20 x 18 box frame disk harrow

   / 20 x 18 box frame disk harrow #1  

Sysop

Elite Member
Joined
Jun 7, 2013
Messages
3,301
Location
Fairmont, WV
Tractor
Mahindra 4035HST purchased 2013 - Husqvarna TS348-D purchased 2019 - Craftsman 42" HST purchased 2003
Went past a dealer's lot today and stopped to see what they might have some deals on and think I lucked out. He said he had an unused, old/starting to rust 20x18 disk harrow on a HD box type frame. Basically the same type of structure made by KingKutter and sold for $1700 on NorthernTool except it has an easier means of adjusting the angle of the disks.

He told me it was 5 years old, but got put on the back of the lot and had grass grow up through it a few (probably 3) years back and ended up forgot about... It has a bit of surface rust here and there, as well as on the disks. The paint is faded. All the welds look good and none of the rust is what I'd consider severe. Anyone have any qualms about paying $700 for a new unit left in the weather in tall grass for a few years?
 
   / 20 x 18 box frame disk harrow #2  
Heck no! That seems like a great price to me. How wide is it?
 
   / 20 x 18 box frame disk harrow
  • Thread Starter
#3  
6.5', same as the KK above. I'll hope to have pics shortly.
 
   / 20 x 18 box frame disk harrow #4  
Price sounds OK, you can always touch up the paint. Be sure it has sealed bearings like the King Kutter, not white metal bearings that you have to grease twice a day, unless you plan to use it very little. You want the 7.5" spacing for finish work. If it adjusts with a screw mechanism be sure it's not froze up with rust. Weight will tell a lot about quality and strength. The King Kutter in your link says 820 lbs. with 20" blades, so the one you're looking at with 18" blades should be only a little less than that assuming it has same 1" axle size.

Good luck if you buy it, sounds like a very good price.
 
   / 20 x 18 box frame disk harrow
  • Thread Starter
#5  
Good catch!,, I didn't pay close enough attention on that KK and was mainly looking at the design of the structure rather than the disc size. Here is the KK with 20 18" discs.. It is listed as 790lbs.

Adjustment is similar to the KK except instead of having bolts in the parts that slide along the center beam there is an extra channel above the main beam with a bar connected to each of the adjustment frames and a single pin holding both. Instead of pulling two bolts to adjust, you just pull one pin. From there the adjustments are the same.

It is sealed bearings, 1" axle, and 7.5" spacing also.
 
   / 20 x 18 box frame disk harrow
  • Thread Starter
#6  
Disk-Front.jpg

Disk-Rear.jpg

Disk-Adjustments.jpg


Now with pics to examine and stuff looked up, it is a 400 series Mahindra 20x18" disc. Not quite as heavy duty as the KK as the KK is 3x3 tube and the Mahindra is 2.5x3 and weighs 715lbs. Although not only do I like the adjustment better, the bracing around the lower pins on the KK are just gusseted angle where on the Mahindra it is more of the 2.5x3 box tube as gusseting...

I think $700 is a steal and I'm jumping on it come morning... Anyone disagree?
 
   / 20 x 18 box frame disk harrow #7  
I think $700 is a good deal on that. I'd consider that a medium or medium/light duty harrow - better than the angle iron frames but not as heavy as the heavier duty box frames on some of them. But still, at $700 it's a no brainer. You could use it a while and sell it and probably make a little profit or at least get all your money back.

Tractor Supply's box frame disc appear to be a little heavier built, but it's $1,350. Heck, even their 6' angle iron frame one is $900.

Wish I could find a deal like that. Go for it. I would raise it up and spin the gangs and make sure you don't have a bearing or two frozen up from sitting for years.
 
   / 20 x 18 box frame disk harrow
  • Thread Starter
#8  
Your TSC must carry different/better stuff on the heavy end. Here their 6.5-7' heavy duty harrow 20x18 SKU 2128278 is only 2x2 box tube frame and is $1500... I had ruled them out as they're made smaller than everything else.

CountyLine® Heavy-Duty Disc, 7 ft. Cutting Path - Tractor Supply Co.

Here the angle iron models are same as you mentioned, but having broken enough ground engaging tools with my tractor I don't even consider them an option.

Thanks for the input, I'm 99% sure I'm walking away with it in tomorrow. Anyone else have any thoughts or experiences with one like this?
 
   / 20 x 18 box frame disk harrow #9  
Disk-Front.jpg


Now with pics to examine and stuff looked up, it is a 400 series Mahindra 20x18" disc. Not quite as heavy duty as the KK as the KK is 3x3 tube and the Mahindra is 2.5x3 and weighs 715lbs. Although not only do I like the adjustment better, the bracing around the lower pins on the KK are just gusseted angle where on the Mahindra it is more of the 2.5x3 box tube as gusseting...

I think $700 is a steal and I'm jumping on it come morning... Anyone disagree?
Locate me another one like that and I'll have a $100 finder's fee for you!:D
 
   / 20 x 18 box frame disk harrow #10  
The lever adjust on pictured Disc Harrow is good because adjustment holes are in the lever, a non-structural part, rather than in the frame, which is the norm for clamp plate adjustment of Disc Harrows. See photos of 84" TSC Countyline by Tarter. Most Discs with 18" pans have same 3-bolt clamp plate adjustment.

The first time you lift your implement on tractor 3-Pt., take a mallet and 'ring' the pans. If any sound 'flat' the axle nut on that gang needs to be tightened. This is best done with an impact tool, but you can get the axle nut fairly tight with a big wrench. Limiting factor with a wrench is gang will want to turn, when it needs to be held stationary. Do not grease the axle threads; leave 'em dry.

Check for tightness fairly often at first. Once the Disc settles in, provided you have kept the axle nuts tight during the settling period, they usually remain tight.

More Disc Harrows require eventual pan or axle replacement because the axle nuts were not kept tight than for any other reason.

I inserted NORD-LOCK WASHERS from Sweden under the axle nuts of my Howse 16/18" Disc Harrow which kept the axle nuts tight almost 100% from the start. You can purchase NORD-LOCK WASHERS on eBay.

Monroe Tufline 18/20", twice as expensive as Howse 16/18", has double nuts on axles and the outboard nuts are staked in place. Photo #3.

Rear gangs look a little far apart. If you have a plateau in the field after you pass, slide rear gangs closer together. Lube frame first. I encourage movement of U-bolts with a soft-blow mallet. General rule for spread between rear gangs is pan diameter less two inches, i.e.: 16" spread between rear gangs having 18" pans.


I think $700 is a good deal on that. I'd consider that a medium or medium/light duty harrow - better than the angle iron frames but not as heavy as the heavier duty box frames on some of them. At $700 it's a no brainer.

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