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AC 720 / Simplicity 9020 Rear PTO Hub
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rustydollar View Drop Down
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Joined: 07 Aug 2017
Location: Manitoba
Points: 456 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rustydollar Quote  Post ReplyReply Direct Link To This Post Topic: AC 720 / Simplicity 9020 Rear PTO Hub
    Posted: 31 Aug 2017 at 5:18pm
Thought it best to give the rear pto hub a thread of its own.

The 3D cad work more or less completed, the fellow who did the work is unsure of the correctness of the internal involoute spline. Originally I was going to send my rear hub to the EDM shop, my Hub has some wear on the spline so the EDM shop suggested that I sent the shaft instead.

Told him the shaft was still installed in the transmission, he then offered to cut a sample spline to mail out to me for fitting.

I like his style, but have decided to remove the shaft from my transmission then send it over to him so there are no mistakes.

While the shaft is out I'm going to order new bearings for the re-installation.

The hub will be machined using an alloy of 4140, same stuff used to make twist drill and axles, our new hub will be better that the original.

While I'm on the topic of transmissions, what did the Allis and Simplicity use for hydraulic oil.
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rustydollar View Drop Down
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Points: 456 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rustydollar Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug 2017 at 8:05pm
To remove the rear pto shaft from the transmission, remove the top cover, pick the front seal out then remove the internal snap ring.

Bring the shaft forward then remove the bearing, with the bearing removed you can now withdraw the pto shaft.

The rear bearing is needle bearings, I'm not replacing the rear bearing only the front one along with a new seal.







Edited by rustydollar - 31 Aug 2017 at 8:08pm
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Anyone considering to replace the rear hub that hold the electric clutch to the pto shaft leading into the transmission.

Should remove the pto shaft for a visual inspection, after removing the shaft found that the splines are also badly worn.

The worn splines I'm hoping can be tig welded over with new splines cut in. It's in the hands of our EDM fellow with more knowledge in this type of repair.

This is the type of worn out junk you'll get from eBay.

Combine that wear with that of the hub and you have some serious wear.
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Points: 1819 		Post Options Post Options   Thanks (0) Thanks(0)   Quote coggonobrien Quote  Post ReplyReply Direct Link To This Post Posted: 01 Sep 2017 at 5:01am
nice
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aras View Drop Down
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Very nice!  I love this fix! 

They use ATF for hydraulic fluid
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Points: 477 		Post Options Post Options   Thanks (0) Thanks(0)   Quote talntedmrgreen Quote  Post ReplyReply Direct Link To This Post Posted: 01 Sep 2017 at 11:56am
great thread, thanks!  can't wait to see the rest.
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Originally posted by talntedmrgreen talntedmrgreen wrote:

great thread, thanks!  can't wait to see the rest.


Definitely not an overnight fix and not for the feint of heart with shallow pocket books.

The shaft will have to be machined from new stock, the gear is welded onto the shaft the weld will be machined away saving the gear for the new shaft.

The shaft splines cut in on a milling machine using an indexing head, once completed the gear will be welded onto the shaft.

As for the hub the main profile shaped on a cnc lathe, then shipped over to another company that does the EDM to cut in the internal spline.

Some of the quotes I've received are outrageous, I'm still shopping for a decent price and I'm running out of shops.

With the economy going the way it is wouldn't surprise me that well be forced to call on 1-900 numbers billed per minute asking for a quote. 


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Originally posted by aras aras wrote:

Very nice!  I love this fix! 

They use ATF for hydraulic fluid


Thanks, just wanted to confirm.
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The pto shaft uses a weld on gear, the weld will be machine off then the gear pressed off then re-welded onto the new shaft.

Splines on the new shaft are milled in on a milling machine using an indexing head.

Once the hub has been machined the spines are cut in with EDM.

Total cost for both parts came in well under a grand.
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