This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Allis Chalmers > Garden Tractors
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


AC 720 / Simplicity 9020 Rear PTO Hub
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
rustydollar View Drop Down
Orange Level
Orange Level


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.
Back to Top
Sponsored Links


Back to Top
rustydollar View Drop Down
Orange Level
Orange Level


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 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
Back to Top
rustydollar View Drop Down
Orange Level
Orange Level


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 Posted: 31 Aug 2017 at 10:04pm
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.
Back to Top
coggonobrien View Drop Down
Orange Level Access
Orange Level Access


Joined: 14 Nov 2010
Location: Eastern Iowa
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
Back to Top
aras View Drop Down
Orange Level
Orange Level


Joined: 28 Jul 2011
Location: Weston, WI
Points: 665 		Post Options Post Options   Thanks (0) Thanks(0)   Quote aras Quote  Post ReplyReply Direct Link To This Post Posted: 01 Sep 2017 at 7:11am
Very nice!  I love this fix! 

They use ATF for hydraulic fluid
Back to Top
talntedmrgreen View Drop Down
Silver Level
Silver Level
Avatar

Joined: 25 Jun 2013
Location: Caledonia, MI
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.
Patterson B1*B1/B1Forklift*B10*BigTen/B1Loader*B110*B208*B206*616*Homelite T16H/T8/T7/RM7E*Landlord/Loader/Trencher*Broadmoor717*Serf525*2110*7790*Legacy XL*Twin 20*Squire9*Squire6*JCPenny 494
Back to Top
rustydollar View Drop Down
Orange Level
Orange Level


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 Posted: 01 Sep 2017 at 12:36pm
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. 


Back to Top
rustydollar View Drop Down
Orange Level
Orange Level


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 Posted: 01 Sep 2017 at 12:37pm
Originally posted by aras aras wrote:

Very nice!  I love this fix! 

They use ATF for hydraulic fluid


Thanks, just wanted to confirm.
Back to Top
rustydollar View Drop Down
Orange Level
Orange Level


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 Posted: 07 Sep 2017 at 8:40pm
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.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.152 seconds.


Help Support the
Unofficial Allis Forum