4720 Capability

[jenkinsph]

An "8 ft disk" as a description is not enough of information to provide an answer.

It would depend on the weight per blade, diameter of blades and the amount of set; then the soil conditions should be considered.


If you can pull an 8 ft disk in 8th gear with a 4120 it can't be doing much good.



Steve

 

[wolc123]

Compared to the 3 pt, 7 foot, Ford disk I own, This 8 foot pull type is nearly twice as effective on each pass and pulls half as hard. That is the difference between a good pull type and a 3 pt disk. This disk looks like it probably dates from the late 40's or early 50's. It has 8 positions that are controlled by pulling a rope from the seat, and backing into it to get a steeper angle setting. The 4120, easily pulls it at the steepest setting in 8th gear. At the steepest setting it makes my aprox 20 hp (engine) Allis Chalmers C grunt a little in 2nd gear at 4.5 mph and is probably a little on the large size for that tractor, but straighten the angle a couple settings and it does fine. It is just about perfect size for my aprox 30 hp (engine), Ford 8n which pulls it fine at high rpm in 2nd gear at 4.5 mph at the steepest setting. Even though it is way undersized on the JD 4120, I use that tractor on the first several passes because fuel consumption is less than half of those other 2 tractors (due to much more efficient 4wd and deisel power vs 2wd, gas). Also, those other tractors lack power steering which makes disking a little rough on fresh plowed ground. This disk has weight boxes above all four gangs and I just run a couple concrete blocks on top of the front two. Years ago we had an 8 foot bissel that worked almost as well but left some ridges in the field and required leaving the tractor seat to adjust. This disk does a better job leveling a field than any I have used.

 

[jenkinsph]

You can pull a drag disk easily, small blades and light weight made for low hp tractors.

Today you can buy 8' disks with 16" diameter blades and about 30 lbs per blade that allow shallow penetration and can be pulled by a 35-55 hp tractor.
Or if you need deep penetration say 9" depth you can go with an 8'6" offset disk with 26-28" blades and 225 lbs per blade and can be pulled with a 70-100 hp tractor.

What you can pull width wise depends on what you need to do, scratch the surface or plow deep.


For most of the CUT tractors users participating in this forum a 3 pt disk is okay, the larger pull type disks require larger tractors to be very effective.


Steve

 

[jenkinsph]

For my 4520 I went with a 673 tiller and can get aound 7" working depth and barely cover my tracks. For a 4720 I would go with the 681 allowing a little extra width to keep the wheels on firm ground while still allowing for limited overlap.


Steve

 

[AKfish]

An "8 ft disk" as a description is not enough of information to provide an answer.

It would depend on the weight per blade, diameter of blades and the amount of set; then the soil conditions should be considered.

Steve

Very true... However, I used to pull a 12' JD disc with my uncle's old, JD 730 diesel popper (same pto HP as a 4720). Now, it wasn't one of those discs with the big, honkin' slotted blades that would cut sod - but, after 3-4 passes I'd be draggin' the gang axles thru the dirt; not over it!

That's the key... just a few more passes and you'll be as deep as you need to be!

AKfish

 

[jenkinsph]

Very true... However, I used to pull a 12' JD disc with my uncle's old, JD 730 diesel popper (same pto HP as a 4720). Now, it wasn't one of those discs with the big, honkin' slotted blades that would cut sod - but, after 3-4 passes I'd be draggin' the gang axles thru the dirt; not over it!

That's the key... just a few more passes and you'll be as deep as you need to be!

AKfish

I can picture that easily a 730 2 cylinder was maybe 3-4 tons with 38" wheels.

Still there are differences between disks as mentioned. When my dad and I started out with tractors in the early 70's small light disks is all we had. Sometimes it seemed you needed a bloodhound to find where you went.





Steve

 

[farmboy12]

You can pull a drag disk easily, small blades and light weight made for low hp tractors.

Today you can buy 8' disks with 16" diameter blades and about 30 lbs per blade that allow shallow penetration and can be pulled by a 35-55 hp tractor.
Or if you need deep penetration say 9" depth you can go with an 8'6" offset disk with 26-28" blades and 225 lbs per blade and can be pulled with a 70-100 hp tractor.

What you can pull width wise depends on what you need to do, scratch the surface or plow deep.


For most of the CUT tractors users participating in this forum a 3 pt disk is okay, the larger pull type disks require larger tractors to be very effective.


Steve

I need to go just past "scratching the surface." So, I think I'd be pretty well off.

For my 4520 I went with a 673 tiller and can get aound 7" working depth and barely cover my tracks. For a 4720 I would go with the 681 allowing a little extra width to keep the wheels on firm ground while still allowing for limited overlap.


Steve

We would us a tiller, we already have a Befco, but we're talkin 10-15 acres here. What width are those two tillers mentioned?

Very true... However, I used to pull a 12' JD disc with my uncle's old, JD 730 diesel popper (same pto HP as a 4720). Now, it wasn't one of those discs with the big, honkin' slotted blades that would cut sod - but, after 3-4 passes I'd be draggin' the gang axles thru the dirt; not over it!

That's the key... just a few more passes and you'll be as deep as you need to be!

AKfish

Right. We could probably do what we need to do with one REALLY good pass, or two regulars.


Kyle

 

[jerrynycom]

I decided to get a bottom plow and a Kuhn 53/190 Tiller, the 73" model......Worked some land this weekend and was awesome! I have a video of the plow, but not the tiller.....

YouTube - Soil prep for deer food plot

 

[jenkinsph]

Kyle, the 673 is 73" and the 681 is 81". You can set them to run shallow and pull them faster too.



Steve

 

[Greyfields]

I pull 10' drawn discs with a 4120. I usually have 4WD engaged and take the loader off whenever doing field work. It's slow going on the first passes; so I just till (shallowest setting) or plow before discing on pasture I'm working up.