Which replacement discs to get

[toddt73]

I just bought an old disc harrow for 80 bucks. I greased the fittings and everything spins smoothly now. The discs look a little beat up. I see agrisuply carries replacements. They measure just shy of 17". Ill assume they are 18s and just worn down pretty good. What other criteria needs to match to ensure the right ones? Are they relatively universal? If axle size matters, do I just pull the outer disk and measure the center opening in the disc. You can probably tell that I am new to all of this due to the likely wrong terminology. But please, if anyone could educate me, I would very much value any knowledge offered. Thanks!

Todd

 

[DeltaRed]

Those blades dont look bad to me. I dont see any broken.I would not replace,just run em. Yes 18" will do. Measure both the shaft and center hole.You have notched blades now. You can replace with smooth if you want.

 

[toddt73]

Those blades dont look bad to me. I dont see any broken.I would not replace,just run em. Yes 18" will do. Measure both the shaft and center hole.You have notched blades now. You can replace with smooth if you want.

Thanks! Is there in advantage to either notched or smoothed? I have very sandy soil if that matters. Lots of johnson grass that I am brush hogging now, but plan on plowing over to expose roots and rhizomes to winter. Not sure if that is important info or not.

 

[DeltaRed]

Thanks! Is there in advantage to either notched or smoothed? I have very sandy soil if that matters. Lots of johnson grass that I am brush hogging now, but plan on plowing over to expose roots and rhizomes to winter. Not sure if that is important info or not.

Notched appear to be self sharpening,but are more prone to rock breakage.They do a slightly better job in cornstalks.

 

[toddt73]

Notched appear to be self sharpening,but are more prone to rock breakage.They do a slightly better job in cornstalks.

Thank you very much. You've been incredibly helpful. Much appreciated.

 

[Fritz Maurer]

The idea behind notched blades for penetration. You don’t have much weight there so I’d stay with them if you can. But the trade-off is, they don’t wear as long as round blades.

I agree that you should just run them as is, unless they are damaged that we can’t see.

 

[toddt73]

The idea behind notched blades for penetration. You don’t have much weight there so I’d stay with them if you can. But the trade-off is, they don’t wear as long as round blades.

I agree that you should just run them as is, unless they are damaged that we can’t see.

Thank you very much. You folks are so helpful here.

 

[Brownie450]

If you have an angle grinder you could sharpen the edges
to improve cutting action. Sharpening probably won't last
more than a year, but will let it cut better. New blades will
be the best.
Jim

 

[toddt73]

If you have an angle grinder you could sharpen the edges
to improve cutting action. Sharpening probably won't last
more than a year, but will let it cut better. New blades will
be the best.
Jim

I'm actually going to do just that. I have to clean the edge on my rotary cutter blades. Might as well clean up this disc. I'll use it as is for now, but I will probably replace them in the not so distant future. I'll see how it works first. Thanks!