John Deere M Starter Set Screw

RoeFarmall · Feb 1, 2021

I am working on my next project, a 1947 John Deere "M". I have determined that the starter is bad and needs to be rebuilt. When I turn the nut which turns the mounting set screw for the starter, the set screw "shaft" sheared off flush with the frame. Upon further inspection, it looks like the previous owner tried to drill out the set screw and gave up. I have two pictures to show the result. What do you suggest that I do to get the "set screw" out so I can replace or rebuild the starter?

My thanks in advance

ET · Feb 1, 2021

Weld a nut on it.

James Howell · Feb 1, 2021

"[b:654c4848f0][i:654c4848f0]What do you suggest that I do to get the "set screw" out[/i:654c4848f0][/b:654c4848f0]"

Take a look at the photos below.

The special set screw is designed to be removed with an Allen wrench.

You might consider welding an Allen wrench to the broken end of the special set screw.

Hope this helps.

RoeFarmall · Feb 1, 2021

Thank you, sir. As I mentioned, when I turned that hex nut, the set screw sheared off level with the frame. I was seeking some advice on you to remove it in this state. Thanks for your response, I appreciate it.

rrlund · Feb 1, 2021

Weld a flat washer to it. Lay the bead on the inside of the washer. Then weld a nut to the washer. Weld on the outside of the nut. If you get too much weld on the nut and can"t get a wrench on it, grind the weld down with an angle grinder. The heat from the welding will loosen it up.

RoeFarmall · Feb 1, 2021

Thank you for your response, sir.

Hotflashjr · Feb 3, 2021

You can get a cheap set of allen wrenches almost anywhere. Saw a set at Tractor Supply the other week for $10. I would personally try making one fit in the hole that is drilled with a little grinding and a hammer. If you can get a tight fit the banging getting the allen wrench to fit should have helped loosen the screw up a bit. Might just work.

Not all of us have a welder handy so this would be my current option.

DoubleO7 · Feb 3, 2021

(quoted from post at 21:39:24 02/01/21) Weld a flat washer to it. Lay the bead on the inside of the washer. Then weld a nut to the washer. Weld on the outside of the nut. If you get too much weld on the nut and can"t get a wrench on it, grind the weld down with an angle grinder. The heat from the welding will loosen it up.

I would do it the rrlund way.

If the broken part is at the correct depth and you do a nice job of welding, you could reuse it with the new starter.

I prefer to use a big hex nut and weld it up on the inside.
Crank up the heat and fill the washer and nut to the top.I
The extra welding time really puts some heat into the broken part.
Let it air cool and then about the time it no longer removes your finger print hose it down under the washer with PB Blaster.

RoeFarmall · Feb 4, 2021

James,

In the picture that you displayed of the set screw and jam nut, are they off of your tractor or did you procure them. I am having a difficult time trying to find the set screw, L 4168 T. Do you have a source, sir?

My thanks.

Jim.ME · Feb 5, 2021

Have you tried your JD dealer? You could get a longer square head set screw, of the right thread, and have a machine shop make a taper to match the old one, on the new one. The new screw needs to be long enough to allow for the lock nut between the casting and set screw head.

RoeFarmall · Feb 23, 2021

Just wanted to let you know that I tried your idea and I managed to free the stud! I really appreciate your advice. Since this part is obsolete, I have decided to go ahead and make a replacement.

John Deere M Starter Set Screw

RoeFarmall

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ET

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James Howell

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RoeFarmall

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rrlund

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RoeFarmall

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Hotflashjr

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DoubleO7

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