Splined Coupler

Inno · Oct 23, 2017

Acquired a nice snowblower for an even nicer price but it needs a bit of refreshing before I start using it. There is a splined shaft that connects to the driveshaft for the auger. The coupler is completely stripped out. Previous owner tried to weld it unsuccessfully. Being as how I have to take it apart I'm replacing some bearings and a drive chain etc. which I'm not having too much trouble finding but the splined coupler has me stumped.
The splined shaft is 1 1/4" in diameter and I count 20 splines on it. I have searched all the regular places (surplus center, mcmaster-carr and others) I would look for drive line parts online and can't come up with anything. I don't really want to weld it and I don't think that drilling and putting in a pin would be a great option but I'm open to suggestions on either a repair or somewhere I might find a coupler.

el6147 · Oct 23, 2017

If you are unable to find what you are looking for, I have repaired similar parts by boring
the housing or coupler and broaching in a key way and then carefully building up the shaft
by welding and then cutting in a key way on the shaft, then drill and tap for two set
screws 90 degrees from each other in the housing or coupler

markiz41 · Oct 23, 2017

If at all possible, replace the whole thing with a flex type (3 part) coupling. Most likely the splines got stripped is because the shafts are not aligned.

Inno · Oct 23, 2017

(quoted from post at 12:42:45 10/23/17) If at all possible, replace the whole thing with a flex type (3 part) coupling. Most likely the splines got stripped is because the shafts are not aligned.

Ah, that is a very good point! I will look for something like that. One shaft is 1-1/2" and the other is 1-1/4", I think I can make something work.
I'm replacing some bearings as well and haven't had any luck locally sourcing them. Might have to get a bit creative with that as well.

jeffcat · Oct 23, 2017

It is called a LoveJoy coupler. We use a lot of them at work.

Tracy Brown · Oct 23, 2017

Lovejoys are great if the RPMs are high. They get pretty big on low RPM applications. I recently redid a coupling where I wanted to use Lovejoy but ended up using 2 sprockets and a double chain to connect them due to HP/speed requirements.

Brown Swiss · Oct 24, 2017

Love joy would work also a chain coupler would work also, since you said the two shafts are different size.

guido · Oct 24, 2017

Hello Inno,

Why not a soft bolt? Sounds like there is no sheer bolt in the augers, or someone put in a High tensile strength replacement bolt. Drill it a use the new hole as a sheer point, by using a soft bolt. It will be the first thing to go,

Guido.

Inno · Oct 24, 2017

I've been looking at lovejoy couplings, think that's the way I will go. Far as putting in a soft bolt as a shear point, it already has two other shear points. If I put another one in that'll slow down the troubleshooting when I hit something solid :lol:

Splined Coupler

Inno

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el6147

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markiz41

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Inno

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jeffcat

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Tracy Brown

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Brown Swiss

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guido

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Inno

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