What size set screws to attach cultivators on A, Super A,

Richardin52 · Apr 13, 2010

I have a Farmall 140 and need to know what size the setscrews and what type of threads hold the cultivators to the tractor just behind the front end. I went to the local hardware store and could not find anything that seemed to fit.

I know it was the same for A's, super A's right up to the 140's.

Thanks

Rootsy · Apr 13, 2010

5/8 - 11

Use a grade 5 cap screw, turn or grind the first 2 threads off (to make a step) and use a jam nut to lock em in place once they are tight against the cultivator bar.

NawlensGator · Apr 13, 2010

I use 140's with cultivators of all types and don't have a set screw anywhere. I don't have a clue what parts you are trying to attach to what part, you'll have to be more specific.

All my blades, tips, furrows, etc are on round shafts with a latch/trip spring. The top of the round shaft goes up through a bracket that fits on the square bars that attache to either front sides of the tractor. This bracket is removable and about the size of your fist. A triangular rod threaded on the narrow end is hammered from the wide end to tighten up on the rod and square bar simultaneously and then the nut is tightened. There is a bracket for each cultivator.

It's really hard to explain without pictures/diagram, which you should search for and study.

NawlensGator · Apr 13, 2010

That bracket described above is called a cultivator clamp, and you can buy them from a IH/case dealer or on ebay.

Rootsy · Apr 13, 2010

Believe he is asking about the fasteners to hold the 4 bar linkage to the tractor. Not the clamp and wedge used to hold the standards to the toolbar...

ie the fasteners that go in these holes...

Richardin52 · Apr 13, 2010

Thanks Roosty I'll do that.

NawlensGator · Apr 13, 2010

Gotcha! Good Pic.

Rootsy · Apr 13, 2010

I want to clarify what I mean by the step on the bolt. When you clamp down those bolts you deform the ends and you cannot get them back out of the hole if you need to. The threads are deformed and too large. Therefore, if you put the bolt in a lathe and turn 2 threads or so down to the root diameter, essentially creating a step, you deform the end but don't expand threads (you have clearance now) and you can therefore get the bolt back out of the hole. If you don't have a lathe a grinder can be used in a pinch if you are careful

The jam nut is needed because no matter how hard you clamp those bolts down the vibration and banging will loosen them and you'll have to retighten every round. Learned this the hard way.

A 2" bolt is long enough. Actually about as long as you can use on the hole closest to the block / oil pan.

What size set screws to attach cultivators on A, Super A,

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