Grinding Clutch on 48

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cecildew
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Joined: Tue Nov 04, 2014 2:35 pm
Zip Code: 21921
Tractors Owned: 1948 Farmall Cub
Location: MD, Fair Hill

Grinding Clutch on 48

Postby cecildew » Sun Aug 25, 2019 7:58 pm

I have a 1948 Cub with a grinding clutch. The pedal is fully depressed, but when I try to shift into gear it grinds. I thought I might be able to adjust the pedal as it does seem to go down about 2" before engaging and I know that it should only go 1" before engaging. However I can't figure out how to do that. Any ideas?
1948 Farmall Cub
- McCormick Cub-22 Mower
- McCormick Cub-193 Moldboard Plow
- McCormick Cub-54 Leveling & Grader Blade

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MiCarl
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Zip Code: 48154
Tractors Owned: 1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631
Circle of Safety: Y
Location: Livonia, MI

Re: Grinding Clutch on 48

Postby MiCarl » Sun Aug 25, 2019 8:06 pm

On the '48 you adjust the clutch by turning a clevis at the throw out bearing. That round cover under the clutch gives you access.

I have a '48 and it will also grind going from neutral into gear. But shifting between gears there is no problem. I think there is just enough drag at the clutch and pilot bearing to keep the input shaft spinning when it is in neutral. I throttle down and shift quickly into reverse on the theory I'd rather put the wear on the reverse gear than a gear that gets worked under load.
1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631

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Glen
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Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
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Location: Wa.

Re: Grinding Clutch on 48

Postby Glen » Sun Aug 25, 2019 8:47 pm

Hi,
IH changed the method of adjusting the clutch pedal free play about half way through 1948, at Cub serial number 32229, so you could have either style of adjustment.
You can look at the serial number and see what it is.

Below is a page from the 1947 Cub owner's manual, showing how to adjust the clutch pedal free play for the 1st style of adjustment.

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

Below is a page from the 1949 Cub owner's manual, showing how to adjust the free play for the 2nd style adjustment.

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

It's also possible that the 3 pressure plate fingers are too low, and need raising up to the correct measurement. It is common that they are low.
The throwout bearing and it's holder can only move a certain distance ahead before they hit the turning pressure plate. If the fingers are adjusted too low, the clutch won't fully release before the bearing hits the pressure plate.

Try adjusting the free play first, and see if it works. :)

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cecildew
5+ Years
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Posts: 21
Joined: Tue Nov 04, 2014 2:35 pm
Zip Code: 21921
Tractors Owned: 1948 Farmall Cub
Location: MD, Fair Hill

Re: Grinding Clutch on 48

Postby cecildew » Mon Aug 26, 2019 8:34 pm

Thanks. It is Serial #19999, so the 47 book should do the trick.
1948 Farmall Cub
- McCormick Cub-22 Mower
- McCormick Cub-193 Moldboard Plow
- McCormick Cub-54 Leveling & Grader Blade

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Glen
10+ Years
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Posts: 5512
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Grinding Clutch on 48

Postby Glen » Mon Aug 26, 2019 9:48 pm

Hi,
Since it is the 1st style of free play adjustment, you could also check the pressure plate finger height, while you are working up through the hand hole. They have to be the right height so the clutch will release.
Some of the people on here have said to use about 1 1/8" high, for Cubs with the 1st style free play adjustment.
It might work with the 1 1/4" height also. You can tell as you try using the clutch. :)

Below is a post showing how to adjust the finger height. You have to make the tool shown in the post.

viewtopic.php?f=141&t=66543

Below is a pic showing where to measure. The pressure plate has to be assembled on the flywheel, not off, like in the pic. The finger height changes as the pressure plate is put on the flywheel.
Attachments
Cub clutch 3.jpg

inairam
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Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
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1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
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1979 long strip 12 v stuck engine
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1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
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Location: Glen Mills PA

Re: Grinding Clutch on 48

Postby inairam » Tue Aug 27, 2019 6:15 am

On a 48 I would go with the 1 1/4 adjustment. I used the 1 1/8 and have to go back in had to redo it. That is even with the after sn 32229 clutch pedal arrangement with external adjustment.
When you only have 9 horsepower you need to know the names of all of the ponies!

ajhbike
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Re: Grinding Clutch on 48

Postby ajhbike » Tue Aug 27, 2019 6:25 am

I had the same issue and brought my loboy to Cecil's to split and fix. TST Tim noticed the bolt on the throwout bearing had disappeared. Replaced it and it fixed the problem. Check it out


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