AC 6080 PTO lever not staying engaged
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=191150
Printed Date: 02 May 2025 at 1:10pm
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Topic: AC 6080 PTO lever not staying engaged
Posted By: ssefick
Subject: AC 6080 PTO lever not staying engaged
Date Posted: 09 Oct 2022 at 3:29pm
Hello,
Just got the PTO in service on the 6080.
1. I am engaging at idle with the clutch and pto clutch engaged. There is some grinding. Is this ok?
2. The PTO coupler is disengaging by itself. Is there a part that might be missing? A magnet or something?
Thanks! This is a great tractor!
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Replies:
Posted By: DrAllis
Date Posted: 09 Oct 2022 at 7:09pm
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I wonder if you aren't pulling up far enough and getting it 100% engaged ?? Been a long time but I think the knob needs to come up at least 3 inches if not more and there is a detent that clicks to hold it up.
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Posted By: Mikez
Date Posted: 09 Oct 2022 at 7:23pm
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Are you referring to the knob next to the left side of seat. Do you have an operators manual. It’s tricky wording. Believe that’s called a seasonal disconnect and is supposed to be pulled up engaged with engine off. What I usually do if starting a cold or first time that day. I start with the left knob down disconnected and right hand clutch forward. Start drive to wherever I’m going needing pto, shut off engine and pull left knob up engaged and right hand clutch back disengaged. Start engine and operate pto with right hand clutch.
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Posted By: Mikez
Date Posted: 09 Oct 2022 at 7:26pm
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But that’s not helping with the lever staying up though
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Posted By: DSeries4
Date Posted: 09 Oct 2022 at 7:48pm
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The PTO is engaged with the tall lever on the right side - there is no grinding associated with that lever. If you are getting grinding, you are using the disconnect on the left side to control the PTO and that is wrong. The disconnect is only supposed to be moved when the engine is shut off to avoid grinding.
If you don't have an operator's manual, I recommend that you get one.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Posted By: ssefick
Date Posted: 09 Oct 2022 at 8:06pm
I have an operators manual. There are 2 ways that are specified in that manual. 1 with engine off and 1 with engine on. I will only refer to what I understood from the engine on option.
At 1000rpm I push the main transmission clutch in, pull the PTO clutch back, and engage the seasonal disconnect.The seasonal disconnect is pulled up as far as I can pull it. There is some grinding when engaging the coupler when pulling up the seasonal disconnect. Then I slowly release the PTO clutch, and relese the main clutch to start forward motion.
The coupler comes off the PTO shaft and pto disengages (I have been inside the compartment before to reinstall the coupler paddle). I repeat the above procedure to re-engage. In 2 hours of mowing the PTO stopped operating around 4 times.
Is there a magnet or something that holds up the lever that engages the coupler?
Any help is greatly appreciated. Anything I am doing incorrectly, I will happily correct.
Thanks!
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Posted By: AC720Man
Date Posted: 09 Oct 2022 at 10:04pm
Ok, I’m kinda confused. There is only 2 ways to properly engage the pto. Let’s start with the engine running. Pull the throttle all the way back....around 750 rpm, main foot clutch in. Pull temporary disconnect lever back until it clicks. Yellow light comes on in the dash. Pull the pto lever up on the left side of the floorboard. Keep a constant pull up on the lever. Yes it will grind but it will engage. Slowly release the temporary disconnect lever on the right side of the console control and the pto should engage. NEVER EVER not pull the temporary disconnect lever back before engaging the pto. This is a 2 stage process.
The easier and less damaging way of engaging the pto is to bring tractor to idle. Shut off the engine, pull the disconnect lever back until it clicks. Pull the pto lever up, start the engine, yellow light will be on, slowly release the temporary disconnect lever to engage the pto. No grinding, and my preferred way of operation. Our 6060 was purchased new in 1981 and has never had pto issues engaging the pto either way but we prefer the engine off engagement. As far as the coupling coming off, that usually only happens when you split the tractor to replace clutches and don’t follow the directions in the service manual. Something must be damaged for that to occur.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: ssefick
Date Posted: 10 Oct 2022 at 6:34am
AC720MAN,
The method you describe with the engine on is what I am doing. I'll make sure the throttle is all the way down.
Unfortunately, I am figuring out what has been done by a man that is now dead. It looks like he did a complete rebuild, but might not have completed everything.
Regardless, I am looking for a fix for my problem of PTO disconnect. Any ideas? If not I'll figure it out.
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Posted By: MACK
Date Posted: 10 Oct 2022 at 7:55am
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If long lever on right is properly adjusted, you can pull it back and and engage left linkage without any grinding. Foot clutch should not have any thing to do with PTO. MACK
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Posted By: ssefick
Date Posted: 10 Oct 2022 at 8:01am
Sounds like I need to adjust the PTO clutch.
Is the mechanism that keeps the coupler coupled magnetic, or something else?
Thanks everyone!
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Posted By: DrAllis
Date Posted: 10 Oct 2022 at 9:08am
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The UP/DOWN disconnect lever has a DETENT (click) on the top and bottom of the stroke. The grinding into gear has nothing to do with the lever falling down out of engagement. I've told you what I thought.....you're not getting the lever pulled 100% of the way UP.
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Posted By: Mikez
Date Posted: 10 Oct 2022 at 9:12am
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Try with engine off pull up all the way
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Posted By: AC720Man
Date Posted: 10 Oct 2022 at 8:38pm
Mack, I said to push the clutch in to make sure the tractor is stopped. I should have explained that better. Clutch will need to be pushed in, in the engine off procedure in order to to restart the tractor due to the clutch safety switch.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: ssefick
Date Posted: 16 Oct 2022 at 7:46pm
Adjusted PTO clutch to spec. in manual. There is still some grinding when engaging. Any ideas? The PTO does not spin until released, but just grinds when engaging.
Thanks. I guess I'll use the engine off method for now (but looks like the ingnition switch is having a problem). Good thing is I'll know this machine backwards and forwards once I get it working good.
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Posted By: Mikez
Date Posted: 16 Oct 2022 at 8:14pm
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There’s safety switches on those levers. They should be fixed correctly but if you jump the wires on safety switch to see if it’s that or not.
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Posted By: AC720Man
Date Posted: 16 Oct 2022 at 8:43pm
The pto can be engaged with the engine at low idle. It will grind briefly, just keep constant pressure as you pull up on it. Our 6060 has done this since new. Dealer had 2 6060’s and a 6080 on their lot and each one did the same thing. Dealer verified with Allis that this was normal. Keep in mind, they were the earlier models, 1981. Maybe improvements were made over the years.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: ssefick
Date Posted: 16 Oct 2022 at 8:52pm
Ac720man. Gotcha, this one is an 83 I think. Good to know. It does engage after brief grinding.
Mikez the safety switches are completely destroyed. That clutch is all mechanical right? Would fixing those fix the grinding?
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Posted By: ssefick
Date Posted: 16 Oct 2022 at 8:55pm
Oh I gotcha mikez. I just found these broken today, but I suspect they have been broken for a while, and the tractor has been starting until a couple of weeks ago.
Maybe those things are the problem...
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Posted By: ssefick
Date Posted: 20 Oct 2022 at 6:44pm
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It doesn't seem the detent is catching. Any thoughts. My redneck solution is to use a pair of vice grips on the seasonal disconnect next to the driver's seat.
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