Shaefs
New member
This exact thing just happened to me. Is this common? Am I doing something wrong for this bolt to break?
Need help getting shear bolt out of driveshaft
- Thread starter denverdave66
- Start date
- Views: 9910
tow653
Gold Member
The shear bolt is supposed to break in you put too much strain on drive train. It protects the more expensive parts,better to replace a $.89 bolt than a $400 gear box.
boggen
Elite Member
- Joined
- Feb 22, 2011
- Messages
- 3,789
- Location
- Trivoli, IL
- Tractor
- SSTT (Sideways Snake Tain Tractor) and STB (sideways train box) tractor, dirt harvester
when the blades of the bush hog, hit something solid and hard. the blades can instantly stop. and all the power / shock can be transmitted back to the gear box and tractor. the shear pin, is there to let the PTO shaft "spin" and bust cut/shear the bolt. so the power / shock can NOT be transmitted back to the tractor. and to protect the gear box on the bush hog.
as others have said, get to strong of a "shear pin" and you damage the gear box on the bush hog, or really get into some expensive repairs on your tractor.
if you go with a weaker "shear pin" the pin will shear way to quickly every time you hit something, and you will have to replace them non stop.
if you are replacing the shear pins non stop. maybe you are trying to run over stuff that you shouldn't be running over. and the rotatory cutter just not meant to handle. or you are running the blades into the dirt, or into logs, or rocks or something.
the manual for the rotatory cutter / bush hog or other 3pt hitch implement you are using will state what size "grade" of bolt to use as a shear pin.
================
you can get "slip clutches" that can replace "shear pins" on some 3 pt implements. when slip clutches are properly adjusted, they can be a easy way to keep on going, without having to replace shear pins.
slip clutches when bought new, need to be "burned" errr allowed to slip. to remove the "new-ness off of them" so the operate properly.
as others have said, get to strong of a "shear pin" and you damage the gear box on the bush hog, or really get into some expensive repairs on your tractor.
if you go with a weaker "shear pin" the pin will shear way to quickly every time you hit something, and you will have to replace them non stop.
if you are replacing the shear pins non stop. maybe you are trying to run over stuff that you shouldn't be running over. and the rotatory cutter just not meant to handle. or you are running the blades into the dirt, or into logs, or rocks or something.
the manual for the rotatory cutter / bush hog or other 3pt hitch implement you are using will state what size "grade" of bolt to use as a shear pin.
================
you can get "slip clutches" that can replace "shear pins" on some 3 pt implements. when slip clutches are properly adjusted, they can be a easy way to keep on going, without having to replace shear pins.
slip clutches when bought new, need to be "burned" errr allowed to slip. to remove the "new-ness off of them" so the operate properly.
As boggen said, if you have a slip clutch, which is preferred for a bush hog type cutter it will slip instead of breaking the bolt.
PTO shafts with slip clutches are more expensive than bolt only, but very worth it if you are going to do any heavy cutting.
A caution, if you add a slip clutch, your present PTO shaft may have to be shortened.
PTO shafts with slip clutches are more expensive than bolt only, but very worth it if you are going to do any heavy cutting.
A caution, if you add a slip clutch, your present PTO shaft may have to be shortened.
AHNC
Gold Member
Well, Dave, you came to the right place if you are a rookie. I, compared to many here, am still a rookie a few years into it. When I first found this forum and was considering buying a tractor I lurked for quite a while and when it came time to register and post to ask questions I had to come up with a descriptive handle. Hence my AHNC name. All Hat No Cattle. Experience wise I'm still All Hat. The Cattle part may come, but it will take time and more patience from the guys here!:thumbsup:
Good luck with your rig!
