ddb123
Platinum Member
The shear pin broke on my plow. I've tried two more bolts but they instantly shear when the plow starts to dig. What do I put in there that won't break?
How do I fix my plow?
- Thread starter ddb123
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ddb123
Platinum Member
First pic shows how it is broken. Second pic shows where the pin goes.
So I just need a hardened steel bolt?
tcreeley
Elite Member
Is that 5 marks on the bolt that is still there? My guess is you need a bold at least as tough as the one there- grade 5 I think. Just count the marks on the head of the bolt and buy one just like it that fits snugly without any play. Make sure that where the bolt passes through from one plate to the next- that there aren't any threads cut to weaken it. I like lock wasers and flat washers combined, but use the same setup as you have on the other bolt still in there.
Good luck.
Good luck.
bullbreaker
Elite Member
Here's a diagram a single plow . Worksaver Standard Size One Bottom 14" Plow
I think its saying it takes a # 2. Don't take this wrong way but that plow looks almost home-made and from horse drawn moldboard. Do you know brand welds look good.
If it was mine I'd just keep putting in larger size shear bolts as long as I didn't damage 3 point arms. I'am guessing your useing for small food plots or gardens.
Boone
I think its saying it takes a # 2. Don't take this wrong way but that plow looks almost home-made and from horse drawn moldboard. Do you know brand welds look good.
If it was mine I'd just keep putting in larger size shear bolts as long as I didn't damage 3 point arms. I'am guessing your useing for small food plots or gardens.
Boone
OP
ddb123
Platinum Member
I don't know how many marks are on the bolt, I can't find it now. I don't know if the plow is homemade or not, I bought it at an auction. I am using it for a garden is all. I wanted a single plow because my soil is hard and very rocky. I will pick up some bolts from walmart tonight if they have them and I'll update tomorrow.
Reyer Farms
Platinum Member
I put grade 5 in mine 3 marks on head. Five marks on head is grade 8. Weird huh? Grade 8 will probably get you in trouble. Better for it to shear than break else where, bolts are cheaper than shop time. Thanks hope I helped.
OP
ddb123
Platinum Member
I actually found a grade 5 out in my garage and popped it in. Made it 15 feet and SNAP!
Reyer Farms
Platinum Member
Dang. Well, I would double check your adjustments to be sure the plow is not in a bind. If it is set properly you may need a better bolt. What tractor are you using? I would hate for it to break something. From the pic ( I cannot enlarge) it looks like your plow is centered between wheels. Is it?
Reyer Farms
Platinum Member
Is the plow binding or hitting something? Dang I know it's frustrating.
OP
ddb123
Platinum Member
I have it set so the right tires ride in the last furrow. The plow is definitely binding. This is the first time to plow this soil and it has rocks from baseball size all the way up past basketball size. I am going slow so as not to break anything. It is a Kubota L3540. In 2wd it will stop and spin. In 4wd it will go ahead and dig up the rock (or break the bolt). I only used 4wd until I broke the first bolt. After that was 2wd but the bolts snapped as soon as the plow started to dig.
Is the hole where the bolt goes through sightly worn or the edges worn round. If so, it could be putting too much stress on one spot of the bolt. I don't know what else it could be with out seeing it in person. Is the plow set up correctly? Plowing at the proper depth?
OP
ddb123
Platinum Member
MIKE R said:
I believe the plow is set up correctly. I watched the EverythingAttachments video
. It seems to be plowing plenty deep. I think the hole itself is in pretty good shape. Maybe it is just a combination of big rocks and weak bolts. I know plowing slowly isn't "right," but I will plow slow this year and try to get all the rocks out. Hopefully a grade 8 will work. Otherwise I'll just have to duct tape it together.
Shield Arc
Super Member
Reyer Farms
Platinum Member
Is the plow back end ( cutting edge not mold board) in line with the inside of right tire ? You might can take out less dirt for now to clear your field. I am so glad we don't have rocks like that!
sixdogs
Super Star Member
- Joined
- Dec 8, 2007
- Messages
- 15,846
- Location
- Ohio
- Tractor
- Kubota M7040, Kubota MX5100, Deere 790 TLB, Farmall Super C
I think I'd go back a step and try to find out what kind it is and try to find a maker or owner's manual or something for some information. It does not seem right to use more than a grade 2 shear bolt and certainly not a grade 8. Maybe it does, I don't know but I have a single shank ripper that can go 20" deep @75 HP and has a 3/4" grade 2 shear bolt. When the prior owner of it substituted a grade 8 bolt, because he was trying to rip out stumps with a 150 HP tractor, it bent the thing like a pretzel.
Something is not right. Maybe there are too many obstructions in the dirt, maybe the tool is set up wrong but I can't imagine shearing the bolt in 2WD as soon as it goes in the ground. Beats me. It may well be right to use a bigger bolt but if there was more info out there it would be helpful.
Something is not right. Maybe there are too many obstructions in the dirt, maybe the tool is set up wrong but I can't imagine shearing the bolt in 2WD as soon as it goes in the ground. Beats me. It may well be right to use a bigger bolt but if there was more info out there it would be helpful.
oldnslo
Super Member
In looking at the side view picture it appears that the brake that goes from the top link down to the main frame is bent. Could this be causing the point of the plow to dig in to much and over stress the shear pin. Is the land slide parrallel to the ground while in the furrow?
OP
ddb123
Platinum Member
Hmmm. I see what you mean but I have the top link set up so that it is parallel at its deepest point.
I like the quote in your sig, by the way.
I like the quote in your sig, by the way.
texasjohn
Super Member
I think you have a few choices.
buy lots of bolts and replace as needed
buy a grade 8 bolt... don't know if Walmart has these. Risks twisting plow or busting something on tractor.
plow more shallowly and when a rock is found maybe it'll bounce over it and after soil is loosened around it it'll come out on some future pass
plow in 2 wheel drive and dig out rock when you loose traction or raise it up and go over it
I think that the plow is doing its job...when you hit an apparently immovable object, it breaks.
trying to pull a big rock out of the ground with a plow is not what it was designed to do.
Based on prior posts and information, I think this is where you are...not what you wanted to hear, but likely the reality.
buy lots of bolts and replace as needed
buy a grade 8 bolt... don't know if Walmart has these. Risks twisting plow or busting something on tractor.
plow more shallowly and when a rock is found maybe it'll bounce over it and after soil is loosened around it it'll come out on some future pass
plow in 2 wheel drive and dig out rock when you loose traction or raise it up and go over it
I think that the plow is doing its job...when you hit an apparently immovable object, it breaks.
trying to pull a big rock out of the ground with a plow is not what it was designed to do.
Based on prior posts and information, I think this is where you are...not what you wanted to hear, but likely the reality.
