Allis Chalmers 6080 PTO

Hey guys I was wondering if anyone could point me in the right direction , I have got an Allis Chalmers 6080 that the PTO lever on the right side doesn't disengage the PTO anymore , from looking at the tractor and reading up on it on some threads here , it seems that the tractor has always been ran using just the PTO lever on the right, which from what I am seeing is terrible for the tractor , I think this because the left pull up knob in the floor was siezed in the engage position , I got it free and working properly now , I can turn the tractor off and engage and disengage the PTO fine using left hand pull up knob and works as should , I took the cable off of the big lever on right side and moved linkage by hand and i can not get the PTO to disengage in any position I put the linkage in , would this be a clutch issue with being ran so many years by just using the lever and never really disengaging the PTO ? Thanks in advance.

Thanks for the reply , i will check the play in it , it does have the external bearing and say when you are bush hogging and you want to quit cutting for any reason you can't use the lever to the right , you have to shut down tractor and use pull handle to the left of the seat to disengage pto for it to not be turning wide open ,it has always spun with no load on it

Yes sir , that is what i am trying to get back working , it does nothing anymore , you thinking it could be that bearing play if i check and it has play in it?

Ok i will check , thank you for the help

Thank the Europeans for this type of PTO. Many Fiat tractors utilize this design and  6060-70-80's are a Fiat drive line. There are two clutches in the bell housing attached to the flywheel ( JD 3010-20/4010-20 similar but different). The "Traction" clutch is for the ground drive and connected to the foot clutch pedal. The "PTO" clutch is for just that, the PTO drive. Both clutches use a common pressure plate spring to engage them. It takes the foot pedal or hand lever (we call the "stage coach" handle) to release each clutch or "inch" with them. There are two sets of pressure plate fingers and two throw out bearings. Whenever you step on the clutch pedal OR pull back on the PTO clutch lever, you are forcing the crankshaft forward against the engines thrust bearing, that keeps the crank from moving forward or backwards. If you apply BOTH the pedal and PTO lever at the same time, you have doubled the pressure on the thrust bearing, which was the problem, especially in the 6080 as it has a larger diameter clutch. Anyway, you pull back on the stage coach handle, reach down to the left of the seat and pull up and grind/couple the PTO to the rear of the tractor. Then, you ease forward on the clutch handle to make the PTO work. Constant operation of the tractor with the stagecoach lever locked to the rear is the eventual death of the engine's thrust bearing. So, that's why there is a disconnect to the left of the seat. UP is engaged. DOWN is disengaged. Keep the PTO clutch handle forward as much as possible.

Good point. That PTO disc is a fiber material and could do that. The traction clutch are the metallic buttons.

How much effort does it take to pull the yellow ( I love the new term Stage Coach handle)  back.  I remember it should have just an inch or so of free play then is pretty darn hard to pull back the rest of the way til it locks. If there is little resistance - there may be no fingers left on the clutch for the PTO side if the bearing locked up.  Since AC never used a 2 stage clutch except the 160 6060 70 80 - the owners had a new experience with dealers who did a poor job of educating operators of the possible issues - of course there is the famous Deere 4020 PTO clutch set up....that was perfect...   

It’s a shame all dealers did not explain the proper usage of the pto. Our dealer went over how to use it well when dad bought it new. It’s usage is also in the owners manual. But I need to remember a lot of these tractors have had multiple owners possibly and the proper operation wasn’t passed on. For hay farmers like us it works great. Get to the end of a windrow and have a ways to get to the next windrow just pull back the stage coach handle to “temporarily” disconnect the pto. When you arrive at the windrow slowly engage the stage coach handle to power the baler again. It’s called a temporary disconnect for a reason, never intended to be left back as Dr Allis stated. We replaced both clutches a few years ago, as dad grew older he often left his foot on the clutch pedal which wore the driveline clutch. Even though the pto clutch was operating fine we had Rick rebuild them both while we had the tractor split. Unfortunately he retired from rebuilding clutches and just does brakes now. He did excellent work. PTO work is mainly what our 6060 does, early model without the front support, but since we operate it correctly no sign of issues with the front bearing. The front support has a grease fitting that many look over and fail to grease leading to bearing failure in the support which provides no support to the front bearing. Check the front support to see if the bearing is still in good shape and signs of recent grease. That will tell you if proper maintenance was at least done to it.
I would agree that a split and clutch replacement would be my guess also. The big concern for me also would be the condition of the engine front bearing. I walked away from a nice 6060 when I found the stage coach pulled back. Asked the owner about how he operated it and he said didn’t use the pto much and left it in the disconnect position(pulled back) because that’s what the sticker said. In his defense the sticker does say disconnect/engage if I remember correctly. He was second owner with no owners manual.

Edited by AC720Man - 9 hours 24 minutes ago at 7:23pm

Hopefully you have a good AGCO dealer near by that can help you with parts. There are a few on the site if you don’t have one close by. I regularly use the AGCO parts website, a little difficult to navigate until you get used to it. It has a complete parts list of each section of the tractor. You will have to have a factory service manual if you plan to repair the tractor yourself. It is not an easy project and the service manual is mandatory to get the job done correctly and adjusted properly. They are good tractors, some see the pto as a poor design, and in some ways it is. But as far as how it operates, it really works well for our hay operation. Use it correctly and normally you will not have issues. JMO