200 2 speed pto stopped turning
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=105321
Printed Date: 10 Sep 2025 at 8:22am
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Topic: 200 2 speed pto stopped turning
Posted By: Amos
Subject: 200 2 speed pto stopped turning
Date Posted: 26 Apr 2015 at 5:53pm
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I was cutting cornstalks with the 200 this afternoon and the pto just stopped turning. I have checked the pressure on the pto valve and have 295 psi whether the clutch is engaged or disengaged and makes very little (maybe 3 psi) difference if the engine is at full throttle or idle. I have looked in my service manual and it appears as though there is a long shaft going through the torque tube from the pto clutch to the 2 speed drive assembly with couplers at both ends of this shaft. Is it possible that one of those couplers has worn out or the splines on the end of the shaft worn off? I rebuilt the pto clutch and the power director about 3000hrs ago when I bought the tractor and the pto clutch had all new discs put in at that time. I can't imagine that it is the problem. Should I remove the pto housing off the back of the rear end first or is there a place I can see the pto shaft couplings without taking this all off? I would appreciate an experienced opinion where to tear into this first as I need the tractor working in the next few days at the outside.
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Replies:
Posted By: Lynn Marshall
Date Posted: 26 Apr 2015 at 7:55pm
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I believe that some of the 200s had a lever between the battery box and the torque tube that would be used to shift a coupler if the tractor was a mechanical engaged PTO. If this tractor has this, it's possible that it has moved and disengaged the shaft.
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Posted By: Amos
Date Posted: 26 Apr 2015 at 8:19pm
Problem turned out to be the coupler behind the pto clutch. I was able to access it by taking off the power director valve and the plates behind it and then sliding it rearward to engage the long shaft going back to the 2 speed gearing. It seemed to snap into place at the correct spot and was harder to move from centered on the two shaft than it was to slide it rearward to where it was supposed to be...word of advise to those who attempt this repair, do not have your little finger in the spline grove feeling the coupler while prying it into place, unless you want your finger pinched there till you can get the bar around to slide the coupler back off it, in a tiny space...
The big question we are trying to figure out is why did the coupler slide forward after all these year?
Thanks Lynn, this one is all hydraulic, I have seen 200's like you are referring.
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Posted By: tbran
Date Posted: 26 Apr 2015 at 8:57pm
think it was supposed to have a snap ring to prevent that, The coupler was the same on early clutch and non clutch units. Later the coupler was changed to a different coupler..
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: MACK
Date Posted: 26 Apr 2015 at 9:38pm
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It could have got slid forway part way when you rebuilt PD and over time slid the rest of the way off. MACK
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