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What is a disc harrow?

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Topic: What is a disc harrow?
Posted By: Codger
Subject: What is a disc harrow?
Date Posted: 22 Jun 2023 at 10:04am
The subject may sound rudimentary to many but I've not knowingly seen one of these used and am looking for something to pull behind my 11B dozer to break up soil for planting next year? Is this something I should be looking for or something better or more efficient? I don't have a large farm tractor except my White 2-55 that is 2WD.

I will be removing a lot of small and medium sized trees later this year including the stumps with the dozer to return the ground to productivity. I'm thinking a hay crop being probably first next year.

Thanks, 


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Replies:
Posted By: Tbone95
Date Posted: 22 Jun 2023 at 10:34am
Well, it comes down to a regional and vintage thing where some people tag that word on the end of “disc”.

Disc harrow, spring tooth harrow, rolling harrow, spike harrow….so, harrow is a generic term for an implement that works soil. Unless you’re Canadian, then there’s light harrows and heavy harrows, …that work dirt.

Anyhow, there’s a tremendous variety of “discs” as there is also a tremendous variety of soil and condition of soil and lay of the land. So to answer your question, maybe.


Posted By: Codger
Date Posted: 22 Jun 2023 at 12:11pm
Thanks. Your response generates as many questions as answers. Basically I'm looking at uprooting and taking down about 350 trees in ground that hasn't been broken in over 90 years we know of. I've seen these things called disc harrows with fluted discs, curvature discs, straight discs, etc. Most I've seen have one set facing in and the next set facing out at opposing angles.  I've even seen some with teeth and discs, and spring tines on the same implement.

The only "harrows" I've seen used in reality is ones they drag the ball diamonds with at the schools around here. One I'm sure is a spring type, the other a spike type but they are only smoothing with them using the same compact farm tractors they mow with.

I can get a relative to drive about 24 miles to do the groundwork as he does farm and has everything needed. The area is not opened up yet and a cabbed tractor will not ingress due to low canopy of the trees. I'm going to bulldoze a road through widening the existing ATV path but really want to rely upon others to the least. Don't mind purchasing something that will be needed routinely and I don't even know if this "harrow" implement is correct for the application. There is about 12 acres to be opened up and I don't want to use a tiller on the back of the tractor for it......

Thanks,




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Posted By: Ray54
Date Posted: 22 Jun 2023 at 12:44pm
A very big question that will get you many different options. The brands I am use to using are all gone, but knowing of the Rome company I used the search engine and found the AH series. Depending how big the brush growth is, it might all you need to take all of it out. A HD 11 would be plenty to handle the 10 foot wide model.But I don't know how the power shift transmission would like the constant load. We always used direct drive crawler for pulling tillage equipment.

Even if you have trees that need the blade to push them out a heavy duty offset harrow might be good on the clean up of smaller growth.

After the the initial tillage a chisel plow or field cultivator would be good at gathering the small limbs and roots that need to be cleaned up to make it ready harvest hay. Chisel or cultivator are basically the same tool just depth you wish to run them and the size of wood your raking up.  


Well both typing at the same time. And I missed the part what is it. With trying to leave rocks in the ground and not pulling them up.  A 9 inch spaced offset disc is standard tillage tool used most often.  So the search engine on the computer is your friend to see the differences. 

And with the added information of only 12 acres, unless money is growing on the trees buying a disc is lot of money to spend. Well at least extra heavy duty offset made to chop brush.

I used both to clean up after a vineyard removal here. A excavator was used to pick each vine out of the ground. Leaving a 2 foot deep hole on a 6 foot by 10 foot grid. In 3 passes, in 3 different directions with a chisel plow running a foot deep it was in a condition that you could drive it without falling in a hole. I then used the cultivator with more teeth closer together to finish smoothing it all out.




Posted By: Tbone95
Date Posted: 22 Jun 2023 at 12:51pm
Just as an example, with some looking I know for a fact I could find the old manual of the Minneapolis Moline “disc harrow”, the first ground working tool I pulled as a 8 or 9 year old kid. Sheesh that thing was old then and that was almost 50 years ago! It was about maybe 6 feet wide, no wheels, no weight to it. It wouldn’t do anything but make a clanging noise in your application. But it says “disc harrow” on that manual, I guarantee it! Others are like you say, fluted, straight, heavy, whatever.

I got a picture in my head of what you’re up against, and it might be all wrong. But I’m thinking maybe a heavy offset disc, followed by a root rake, then something to smooth things out. You’re going to have to look around and think over what you’re seeing.


