8070 Dual PTO Install

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   I'm finally getting around to doing the 540/1000 install in my 8070 I restored a year or so ago.  I was planning to do this during the restoration process, but time didn't allow for it.  The tractor having only 1000 RPM was really limiting it's usefulness in our operation.  There have been many times where it would have been handy to have the 540 PTO because all the other tractors were busy.  It'll mostly get used on NH 450 Crop Cutter round baler,  but also hay tedder, rake and small square baler in some instances I'm sure.
I sourced both the upper and lower shafts from an 8050 from Abilene Machine for around $1000 dollars shipped.  This included a new reversable shaft.  

All new bearings and seals were sourced from my local Agco dealer that was around $450.  I disassembled the lower shaft last evening, cleaned everything up and installed the new bearings inside the 540 hollow shaft as well as new seals in the bearing retainer.  The plan is to use the clutch assembly and things that are currently in the 8070.  hope to get it installed this weekend.  More pictures of that process to follow.  

Much thanks to forum user LB0442 for their post on doing this to their 7080.  If anyone has any advice or pitfalls to watch out for,  please do let me know!  

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PAFarmer Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 06 Oct 2020 Location: Pennsylvania Points: 114	Post Options Post Reply Quote PAFarmer Report Post Thanks(0) Quote Reply Topic: 8070 Dual PTO Install Posted: 02 Mar 2023 at 8:22am
	I'm finally getting around to doing the 540/1000 install in my 8070 I restored a year or so ago. I was planning to do this during the restoration process, but time didn't allow for it. The tractor having only 1000 RPM was really limiting it's usefulness in our operation. There have been many times where it would have been handy to have the 540 PTO because all the other tractors were busy. It'll mostly get used on NH 450 Crop Cutter round baler, but also hay tedder, rake and small square baler in some instances I'm sure. I sourced both the upper and lower shafts from an 8050 from Abilene Machine for around $1000 dollars shipped. This included a new reversable shaft. All new bearings and seals were sourced from my local Agco dealer that was around $450. I disassembled the lower shaft last evening, cleaned everything up and installed the new bearings inside the 540 hollow shaft as well as new seals in the bearing retainer. The plan is to use the clutch assembly and things that are currently in the 8070. hope to get it installed this weekend. More pictures of that process to follow. Much thanks to forum user LB0442 for their post on doing this to their 7080. If anyone has any advice or pitfalls to watch out for, please do let me know!

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8070nc Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 21 Mar 2019 Location: North Carolina Points: 534	Post Options Post Reply Quote 8070nc Report Post Thanks(0) Quote Reply Posted: 02 Mar 2023 at 8:42am
	Ive got one im getting ready to do. Ill be paying close attention
	1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor

SteveM C/IL Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8354	Post Options Post Reply Quote SteveM C/IL Report Post Thanks(1) Quote Reply Posted: 02 Mar 2023 at 11:32am
	All I can add is that plate beneath pto holds a gallon or so fluid if you need to remove it. Seems like 5 gallon when it lands on you....

PAFarmer Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 06 Oct 2020 Location: Pennsylvania Points: 114	Post Options Post Reply Quote PAFarmer Report Post Thanks(0) Quote Reply Posted: 02 Mar 2023 at 1:49pm
	Thanks for that! Not that I don't enjoy a good oil or antifreeze bath from time to time, but too much of a good thing can go bad.

bigal121892 Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 05 Jan 2010 Location: Nebraska Points: 805	Post Options Post Reply Quote bigal121892 Report Post Thanks(0) Quote Reply Posted: 02 Mar 2023 at 3:37pm
	I would recommend dropping the plate under the PTO the night before, and let it drip overnight.

CrestonM Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Sep 2014 Location: Oklahoma Points: 8410	Post Options Post Reply Quote CrestonM Report Post Thanks(0) Quote Reply Posted: 02 Mar 2023 at 6:32pm
	Would this process be similar for a 7080? What is the title of that thread? I need to do this to mine. Edited by CrestonM - 02 Mar 2023 at 6:46pm

PAFarmer Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 06 Oct 2020 Location: Pennsylvania Points: 114	Post Options Post Reply Quote PAFarmer Report Post Thanks(0) Quote Reply Posted: 03 Mar 2023 at 8:32am
	The process should be identical for the 7080. The name of the 7080 thread is "7080 dual PTO install" and you can find it in the knowledge base.

