Overrunning clutch on a C
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=56432
Printed Date: 16 Dec 2025 at 5:24am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Overrunning clutch on a C
Posted By: MilesGray (CO/KS)
Subject: Overrunning clutch on a C
Date Posted: 06 Sep 2012 at 2:31am
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Recently, I changed out my PTO shaft on my C. I used an extra one I had off a 1938 B to replace it. I was using the brush hog last weekend and the clutch would come off of the shaft after a certain amount of time. Until I changed the shaft, I never had this problem, ( and I never greased the fitting for the clutch). My brush hog needs the overrunnning clutch because the size coming out of the tractor and the size of the shaft for the brush hog are different. I was wondering if the size of the PTO shaft on a B is slightly smaller than the C or if just by greasing the part, I caused my own problem? The overrunning clutch has seized because it ran through the mower after it came off, so i am working it 'old school', popping it out of gear when I need to stop. Luckily, I don't have many times when I might go through fences or into a ditch! ------------- Miles Gray (CO/KS) 5 1938 B's, 1940 B, 1944 WF C, 1948 NF C, Gleaner A, White Top Rotobaler, 1957 IH Golden Jubilee... I'm either a collector, or crazy! |
Replies:
Posted By: Orange Blood
Date Posted: 06 Sep 2012 at 3:43am
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It's possible the "B" shaft was used more, and is slightly more worn, but If I understand you correctly, the overun clutch is sliding off the Tractor PTO shaft?? Even if the shaft is slightly worn, is this a 3rd party clutch, shouldn't it have the locking balls, or roll pin, inside which is only released by the locking collar on the outside?? Slight wear should not cause the clutch to fall off. And yes I grease all of my PTO shafts, this should not be a problem. ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: MilesGray (CO/KS)
Date Posted: 06 Sep 2012 at 6:57am
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The only locking collar I have is on the brush hog side. I now have two metal pieces attached to the PTO cover on the tractor that prevents the clutch from coming off the shaft while I am mowing. I was wondering if there is a spriong that goes in the square driveline on the mower that might have kept it attached and is now bad an in need of replacement? I have to say that I didn't look at that while i was there, just wanted to finish my 11 hours of mowing over two days! This is the second time it has all been mowed since Memorial Day. ------------- Miles Gray (CO/KS) 5 1938 B's, 1940 B, 1944 WF C, 1948 NF C, Gleaner A, White Top Rotobaler, 1957 IH Golden Jubilee... I'm either a collector, or crazy! |
Posted By: Nathan (SD)
Date Posted: 06 Sep 2012 at 8:56am
| The one I have has a roll pin to go through the small hole on the tractor shaft to keep it on. |
Posted By: Murph-NC
Date Posted: 06 Sep 2012 at 11:26am
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Same thing here... roll pin goes through clutch and hole in PTO shaft. Make sure the pin is centered and only long enough to engage the inner portion of the clutch. If the pin is too long it won't let the outer portion of the clutch 'freewheel' when you need it to. ------------- '41 C w/Woods L503 mower, #3 mower, 2-way plows for C |
Posted By: CTuckerNWIL
Date Posted: 06 Sep 2012 at 11:51am
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Your over running clutch is missing something and is NOT safe to use this way. Either it should have a spring loaded push button you have to push in to put on or remove like this: http://www.yerikindia.com/products/5-Three-Point-Linkage-Parts-and-Tractor-Accessories/5-77-Splined-PTO-Coupling-enlarge.jpg" rel="nofollow - http://www.yerikindia.com/products/5-Three-Point-Linkage-Parts-and-Tractor-Accessories/5-77-Splined-PTO-Coupling-enlarge.jpg Or it should have a pin like this that goes thru the clutch and the tractor PTO shaft to keep it in place. http://c.shld.net/rpx/i/s/pi/mp/3670/161944844p?src=http%3A%2F%2Fmedia.mydoitbest.com%2FImageRequest.aspx%3Fsku%3D744877%26size%3D2%26NewSize%3D300%26Warehouse%3Dc&d=246c111fbf2eb278140639412c2153fcc5a8ad2d" rel="nofollow - http://c.shld.net/rpx/i/s/pi/mp/3670/161944844p?src=http%3A%2F%2Fmedia.mydoitbest.com%2FImageRequest.aspx%3Fsku%3D744877%26size%3D2%26NewSize%3D300%26Warehouse%3Dc&d=246c111fbf2eb278140639412c2153fcc5a8ad2d ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: MilesGray (CO/KS)
Date Posted: 07 Sep 2012 at 7:53am
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Charlie - The brush hog has the spring loaded push button, the clutch has a zerk on one side of the clutch and just a hole on the other. there is no way to put the pin from the second picture in the clutch. The clutch is siezed and at this point, I am only using it as an adapter to run the brush hog. The shaft size on the mower is bigger than the shaft on the tractor. ------------- Miles Gray (CO/KS) 5 1938 B's, 1940 B, 1944 WF C, 1948 NF C, Gleaner A, White Top Rotobaler, 1957 IH Golden Jubilee... I'm either a collector, or crazy! |
Posted By: David Gibson (OH)
Date Posted: 07 Sep 2012 at 7:58am
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Mine has a roll pin also. Sounds like you need a new overrunning clutch. ------------- David Gibson http://www.darkecountysteam.com" rel="nofollow - http://www.darkecountysteam.com 1956 WD45 |
Posted By: Dick L
Date Posted: 07 Sep 2012 at 8:42am
Or drill a hole thru the clutch and shaft, if one is not there and put a roll pin in. I have seen several over the years with a bolt with a lock nut to hold it in place rather than a roll pin.
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David Gibson (OH) wrote:Posted By: David Gibson (OH)
Date Posted: 07 Sep 2012 at 8:45am
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The roll pin has to be shorter than the outer sleeve so it can spin free. A bolt through both would defeat the purpose of the clutch. ------------- David Gibson http://www.darkecountysteam.com" rel="nofollow - http://www.darkecountysteam.com 1956 WD45 |
Posted By: Dick L
Date Posted: 07 Sep 2012 at 8:53am
Ok, I was thinking about the adaptor that increases the spline diameter for the clutch.
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Posted By: MilesGray (CO/KS)
Date Posted: 07 Sep 2012 at 2:10pm
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I talked to the previous owner and he said that the roll pin is under the zerk, so when I get back I will remove it and replace the roll pin, making sure it is placed below the sleeve. ------------- Miles Gray (CO/KS) 5 1938 B's, 1940 B, 1944 WF C, 1948 NF C, Gleaner A, White Top Rotobaler, 1957 IH Golden Jubilee... I'm either a collector, or crazy! |
Posted By: David Gibson (OH)
Date Posted: 07 Sep 2012 at 2:48pm
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Mine has a grease zerk on each side. ------------- David Gibson http://www.darkecountysteam.com" rel="nofollow - http://www.darkecountysteam.com 1956 WD45 |