Posted By: SteveM C/IL
Date Posted: 22 Jun 2023 at 12:59pm
Yeah the term disc harrow is what I call a disc. You need one of them heavy narrow notched blade disc they use on road construction sites. Something that will chop up large roots and not break.


Posted By: steve(ill)
Date Posted: 22 Jun 2023 at 1:04pm


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Like them all, but love the "B"s.


Posted By: Codger
Date Posted: 22 Jun 2023 at 1:14pm
Thanks guys. I have no experience working ground whether construction, or agriculture. I usually just repair the damaged items. This ground is hard and stays that way even after heavy rains. Lots of clay just under the surface. Not really something I want to spend a lot on, but do want to make it some kind of productive.

I've never ran a tractor with a root rake, (I assume you mean moldboard mounted) but wondering if that would be a worthy investment to both clean up, and initially break the ground? Dozer has a tilt blade and sharp corner bits and planning to use that a lot to break roots to push the stumps over on some of the larger trees. Nothing is hardwood any longer and almost all is less than 24" in trunk size. We had the oak, and hickory harvested several years ago and used these funds to build the storage building there now.

The adjoining farmland has since changed ownership and no access through the clearing any longer that existed since 1969 when this property was initially purchased. The new owners are not easy to get along with and most neighbors have ostracized them. We are landlocked on three sides with the only ingress/egress path being the county road bordering the front of the property.   


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Posted By: steve(ill)
Date Posted: 22 Jun 2023 at 1:47pm
since you have a Dozer, you might have more luck attaching a root rake to the blade instead of dragging something behind you....... then DISC afterwards.




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Like them all, but love the "B"s.


Posted By: steve(ill)
Date Posted: 22 Jun 2023 at 1:52pm


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Like them all, but love the "B"s.


Posted By: 200Tom1
Date Posted: 22 Jun 2023 at 1:58pm
Codger. We took moms farm out of CRP last year. Fsa office recommended beans the first year. This ground was some of the first to go into the program over 40 years ago. Mom had the trees dozed off and burnt. We rented it to a progressive young farmer. He came in and sprayed, then no tilled beans on 160 acres. He said he had a fantastic crop of beans. Mom limed the ground, something I would recommend you have checked out. He planted corn this year and will again next year. His corn crom started out looking great, but we sure need a good rain on it.


Posted By: DiyDave
Date Posted: 22 Jun 2023 at 4:38pm
If you can't find a root rake or a disc harrow, a good ripper, on the back of that dozer will pull out big roots real nice...Wink

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Posted By: Allis dave
Date Posted: 22 Jun 2023 at 5:21pm
I've seen and helped farm recently cleared ground without digging up all the roots.


cleanup all the roots and mess the best you can and run an offset disk over it simila to the one in the video above. clena up root on top again... Then disk again with a finishing disk and plant. If you continue to disk each year and don't run anything with shovels you'll pull up a minimum amount of roots and eventually 5-10 years later, those roots will desompose and be gone.
If planting to hay, it's even easier becasue you only have to work it once for about 5 years to seed your hay mix. Wiht hay you would want to do a good job of cleaning up root on top so you don't run them throguh your hay mower.


Posted By: Walker
Date Posted: 22 Jun 2023 at 6:31pm
Buy ya some surplus usgub Daisy Cutters from Joe. Ask him if he's got a B-52 that aint busy for application you can borrow too. Tell hm you'r Ukrainian.


Posted By: Dirt Farmer
Date Posted: 22 Jun 2023 at 11:36pm
Sent you a pm


Posted By: WF owner
Date Posted: 23 Jun 2023 at 5:14am
What I haven't seen said on this post, is that you will first need to (moldboard) plow the sod first, especially on old sod. If you had a very heavy offset harrow and went over it several times, you might get away with just disking, but a well worked seed bed is important when seeding legumes or grasses. Offset discs are very heavy and take a lot of power.


Posted By: Tbone95
Date Posted: 23 Jun 2023 at 6:49am
Originally posted by WF owner WF owner wrote:

What I haven't seen said on this post, is that you will first need to (moldboard) plow the sod first, especially on old sod. If you had a very heavy offset harrow and went over it several times, you might get away with just disking, but a well worked seed bed is important when seeding legumes or grasses. Offset discs are very heavy and take a lot of power.

You wanna plow through all those roots? Even after a root rake I might not wanna. Not until they start decomposing. No thanks.


