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Clutch problem
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Freewheeling View Drop Down
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Joined: 05 Nov 2017
Location: Wisconsin
Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Freewheeling Quote  Post ReplyReply Direct Link To This Post Posted: 30 Sep 2024 at 6:17pm
I used a metal alignment tool when installing the disk and pressure plate and there was no binding.  I'll try the plastic tool that Kentucky clutch sent and see how it fits.  
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Freewheeling View Drop Down
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Freewheeling Quote  Post ReplyReply Direct Link To This Post Posted: 30 Sep 2024 at 6:36pm
I agree.  The only thing I didn't replace was the flywheel.What is the spec for the flywheel? I couldn't fund it.  I posted that the new ring gear extends .065" from the flywheel but didn't get any feedback.  If it's the original I'm sure it's been resurfaced multiple times over it's 72 years.    I looked for a new flywheel but all I came up with on the internet was used. I haven't checked with Agco.
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Freewheeling Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 2024 at 6:57pm
I split the tractor again and disassembled everything, flywheel included.  First, new flywheels are not available anywhere includng Agco.   Second the bushing doesn't appear to be deformed at all and a .868' alignment tool fits and turns without binding.  I also slid the flywhel on the input shaft and it turns freely.  However, since the flywheel is off I'm going to have it reemed to .879" as per the service manual.  

Does anyone know the diameter of the input shaft end that fits in the bushing? Hard to measure but mine appears to be .873".  Also I would appreciate the minimum flywheel thickness.   Mine is: Face to crank mount 1.418"; Face to step flange 1.596"-1.616" ; Face to the back side rough casting 1.227"-1.230.

The throwout bearing moves approx. 1" so with 1/4" gap the fingers should compress 3/4" which would seem to be sufficient. Whadda-ya-tink?

I have an auxiliary engine off a combine that I could pull the flywheel from but only as a last resort. 
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Les Kerf View Drop Down
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Joined: 08 May 2020
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Points: 842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 03 Oct 2024 at 8:14am
Originally posted by Freewheeling Freewheeling wrote:

...
The throwout bearing moves approx. 1" so with 1/4" gap the fingers should compress 3/4" which would seem to be sufficient. Whadda-ya-tink?...

Since I have only had a Model C apart three times Iam just guessing, but it seems to me that it should be adequate. For testing purposes even one thousand (0.001") is enough.

I still suspect that oilite bushing is a bit tight and needs some grease.
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Freewheeling View Drop Down
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Freewheeling Quote  Post ReplyReply Direct Link To This Post Posted: 03 Oct 2024 at 4:30pm
I measured the bushing again with a caliper and with a telescoping gage and found it is.874” - .875” and within spec  per replacement bushings. Nevertheless, I ran a   hone in the bushing and finished it with 600 grit wet-and-dry. 

I measured the input shaft again as best I could and got .871" -.873". I have not been able to find a spec for the shaft end.  So there is .004"_ .001" clearance between the bushing and the shaft.c for the shaft end.  I'm wondering if that's too tight. Yesterdays Tractors has a bushing with a .883 ID for B, C, IB. They couldn't confirm that it was the correct size and told me they have multiple souces for the bushing and that some are .875" ID.  I'm checking with AGCO.

The throwout bearing moves forward 1” with the clutch rod having 1/4" free travel.  With a 1/4” gap until it  engages the fingers, that means the bearing can move the fingers ¾”. Per Kentucky Clutch, the fingers only have to move half of that or 3/8”.
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Les Kerf View Drop Down
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Joined: 08 May 2020
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Points: 842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 03 Oct 2024 at 6:30pm
Originally posted by Freewheeling Freewheeling wrote:

I measured the bushing again with a caliper and with a telescoping gage and found it is.874” - .875” and within spec  per replacement bushings. Nevertheless, I ran a   hone in the bushing and finished it with 600 grit wet-and-dry. 

I measured the input shaft again as best I could and got .871" -.873". I have not been able to find a spec for the shaft end.  So there is .004"_ .001" clearance between the bushing and the shaft.c for the shaft end.  I'm wondering if that's too tight. Yesterdays Tractors has a bushing with a .883 ID for B, C, IB. They couldn't confirm that it was the correct size and told me they have multiple souces for the bushing and that some are .875" ID.  I'm checking with AGCO.

The throwout bearing moves forward 1” with the clutch rod having 1/4" free travel.  With a 1/4” gap until it  engages the fingers, that means the bearing can move the fingers ¾”. Per Kentucky Clutch, the fingers only have to move half of that or 3/8”.

0.010" clearance is not too much, I would prefer to not have more than 0.020" though.
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Freewheeling View Drop Down
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Joined: 05 Nov 2017
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Freewheeling Quote  Post ReplyReply Direct Link To This Post Posted: 04 Oct 2024 at 7:05am
Note that it's not .010 but rather .001.  Like I said it's difficult to measure the shaft but but I'm pretty confident in my findings.   There are some minor scratches on the shaft but I've smoothed it with 600 grit and don't believe they would cause binding. 
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