Transmission shifting question

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rstoots
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Transmission shifting question

Postby rstoots » Sun Mar 19, 2017 9:13 pm

I just bought a 1947 Cub and PO said it could not shift gears after tractor was running. Said you had to put it in the gear you wanted and all was OK but was not able to change gears after tractor was started. He has replaced through out bearing, clutch disk, made lots of adjustments with no change. Hope you guys can direct me as to where to start?

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Re: Transmission shifting question

Postby bofahs » Sun Mar 19, 2017 9:24 pm

Yeah, that's the difference between a tractor and a car. On a tractor, you pick a gear and go. Don't like it? Stop. Pick another gear. Go.

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Barnyard
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Re: Transmission shifting question

Postby Barnyard » Sun Mar 19, 2017 9:30 pm

Are you saying you could not shift using the clutch, or that you had to turn the tractor off before changing gears and then start in gear?
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.
- Franklin D. Roosevelt -

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Eugene
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Re: Transmission shifting question

Postby Eugene » Sun Mar 19, 2017 9:33 pm

If I read the original post correctly, once the engine is running, you can not shift gears. Sticking pilot shaft bushing.
I have an excuse. CRS.

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Don McCombs
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Re: Transmission shifting question

Postby Don McCombs » Sun Mar 19, 2017 10:28 pm

Or perhaps clutch disk rusted to flywheel.
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rstoots
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Re: Transmission shifting question

Postby rstoots » Mon Mar 20, 2017 12:32 pm

Clutch disk is away from flywheel and I was told that you had to turn engine off to change gears. Turn engine off, depress clutch, start engine let clutch out and go.

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Re: Transmission shifting question

Postby Eugene » Mon Mar 20, 2017 1:05 pm

Sticking pilot bushing, located in center of flywheel.
I have an excuse. CRS.

rstoots
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Re: Transmission shifting question

Postby rstoots » Mon Mar 20, 2017 1:45 pm

Talked to PO and the pilot bushing was changed also.

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Re: Transmission shifting question

Postby Urbish » Mon Mar 20, 2017 2:18 pm

rstoots wrote:Talked to PO and the pilot bushing was changed also.


If that pilot bushing wasn't reamed after installation, it could be too tight on the transmission shaft and will keep it spinning. Also, if you have really thin oil in the transmission (or water), there will be less resistance to spinning within the transmission and will allow the transmission shaft to keep spinning even though the clutch is pushed in.

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Bill Hudson
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Re: Transmission shifting question

Postby Bill Hudson » Mon Mar 20, 2017 2:22 pm

Depending on how the pilot bushing was installed, there have been cases where the ID was changed enough to cause the shaft to drag. After reaming the bushing to the proper ID, problem solved.

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Don McCombs
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Re: Transmission shifting question

Postby Don McCombs » Mon Mar 20, 2017 2:44 pm

Have you tried shifting with the clutch in and the engine running? What happens?
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rstoots
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Re: Transmission shifting question

Postby rstoots » Mon Mar 20, 2017 3:03 pm

I just replaced carb. and installed a temp. battery. Motor runs fine And when you push in clutch and force in gear the gears clash but it goes into gear and I could drive and shift from 1st to 2nd while moving but with the clashing sound. As if there was no clutch. What is correct oil for transmission?

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Dale Finch
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Re: Transmission shifting question

Postby Dale Finch » Mon Mar 20, 2017 4:23 pm

You can never shift "on the fly" with a Cub. You must ALWAYS come to a complete stop before changing gears. You basically pick a gear to drive in. If that is the wrong speed or power, stop, THEN shift into a different gear letting out the clutch peddle slowly. Sometimes the cub has a hard time starting in 3rd gear, and be aware it can do so with a startling "leap", so hang on!!

NOTE: If the cub is grinding while trying to shift into gear while stopped, you may just need to adjust the clutch and/or free travel of the clutch pedal.

NOTE #2: Just realized bofahs already said it...Only more succinctly! :lol:
Last edited by Dale Finch on Mon Mar 20, 2017 5:25 pm, edited 3 times in total.

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Urbish
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Re: Transmission shifting question

Postby Urbish » Mon Mar 20, 2017 5:08 pm

I run 80W90 in mine. You'd be wise to download and read the manual for your tractor on this site.

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Glen
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Re: Transmission shifting question

Postby Glen » Mon Mar 20, 2017 6:30 pm

Hi,
They have discussed on this site in the past that some of the new pilot bushings are too small an ID when they are put in the crankshaft. They need reaming inside, to a bigger diameter, or the clutch shaft won't stop turning when you push the clutch pedal down. This sounds like what yours has, but without being there, I don't know. Like Dale said above, the clutch might not be releasing.
Here is the 1947 Cub owner's manual, it's good to read it, if you never have before. It has lots of info about operation, lubrication, and maintenance.
It has no info about the Touch Control, that is in the newer manuals. I put pages from the 1955 owner's manual below too with that info.
Nowadays they use Hy-Tran fluid in the Touch Control, it is sold at Case IH dealers. If you are changing the fluid, be sure to use the procedure on the 3rd page of the Touch Control info below, to get the air out of the system.
Below is a listing at TM Tractor for the pilot bushing, it has pics you can look at.
Also below is a page from the Cub service manual with the end diameter of the clutch shaft, and running clearance for the pilot bushing. :)

http://farmallcub.com/rudi_cub/www.clea ... index.html

http://www.tmtractor.com/new/cl/067fp.htm

http://farmallcub.com/rudi_cub/www.clea ... age-65.jpg

http://farmallcub.com/rudi_cub/www.clea ... age-66.jpg

http://farmallcub.com/rudi_cub/www.clea ... age-67.jpg

http://www.farmallcub.info/manuals/gss- ... 005-02.jpg
Last edited by Glen on Mon Mar 20, 2017 8:14 pm, edited 4 times in total.


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