Posted By: Codger
Date Posted: 23 Jun 2023 at 7:21am
[QUOTE=DiyDave]If you can't find a root rake or a disc harrow, a good ripper, on the back of that dozer will pull out big roots real nice...Wink[/QUOTE

My parts tractor has most of a ripper assembly on the rear still. The The tractor hydraulic valve, and ground tines are long gone, but those could be replaced easy enough. I'm not sure what kind of wear is in the framework however as never looked.

I almost feel there is enough need a root rake could be justified as they look to be something that is fairly easily mounted and dismounted to the blade. Most look to be about 12" depth of raking and about 1.250" AR400 steel constructed. I see them ready made on ebay and a few other sites.


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That's All Folks!


Posted By: Codger
Date Posted: 23 Jun 2023 at 7:34am
[QUOTE=200Tom1]Codger. We took moms farm out of CRP last year. Fsa office recommended beans the first year. This ground was some of the first to go into the program over 40 years ago. Mom had the trees dozed off and burnt. We rented it to a progressive young farmer. He came in and sprayed, then no tilled beans on 160 acres. He said he had a fantastic crop of beans. Mom limed the ground, something I would recommend you have checked out. He planted corn this year and will again next year. His corn crom started out looking great, but we sure need a good rain on it. [/QUOTE

For years we could not grow grass on the three acre flat area of the front of this property at all. When we harvested the hardwood back in about 2012 and opened it up quite a bit, we had several loads of lime hauled in and limed this area almost complete each year for the next three years. It grows grass readily now, and is manicured well. We did not till or do anything to the ground except broadcast spread the lime and seed with the Case VAC tractor kept down there. That tractor was our mower and workhorse for many years and now retired.

I expect this rear acreage we are conversing about will be about the same to get back to growing something besides weeds.....


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That's All Folks!


Posted By: WF owner
Date Posted: 23 Jun 2023 at 7:40am
Originally posted by Tbone95 Tbone95 wrote:

Originally posted by WF owner WF owner wrote:

What I haven't seen said on this post, is that you will first need to (moldboard) plow the sod first, especially on old sod. If you had a very heavy offset harrow and went over it several times, you might get away with just disking, but a well worked seed bed is important when seeding legumes or grasses. Offset discs are very heavy and take a lot of power.

You wanna plow through all those roots? Even after a root rake I might not wanna. Not until they start decomposing. No thanks.

I know what you are saying, but the point I was raising is there is going to be very thick sod in the area that is not disturbed taking out trees. A regular disc harrow is going to barely scratch that sod.


Posted By: Tenn allis
Date Posted: 23 Jun 2023 at 8:37am
Just finished clearing a 80 acre plot and I can share my experience. You could get someone with a track hoe and pull the trees and pile they do a good job and keep dirt out of the piles so they’ll burn. When they finish pull a heavy bog type disk with a drag to fill holes and level do not be afraid to cut it several times. Then comes the fun part picking up the roots root rakes are a good tool but if you run them to low you’ll get dirt in your pile and they won’t burn skim the ground and they work good and piles will burn but unless you have a pto driven rake to windrow the roots and a pull behind loader that picks up the windrows be prepared to pick up a lot of roots
I ended up buying a D7 with a cutting blade to finish this plot of land. After cutting 40 acres we mounted a root rake on the C-frame to pile and burn worked good got corn planted on part of it this past spring. On your last pace with a disk if you can pull a culti-packer it will help push the smaller roots back into the soil so they won’t interfere with your future crop


Posted By: Tbone95
Date Posted: 23 Jun 2023 at 11:16am
Originally posted by WF owner WF owner wrote:

Originally posted by Tbone95 Tbone95 wrote:

Originally posted by WF owner WF owner wrote:

What I haven't seen said on this post, is that you will first need to (moldboard) plow the sod first, especially on old sod. If you had a very heavy offset harrow and went over it several times, you might get away with just disking, but a well worked seed bed is important when seeding legumes or grasses. Offset discs are very heavy and take a lot of power.

You wanna plow through all those roots? Even after a root rake I might not wanna. Not until they start decomposing. No thanks.


I know what you are saying, but the point I was raising is there is going to be very thick sod in the area that is not disturbed taking out trees. A regular disc harrow is going to barely scratch that sod.

I get what your point is too.

I wouldn’t use a “regular “ disc. I’d go with something like a heavy offset, or breaking disc or whatever popular term for a similar thing. If the soil is set hard, plow might not even dig in.

All good.


