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Disc harrow question

P

perryjosh64

Member
Folks I recently have been enjoying the fun of repairing an old Ford disc harrow. I ended up getting straps w/straight bolts to replace some U bolts due size needed evidently not a standard size and could not find them anywhere other than online.
Anyway plan was to replace front blades with new ones and replace 2-3 broken/worn blades on the back with the better of the old frond blades thinking they were the same size...they were not? Seems rear blades are 19-20in while front blades were. What is the purpose/belief in putting bigger disc on rear/smaller in front other than that was what was available?
 
Don't know as they were originally that way. Fronts are usually smaller because they wear faster than the rears because they are breaking the hard ground whereas the rears are cutting over ground that has already been loosened by the front blades. Make sense?
 
I forget what model you had but unless you had a very heavy duty disk you did not have 20" blades, normal was 18" and front blades wear twice as fast as rear blades. And all disks came with same size on both front and rear. Actually for years 16" blades were normal and the thought at that time was they did better work but that was finally proven wrong, but 20" blades are to big for field finish work unless you have a 9" blade spacing.
 
Typically front blades wear down a little faster.

Farmers, more so back in the day, were pretty frugal and would replace the front or back set of blades when wore down, not all of them at the
same time.

I would guess your fronts wore down, got replaced. Then the rears got small, and replaced, so now the rears are bigger then the fronts.

Paul
 
Folks that's why I asked the question. The front were 18 inch while the back disc were 19+ inch with wear? Just wondered if there was some belief/concept of having bigger disc on rear?
Anyway guess I'll roll with what I got until more break off and replace the rear disc with 18in.
 
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