JD KBA disk again

Southern Ray

Well-known Member
OK I stand corrected, the disk is a JD KBA. The width, disk to disk, with the gangs closed is 12 feet 5 inches.
What I am curious about is the type or amount of linkage needed to connect the cylinder to the rock shaft.
This was always a drag type disk. Logic kept telling me the front pillow block is for a hydraulic cylinder.
For awhile I thought it could use a cylinder to open and close the gangs.
It must have taken an extremely long cylinder or an elaborate set of linkage to drive the rock shaft.
Anyone with any pictures or literature?
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To me a rock shaft is on the back my tractor that the lift arms mount on. What is a rock shaft to you? What is a pillow block to you? to me it is a mount for a bearing to support a shaft. It seems that you may be asking about putting wheels under it. I used to have a KBA of that same size with wheels. You need to mount the axle and arms and wheels in between the gangs where you don't have room for them. You will need to open up the space between the gangs. The cylinder would run from an arm welded to the axle forward to a mounting point at the top of the two curved parts that the drawbar attaches to. In order to adjust the down pressure forward or back between the two gangs, you would have a linkage that is adjustable in length with a screw and hand crank that extends forward from the crosspiece between the two curved drawbar mounts, to the double brackets standing up near the front of the drawbar.
 
That piece on the front of the toung does not belong on there. To set you pull up on the little lever to reliece the pin and either pull forward or back up to get that pin to drop in the holes as the spot it will give you the angle you want. That disk is not made for a cylinder. Some were made for a cylinder but not that one. And the way to measure the cut is with it full in gear and measure from center of back blades from one side to the other. An 8 blade is 9'10", a 9 blade is 12'2' and a 10 blade is 13'6". You try to put a cylinder on and you will bust it all to pieces.
 
Somebody was going to be ingenious and put the front cyl mount on it,but all u need is a rope in the back horseshoe piece, pull on it, and back up, it will open the up the disk to field working position!!
 
(quoted from post at 22:59:19 03/19/18) That piece on the front of the toung does not belong on there. That disk is not made for a cylinder. Some were made for a cylinder but not that one. You try to put a cylinder on and you will bust it all to pieces.

I agree with Leroy the piece welded to frt of tongue with a hole is not factory installed but aftermarket . Drag KBA had no hyd cylinder. Below is footnote from KBA parts catalog for number of disks per disk shaft for each size of the larger disk harrows.

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I hate to disagree with the rest of you but their was a cylinder kit available for the drag type kba and also jba disks. The bracket on the tough looks factory but it looks welded. All I ever seen is bolted. But maybe on the large disks they were. There is a U shaped bracket or a pyramid shaped one on the larger disks that attaches in the front of the two angle irons in the two blind holes. It should be in the parts book but I'm not sure. But I have one on my disk. And Its a drag type KBA. They had them on the disks by 1947. I have a John Deere film that shows one in operation behind a B.
 
You are 100% correct that Deere made a factory kit to angle the KBA pull type disc. I have one somewhere and also have some factory sales brochures that show them. They made them for farms that had waterways so you could straiten the gangs when crossing. Tom
 
(quoted from post at 07:57:57 03/20/18) I hate to disagree with the rest of you but their was a cylinder kit available for the drag type kba and also jba disks. The bracket on the tough looks factory but it looks welded.

Thank you mjjohn I stand corrected in that a hyd cyl bracket was available for KBA less wheel carrier.

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Thought a rock shaft is a shaft that rotates, like attached to wheels to lift a disk off the ground.

A hyd cyl cobbled on to that rope hitch would seem to be a good way to bend some iron that shouldn't be bent. Don't see where the other end of the cyl attaches to?

Paul
 
I did not say they did not have a unit made for a cylinder, I just said his disk did not have it and went no farther as to make more confusion. I would have liked to have had it on mine but did not.
 
(quoted from post at 09:58:33 03/20/18) I did not say they did not have a unit made for a cylinder, I just said his disk did not have it and went no farther as to make more confusion. I would have liked to have had it on mine but did not.

Really? :roll:
 
Many thanks for the responses and for that enlightening information.
I struggled with the name pillow block. I just didn't know what to call that hunk of metal someone welded to the tongue.
Is it a buttress, backstop, tail-stop, or just bracket? I know what a pillow block is.
My dad bought this disk from another farmer around 1960. I would have been eleven at the time. I remember it being shiny and like brand new.
Yesterday I took my wire brush and went to make a closer investigation. The piece is defiantly factory but it is field welded in place.
The previous farmer must have know of the wheeled transport feature and decided to pursue it only to abandon it as impractical.
I'm sure the topic was discussed when my dad inspected the disk. He did not pursue the feature and I don't plan to either.
Many thanks to Tx Jim, mijohn and tomstractorsandtoys. The information you gave confirmed my suspicion that a cylinder could be used to adjust the gangs.
I'll pass on that feature as well and will continue to use my hand-line to open and close the gangs.
I don't know what is the correct name for that horizontal beam for the transport assembly. I have seen 'rockshaft' used many times on these forums and accepted.
Back in those days the width in feet and inches was never an issue. Farmers farmed their crops in rows spaced at 38". This was just known as a four row disk.
Again thanks for the responses. I can finally put some closure to that mysterious bracket.
 

The cylinder bracket on your disk harrow tongue was for cylinder to angle the disk frames not for raising/lowering wheel carrier frame. Wheel frame utilized different cyl attachment points.

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Southern Ray and Tx Jim, When I checked my parts book I found out that the 12 and 14 foot KBA drag disks had their own front tongue with only one part number meaning they came with the cylinder mount weldment already attached. On all the smaller disks they come with a seperate assy Part number. Also Ray, they had a a taller tower on the back cylinder mount on the two largest disks. If interested John Deere might still have that part? The two brace rods could be substistued with two heavy angle-irons.
 

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