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Allis Chalmers Discussion Forum
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D17 clutch question

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Packer Backer

10-08-2007 06:38:09




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I have a D17 series 1 diesel which I have brought back from a very poor condition, including sitting for about 10 years with fuel in the system. Runs like a champ today, nice and clean and smooth...
Recently, my clutch pedal went dead, and would not allow a shift into gear. I suspected a throw-out bearing or fork problem, so I split the tractor. I found that the "shifter" as it is called out in the owner"s manual had slipped past the fork. This "shifter" is the knuckle that slides on the shaft, and is what actually is moved by the clutch fork to press the throwout bearing against the clutch fingers... This knuckle had rotated on the shaft, and allowed the fork to slip over it, making a clutch pressing useless. I found that the fork was easy to spread apart, so I shimmed it on the pivot end (with the rod in the casting). This did not work, as it rotated again after only a few shifts... I had also replaced the throw out bearing with a new one at the same time... The forks are worn on the front side, which act on the knuckle. It seems as though the spinning shaft is what is causing this knuckle to rotate off of the proper position on the fork. Does this knuckle have a bearing in it? I do not recall that it did, and it seemed to slide & rotate freely on the shaft... I am going to split it again, but hopefully for the last time. Any ideas? I may try to replace or flip the fork as well. Not much else in there, and nothing appears to hold this knuckle in place except the flats on it"s body being gripped by the fork arms. Thanks for any ideas!

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Packer Backer

10-09-2007 21:35:21




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 Re: D17 clutch question in reply to Packer Backer, 10-08-2007 06:38:09  
My owner"s manual agree"s with the dealer"s parts computer system - nothing holds the knuckle on the shaft or forks. If you can scan a page of what you are describing & email, I would really appreciate the help.



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Texas Denny

10-08-2007 09:24:15




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 Re: D17 clutch question in reply to Packer Backer, 10-08-2007 06:38:09  
I looked at the parts manual from Allis and my IT manual. Both show an excellent exploded view of the clutch assembly. The turning shaft is isolated from the clutch shifter by a retainer. I think you should get an IT manual so you can check your parts against those in the diagram. It sounds like the retainer is missing in your description.



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