PAFarmer Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 06 Oct 2020 Location: Pennsylvania Points: 114	Post Options Post Reply Quote PAFarmer Report Post Thanks(0) Quote Reply Posted: 05 Mar 2023 at 7:59pm
	Project complete! All told it took my dad and I 3/4 of a day, not counting the time it took to drain the oil the evening before and the couple hours I spent before hand getting the donor parts ready for install. I would say, overall I have a 10 hour day in it. I didn't take many pictures, but I'll post what I did take. It would certainly be possible to do it all in one day, but draining the oil the night before as Big Al recommended is a big plus. Another thing I did was remove the rear bearing retainer from the tractor and pull the shaft out of the front bearing cup. There was some oil backed up behind it that would have been dripping on my head all day if I hadn't done that the night before as well. Overall, from the donor tractor I used the 4 gears and the output shaft components. I used the clutch assembly and shaft from the 8070. For the most part, just follow the factory service manual and things will go well. The biggest challenge was getting the 8070's 1000 RPM shaft out of the tractor. Getting the front bearing off proved to be a real fight. The manual shows using a split bearing puller, but all ours are too big to get up in the housing. I ended up getting the shaft down out of the housing enough to drive the bearing off with a hammer and punch. Not easy, but doable. Here are the donor parts I used cleaned up and ready to roll. Removing the drawbar is a must and if I had to do it over again, I would probably remove the drawbar yoke as well. It's not necessary to remove, but it would have just been one less thing in the way. There is a good one or two gallons of oil laying on top of the bottom access plate. I managed to get it all into a bucket by removing all the bolts accept the left outside three. I only backed them out about 1/4 inch and then put a bucket under the tractor. Then I just pushed the cover down and all the oil ran out the right hand side into the bucket. Once it was done dripping, I removed the remaining bolts and then the cover. It was stuck on there pretty good with gasket maker, so it didn't just want to fall off. One step that I disagree with the manual on is when installing the hollow 540 RPM shaft and gear, they tell you to install the hollow shaft until the retaining bolts can be started. Try as I might, there was just no way to get the gear into the housing from the bottom without hitting the clutch output gears above. We ended up taking the hollow shaft back out, I held the gear in place from the bottom while my dad put the shaft in place. After that, reassembly was easy. One thing you'll need is a 2 3/8" wrench to tighten the big nut that sets the preload on the output shaft assembly. It's not something most people have. I tried to use a massive 24" crescent wrench, but it didn't fit very well. I ended up taking an old junker 2" wrench I had and machining it out to 2 3/8". The manual says to measure the rolling torque on the 1000 RPM shaft to set preload. To do this, I put the reversable shaft on and then used a 1 5/16 inch socket. I laid a shop rag over the shaft and then jammed the socket on the rag. It worked really well. Overall, the rolling torque came out to be about 50 inch pounds on the 1000 shaft. Afterwards, I measured our 8010 and it was identical. It would have been assembled at the factory, so I'm pleased that it came out the same. I ran it on a small grain auger today for several hours to see if it stayed quiet and happy and so far so good!! All said and done, it wasn't a terribly difficult project. My dad and I are both pretty mechanically inclined, so that helps. Two people are a must. I'm not saying it can't be done with one person, but it would be a real challenge at points. Now, if the hay would just grow so I can put it thru it's paces!

AC7060IL Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 19 Aug 2012 Location: central IL Points: 3433	Post Options Post Reply Quote AC7060IL Report Post Thanks(0) Quote Reply Posted: 06 Mar 2023 at 8:00am
	Here’s the link to LB0442’s 7080 pto swap. https://www.allischalmers.com/forum/7080-dual-pto-install_topic113779.html

CrestonM Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Sep 2014 Location: Oklahoma Points: 8410	Post Options Post Reply Quote CrestonM Report Post Thanks(0) Quote Reply Posted: 06 Mar 2023 at 8:15am
	Thank you for posting the process and your findings!

PAFarmer Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 06 Oct 2020 Location: Pennsylvania Points: 114	Post Options Post Reply Quote PAFarmer Report Post Thanks(1) Quote Reply Posted: 07 Mar 2023 at 9:07am
	Glad to do it. Hopefully someone finds it useful.

Meanolallis Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 04 Sep 2013 Points: 132	Post Options Post Reply Quote Meanolallis Report Post Thanks(0) Quote Reply Posted: 11 Mar 2023 at 9:01am
	Does installing the 2 speed give you weaker components or more gears involved in the 1000 rpm drive? In other words, is the single speed better if you wanted to use high hp out of it for long durations (is there a downside to the 2 speed?) ? Thanks!

PAFarmer Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 06 Oct 2020 Location: Pennsylvania Points: 114	Post Options Post Reply Quote PAFarmer Report Post Thanks(0) Quote Reply Posted: 11 Mar 2023 at 10:08am
	The 1000 RPM gears in the 2 speed setup are a bit narrower than the factory 1000 single speed. I didn't measure, but I would guess somewhere in the .25 inch ballpark. So, in theory, will the factory setup transfer more power than the dual speed? Yes, I would assume so. With that said, I don't think the reduction in size is enough to really cause concern for any applications I use my 8070 for. The dual speed PTO gears are still very beefy compared to some PTO drivelines I've seen in similar sized modern tractors. The PTOs in these tractors seem to be built like tanks.

Mikez Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 16 Jan 2013 Location: Usa Points: 8483	Post Options Post Reply Quote Mikez Report Post Thanks(0) Quote Reply Posted: 11 Mar 2023 at 1:14pm
	Was there a reason for not putting in factory 540/1000. Would guess maybe cost savings. Tractors D-21,210,220,7080,8070 right

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 20982	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 11 Mar 2023 at 2:28pm
	The SAE engineers had a lot to do with how tractors were configured. There's a reason tractors over 165 PTO HP have that huge 1 3/4" PTO shaft...because SAE said so. I think the 540 PTO speed max HP got adjusted over the years and A-C kind of protected themselves by making their dual speed 540 shaft twist off if overloaded.

SteveM C/IL Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8354	Post Options Post Reply Quote SteveM C/IL Report Post Thanks(0) Quote Reply Posted: 12 Mar 2023 at 10:09pm
	Anecdotal story. Cousin has 7020 that has twisted 2 540/1000 setups running a 15ft batwing. He put the big 1000 in and hasn't had trouble since. Apparently there is a necked shaft to clear a gear and that's where it breaks.