Posted By: victoryallis
Date Posted: 23 Jun 2023 at 12:23pm


Spray it asap with roundup that will get the sod rotting down.


Cut a decent road in.

Hire someone with a nice heavy disc chop up the smaller roots and so forth.   Most of the older smaller discs simply don’t weigh enough.   

Go a couple years of corn till things rot down some.  BTDT  Hayfields you want putting green smooth 

Once you get it broke up use a field cultivator to shake it apart.  


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Posted By: Coke-in-MN
Date Posted: 23 Jun 2023 at 1:28pm
I cleared several areas of small trees with dozer blade , then went in and pulled a 2 bottom plow through area to bring up roots left after removing the trees . 
 Next a 4 gang disc run over area to break up any other clumps and bring some roots back into soil or exposed to be picked up . 
  A friend made a ripper tooth that mounts over the dozer blade of his machine and used it like a root rake (he made 5 of these) and they just hang over blade , when he back drag they pivot outward and just drag on the ground but going forward they dig in 

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"Challenges are what make life interesting; overcoming them is what makes life meaningful."


Posted By: Codger
Date Posted: 23 Jun 2023 at 8:56pm
Thanks guys. Was speaking with my uncle this afternoon and he says if I'll get an access road cut through he'll get the ground work done after the trees are removed. Another friend has an older Hein-Werner excavator and is willing to take the trees out to help me out too. If I go this route, I can see a root rake being beneficial as well as some tillage equipment to maintain and use into the future. I will also be able to use the dozer quite a bit in the project. I purchased an 8-1/4 yd dolly wheel ejector scraper for relocating some dirt to flatten off some of the ruts and falloff of the edges to reclaim more ground also. 


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Posted By: Lars(wi)
Date Posted: 23 Jun 2023 at 10:08pm
Just to throw this out, does the timber have value?

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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.


Posted By: Codger
Date Posted: 23 Jun 2023 at 10:12pm
Originally posted by Lars(wi) Lars(wi) wrote:

Just to throw this out, does the timber have value?


No, I don't believe so; it is just soft maple and other soft woods. There are some red oak sapplings, and we have been attempting to transplant them, but still quite small.


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Posted By: steve(ill)
Date Posted: 23 Jun 2023 at 11:05pm
you might check with the local tree cutter crew... Maple is used for furniture, pallets and other.. The might be willing to cut them down and take the logs ( get some $$ or just free _) so you dont have to stack and burn........ easier to push the branches up into a pile afterwards.. Tell them to leave the bottom 5 ft for stump removal with the hoe or dozer.

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Like them all, but love the "B"s.


Posted By: Codger
Date Posted: 24 Jun 2023 at 5:43am
Originally posted by steve(ill) steve(ill) wrote:

you might check with the local tree cutter crew... Maple is used for furniture, pallets and other.. The might be willing to cut them down and take the logs ( get some $$ or just free _) so you dont have to stack and burn........ easier to push the branches up into a pile afterwards.. Tell them to leave the bottom 5 ft for stump removal with the hoe or dozer.


That is an idea. We had a pretty difficult time with the hardwood citing limited access for equipment, but we don't have that access available any longer. If I get a road cut in and the creek bridged, the possibility is there for certain.

This is my project "Man Lift" I'm currently working on. Main lift cylinder leaks badly so sending it in for rebuild. Hope to pick it out this morning while still cool outside with the skid steer. Photos were snapped yesterday after I was really tired working in the direct sunlight most of the day:



I welded these grab hooks onto the boom forward of lift pin mounting and offset the hooks 15 degrees leaning in at the top, and 25 degrees in at the bottoms to lessen the angles pulled upon by the bridle chain attached to my Mack winch tractor:



This actually seemed to work pretty well and is very stable with the rotation lock engaged. The tractor is butted against the rear counterweight and the cable is one inch so quite a lot of strength there:



Again, hoping to pick the main lift cylinder out this morning but it is very heavy. I think 8" bore and about 40+ inches of stroke with a 3.50" rod. Now is the time I wish I'd gotten off my "duff" and put the freshly rebuilt engine back into the forklift.....


Working by my lonesome so all three of my personalities come to bear, I get things done albeit slowly.

Most every time my son has been down there cutting trees they get wrapped around and into the others in close proximity so planning to take this down there and "top" them first.


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Posted By: steve(ill)
Date Posted: 24 Jun 2023 at 8:59am
Working by my lonesome so all three of my personalities come to bear, I get things done albeit slowly.

