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 Peerless 820 improved straight axle hub

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Wheelinhorse
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PostSubject: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 3rd 2023, 4:45 pm

I have a clutch abuse issue. So I had to design a new 820 locker. The typical 820 doc locker does not work for me as it does not provide enough axle key engagement. If you actually go and build this thing, please post yours. I'd love to see it. I will post pics of mine once it's completed.

Little tykes assembly
Peerless 820 improved straight axle hub Lockas10

Here's the locker hub itself. You will want to use a full length 1/4" key for the axle. The two keys that transfer the load from the bull gear to the hub are 5/8" tall by 3/4" wide by about 1.3" long. I would have gone 3/4x3/4 but i didn't like how the bottom of the keyway got down into the 2" diameter.

It would probably be a good idea to tap a few set screw holes to stop the axle from sliding around in the case/locker. I would recommend tapping them where they will wind up underneath the side plates, so if they loosen up they can't really go anywhere.
Peerless 820 improved straight axle hub Lockis10

Front view of the hub. Those two dimensions should be the same but mastercam is goofy and rounds things different ways. .0001" isnt an issue either way.
Peerless 820 improved straight axle hub Lockfv10

Right View
Peerless 820 improved straight axle hub Lockrv10

Here's the print for the keys, how I did them. I screwed up and made my hub too narrow and had to bolt the keys into the slots to center the hub in the carrier. Drill and tap hub for 1/4" socket head capscrews, and drill .1875" (3/16) for roll pin. Spacing same as key and centered on the center section of the hub. It's a nice idea to bolt the keys in but not necessary at all. You can just cut a piece of 5/8x3/4 about 1.3" long and stick it in the key slots
Peerless 820 improved straight axle hub Key110


Personally I bored my factory side plates up to 2" to fit the locker, but I drew up new side plates anyway. NOTE that two of these are required, one with tapped holes and one with clearance holes.

Right view
Peerless 820 improved straight axle hub Plater10

Front view. The only thing critical in terms of thickness is the .094" dimension, it sets your side play for the bull gear.
Peerless 820 improved straight axle hub Platef10

Just for fun, here's some dimensions on the bull gear. 7DP is an odd pitch for gears, I figure the designers used it just because that's what tooth count they needed in a certain diameter to fit in the transaxle.
Peerless 820 improved straight axle hub Bgrv11

Peerless 820 improved straight axle hub Bgfv11


Last edited by RichieRichOverdrive on December 16th 2023, 9:59 pm; edited 2 times in total

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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 4th 2023, 7:18 pm



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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 4th 2023, 7:26 pm

RichieRichOverdrive wrote:


as our good friend project farm would say: "Very Impressive!"

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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 6th 2023, 10:39 am

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Wheelinhorse
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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 6th 2023, 10:44 am

This is so cool! And so far above most of our heads haha

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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 13th 2023, 8:52 am

Whether or not you’re doing a fancy locker like me, through bolting is a must if you plan on putting any power through your 820

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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 13th 2023, 10:44 am

Literally the first thing I did post locker.  I don't think I changed the couple around the brake cutouts or not, but all the other were, and I did also install nuts on the opposite side.  I splurged a bit and used full threaded stainless bolts.

Peerless 820 improved straight axle hub Img_1363


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Peerless 820 improved straight axle hub Sig213Peerless 820 improved straight axle hub Sig313
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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 14th 2023, 5:58 pm

The only problems with socket head bolts is you have to clean the mud out of them to take them out lol. That was kind of a pain on my last disassembly.

Added the drawing for how I did my keys to the first post.
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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 15th 2023, 11:07 pm

Figured I’d put all the build pics I got into one post.

First side drilled and outside turned
Peerless 820 improved straight axle hub 4d4a6e10

Gear fits
Peerless 820 improved straight axle hub 8439ca10

Boring first side
Peerless 820 improved straight axle hub 5d6e9110

Second side in progress
Peerless 820 improved straight axle hub B4950910

Lathe work done
Peerless 820 improved straight axle hub 6fda3610

Truing up cast surface of side plate so I can hold onto them better
Peerless 820 improved straight axle hub 11977a10

One bored side plate
Peerless 820 improved straight axle hub 89b8d410

Another side plate bored and what’s left of the original centers
Peerless 820 improved straight axle hub E6348310

Cut flats on the hub so I have something nice to hold onto and can just flip the part to do keyways 180* apart
Peerless 820 improved straight axle hub 87c1d410

Cutting keyway
Peerless 820 improved straight axle hub 72741710

Both keyways cut
Peerless 820 improved straight axle hub Ca32df10

Key bolted into bull gear with 1/4-28 SHCS with hole for roll pin in center
Peerless 820 improved straight axle hub C4470d10

Center keyway cut in my shaper
Peerless 820 improved straight axle hub Db57ab10

Here you can see the tapped holes and roll pin hole for the key, as well as 4 of the 6 set screw holes. Two of these holes are over the keyway.
Peerless 820 improved straight axle hub 65c80210

If you are building something this complicated for a mower you may have undiagnosed autism.
Peerless 820 improved straight axle hub C2230e10

May as well leave my signature Very Happy
Peerless 820 improved straight axle hub 0259e610

In case with axle
Peerless 820 improved straight axle hub 68395a10

Bonus information. There’s about .15” extra space between the hub and bearings. This also applies for the stock carrier setup. A pair of .07” thrust washers would leave .01” side play, but a pair of .0625” (1/16”) is probably more common and would leave a still reasonable .025” of play. Don’t shoot for 0 play, there has to be something.
Peerless 820 improved straight axle hub 3490b310

The 820 case is right around 19 5/8” wide, this will hopefully help whoever is looking to figure the straight axle length they want.
Peerless 820 improved straight axle hub 26177810

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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 16th 2023, 5:19 am

@RichieRichOverdrive Hands down the best tool making and engineering work I've seen put into an 820 ever!
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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 16th 2023, 1:50 pm

Thank you for the pictures, it makes the drawings much clearer. I could not figure this out the first time

"You will want to use a full length 1/4" key" as I thought you might have meant 3/4". Now I see what you meant with the set screws.
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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 16th 2023, 6:47 pm

Thanks @Crazy_Carl I’m not in a hurry for once so I figured I may as well try to do a nice job of something lol.

@JB_4x4 glad that cleared something up for you. If you or anybody else wants any clarification on things don’t be afraid to ask. My drafting skills are just meh haha. I wouldn’t have even tried to draw all this stuff up if I didn’t want to share it with you guys. I’ve done more complicated stuff just off the top of my head working from memory hahaha.

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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 16th 2023, 9:36 pm

That's the toughest looking piece of kit I've ever seen, great job and thanks for sharing so in depth with us!


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PostSubject: Re: Peerless 820 improved straight axle hub   Peerless 820 improved straight axle hub Icon_minitimeDecember 19th 2023, 9:16 am

Apiece of artwork thats a shame will be hidden!
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Peerless 820 improved straight axle hub Empty
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