight on the tractor, I have to make the stabilizer arms that have the clamps and over-center clamps at different lengths which makes the whole frame off to the left and the drive shaft is now offset to the left. I notice now the inner shoe is now inside the right tractor wheel edge. I may have to re-visit and adjust everything again.
I'm getting to like this mower, I can do my 20 acres in about 8-10 hours and it's not a rectangular field with lots of trees and hills too. With the bush-hog it would take me twice that. I can often move along at 1st gear high range on the 2020.