Been there, done that... I tell the wife the easy things get done quickly.. the impossible take a little longer..... nice rigging on the boom !



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Like them all, but love the "B"s.


Posted By: Codger
Date Posted: 24 Jun 2023 at 9:12am
Skid steer does not have the capacity to pick the cylinder out. I tried and could only lift it just off the lower trunion mount but no further. I'm going to attempt to borrow a forklift and use the extension I build for this purpose from a section of old 4" I beam and a grab hook welded on. Here is the test jig with it clamped to my skid steer forks. Easily lifts rear wheel clear of the ground without budging the cylinder:


Thanks for the comment on the rigging. One of these days I'll learn to trust my welds.....


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Posted By: Ray54
Date Posted: 24 Jun 2023 at 1:15pm
Getting a better picture of what you have, and where you want to go. A lot of orchard removal out here has gone from a dozer to the excavators. Granted almond and most fruits trees will be smaller than what you have. But pulling stumps with a large excavator with thump leaves more roots attached to the stump, so less to be picked up out of the field. Using a root rake on a dozer is still the faster way to stake brush for burning.


If you are going to use your dozer to take trees down, the old times here rather have the whole tree than a stump. The idea being the top of the tree provide extra leverage to help pull the tap root out of the deep rooted trees. The excavator it doesn't make that much difference. Not that hard to dug down and cut roots off a stump. Just things to consider as go forward. 


Posted By: Codger
Date Posted: 24 Jun 2023 at 7:30pm
Thanks Ray and I think I'm swinging more the way of an excavator also. Much faster than a dozer and further justification for the root rake is there. Still a lot that son and I can accomplish but hiring some of it out would ensure it got done timely. 

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Posted By: Codger
Date Posted: 24 Jun 2023 at 7:45pm
Decided against borrowing a forklift after remembering just how unfair the payback requests were the last time. Instead, went out behind the building and into the trees got my old crane truck running which has been setting dormant four years or so. Had to touch up the points to get spark and the carburetor will need rebuilt tomorrow so it will continue to run, but it started relatively easy and I was able to massage it towards the building.

Hydraulics livened right up but I need to get a pail of hydraulic oil tomorrow as still short some. I put this truck together back in 89 from a 56 IH S-160 pole setter, and this 65 R-190 which was a single axle road tractor. The RD-450 gas engine runs well, (usually)  and doesn't use oil. The boom swings 90 degrees to each side and back in 2004 I was loading scrap cars and the left outrigger/stabilizer sunk suddenly and over the truck went. It was slow so I was able to jump clear. Nothing damaged except truck and pride with that one. I have a photo of that on the office wall at the shop. I righted the truck with my skid steer with a fork under the upper boom and up and back onto the wheels she went. After refilling the crankcase it fired right up and I went into the shop and cut the crushed door off. Really rough old truck but still usable. I swung a lot of cabs with this truck prior to having the shop gantry crane.

 Once I get this going again steady it will pick that cylinder right out and swing it clear.


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Posted By: Codger
Date Posted: 25 Jun 2023 at 7:50pm
Got the boom up to this point but can't keep the truck running any longer:


Pulled carburetor and it's a mess internally. And to think I rebuilt this in April, 1992:



After an hour or so in the Methylene Chloride bath:



I'll glass bead the iron castings tomorrow and it will look quite nice. All passages blow clear now.

Hope to have it back running tomorrow and pick the cylinder clear of the chassis as the rebuild shop is set to pick it up on Tuesday sometime.

Air compressor will require a rebuild gasket set as far too much of the gaskets came apart during disassembly. I scraped mating surfaces clean and was able to free up both unloaders, and unloader caps as they were stuck from the out of service duration. The compressor was getting slow to build air for the last several years so this may have been an upcoming problem regardless.


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Posted By: steve(ill)
Date Posted: 25 Jun 2023 at 8:06pm
the more TOYS you got, the more REPAIR work to do.......... always something !

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Like them all, but love the "B"s.


Posted By: Codger
Date Posted: 25 Jun 2023 at 8:22pm
Originally posted by steve(ill) steve(ill) wrote:

the more TOYS you got, the more REPAIR work to do.......... always something !


Oh man.....


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Posted By: IBWD MIke
Date Posted: 26 Jun 2023 at 8:03am
Originally posted by steve(ill) steve(ill) wrote:

the more TOYS you got, the more REPAIR work to do.......... always something !

That has got to be one of the truest statements I have ever read!!!



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