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Clutch Installation

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jasondepinto
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Clutch Installation

Postby jasondepinto » Sat Nov 16, 2019 8:24 am

Getting ready to bolt up the flywheel, clutch and pressure plate. In the clutch section of the service manual, it says to index the clutch to the flywheel before removal. What is this referring to? Is this a way of aligning the clutch properly, the same as using a clutch alignment tool? Also, I've cleaned up the face of the pressure plate, and flywheel with a wire wheel. The surfaces are smooth, clean metal now, but should they have some kind of "tooth" to them? Should I hit the friction surfaces with a roloc type scotch disc?
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Gary Dotson
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Re: Clutch Installation

Postby Gary Dotson » Sat Nov 16, 2019 8:53 am

They are referring to marking the relationship of the pressure plate to the flywheel (paint mark, punch marks or whatever). I don't know of anyone who does that, if you replace the clutch, it's a mute point.
As to the friction surfaces, I use a hand sanding block with 80 grit sand paper to prepare the surface.

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jasondepinto
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Re: Clutch Installation

Postby jasondepinto » Sun Nov 17, 2019 8:43 am

Part 2 of my clutch questions. The fingers on the pressure plate were quite further in than the recommended 1 1/4". There is a Steiner video about clutch repair on Youtube, and the young lady says the measurement should be 7/8". This is about where my fingers were, maybe even less. What is with the different measurements? Does the adjustment on these fingers change as the clutch disc wears? 1 1/4" seems quite far out. There were barely any threads for the jam nuts to grab. Next, I have to figure out clutch pedal adjustment, and how to achieve that 1/8' clearance from the throwout to the fingers. Any good write ups, or videos out there?
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tmays
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Re: Clutch Installation

Postby tmays » Sun Nov 17, 2019 9:36 am

At 1 1/4”, there should be room for a full nut to go on and that’s about it. Are you measuring to the right place? On the 7/8” steiner deal, there was a discussion on here quite awhile back. But I don’t think we solved the mystery. I did call steiner and they insist their measurement is correct. I posed the question here whether steiner bearing is different from IH bearing but I don’t know if the two have been compared
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Re: Clutch Installation

Postby Winfield Dave » Sun Nov 17, 2019 9:46 am

Here is the correct locations for measuring. 1-1/4" is correct if I remember.

clutch finger adjust measurement.jpg
Dave
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jasondepinto
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Re: Clutch Installation

Postby jasondepinto » Sun Nov 17, 2019 10:07 am

Definitely measuring from the right place, and currently at 1 1/4" from the plate to top surface of the finger. I'm just surprised how much I had to back the finger out (screw the adjusting screw in) to get that measurement. Mind you, I have no idea of how the clutch was functioning, as I've yet to hear my tractor run, or see it move. However, I'm just concerned because in the picture above, as well as one on the clutch finger post in the how to section (posted here), there are a lot of threads showing on the adjusting screw. I am using the pressure plate that was in the tractor. It looked to be in pretty good shape, just gave it the wire brush and prepped the friction surface. Using a new clutch disc though.
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jasondepinto
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Re: Clutch Installation

Postby jasondepinto » Sun Nov 17, 2019 10:08 am

Here are some shots of mine. You can see how the adjusting screw is actually below the surface of the jam nut.
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IMG_4330.jpg
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Re: Clutch Installation

Postby Eugene » Sun Nov 17, 2019 2:27 pm

I would tighten the jam nut down until all of the jam nut threads were engaged.

Run into this before. Had perhaps 1 3/16" height on the levers. Clutch worked fine.
I have an excuse. CRS.

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tmays
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Re: Clutch Installation

Postby tmays » Sun Nov 17, 2019 4:12 pm

Eugene wrote:I would tighten the jam nut down until all of the jam nut threads were engaged.

Run into this before. Had perhaps 1 3/16" height on the levers. Clutch worked fine.

Yep, more important that all the fingers are at same height
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Re: Clutch Installation

Postby Crimson Tim » Sun Nov 17, 2019 7:14 pm

I seem to recall a year or two ago, there was some discussion whether the forum as a whole should start recommending 1 1/8” instead of 1 1/4” for this reason. It sounded to me like momentum was building, then the discussion just sort of petered out without coming to any final conclusion that I know of.
So, yeah. Anywhere in that ballpark that works for your tractor should be good.

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Re: Clutch Installation

Postby bubbaearl » Sun Nov 17, 2019 8:09 pm

Crimson Tim wrote:I seem to recall a year or two ago, there was some discussion whether the forum as a whole should start recommending 1 1/8” instead of 1 1/4” for this reason. It sounded to me like momentum was building, then the discussion just sort of petered out without coming to any final conclusion that I know of.
So, yeah. Anywhere in that ballpark that works for your tractor should be good.

I read the same thing when I put mind in last summer and also looked at the video with the 7/8 inch so I made sure all were the same and set at 1 3/16 and worked just fine

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Re: Clutch Installation

Postby Jim Becker » Sun Nov 17, 2019 8:17 pm

Here are a couple threads that talk about 1-1/4 vs. 1-1/8. Seems to me the consensus is to stay with 1-1/4 if the adjusting bolts are long enough to do so. If not, reducing to as low as 1-1/8 can be done with minimal problems.

viewtopic.php?f=1&t=93797
viewtopic.php?f=1&t=96347

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Re: Clutch Installation

Postby Glen » Sun Nov 17, 2019 8:50 pm

Hi,
The distance between the throwout bearing and the pressure plate fingers is set by adjusting the clutch pedal free play to the right amount.
You didn't say what year Cub you have.

Serial numbers 32228 and below, with the internal adjustment, use 1 3/16" of free play, the Cub owner's manual shows.
Serial numbers 32229 and above, with the external adjustment, use 1" of free play, the Cub owner's manual shows.

Below is a page from the 1947 Cub owner's manual, showing the clutch.

http://farmallcub.com/rudi_cub/www.clea ... age-40.jpg

Below is a page from the 1950 Cub owner's manual.

http://farmallcub.com/rudi_cub/www.clea ... e%2040.jpg

People have said on here that if the adjusting screws for the fingers are too short, McMaster Carr or somewhere has longer screws. They have to be as short as they can be, so they don't hit the throwout bearing, or holder. :)

Gary Dotson
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49 Leader "D" (Princess)
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48 Leader "D" unrestored
Kubota B6200E
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Kubota B8200HST-D
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Location: OH West Mansfield

Re: Clutch Installation

Postby Gary Dotson » Mon Nov 18, 2019 8:28 am

I ground 1/8" off my gauge stick, a year or so ago and adjust them all to 1 1/8".

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jasondepinto
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Location: Whitehouse Station, NJ

Re: Clutch Installation

Postby jasondepinto » Thu Nov 21, 2019 8:49 am

Thank you all for the advice. I set the clutch fingers at 1 3/16, figuring it was right in the middle of the hotly debated 1 1/4 VS 1 1/8. I am much happier with the amount of threads the jam nut wee able to grab on the adjusting screw. We'll see how it works when I finally get the tractor up and running.

I also see there was a newer post than mine regarding someone having trouble with their clutch, and the pressure plate originally being set at 7/8. It's interesting there there is so much debate in this area. Everything else about these Cubs seems to be so cut and dry.
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