Gear Jammin

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AndrewSpencer
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Zip Code: 20855

Gear Jammin

Postby AndrewSpencer » Thu May 12, 2022 7:26 am

Morning all.

Getting my 1953 Cub going strong (right up until the clutch on the brush hog decided the grass was too much) and a problem I am having that I do not fully understand is getting into gear. I am mostly satisfied that the clutch is fully disengaged with full pedal stroke but when I go to put it in gear or engage the PTO I am jamming it into gear. Is there a technique? Do I need to look at the clutch again?

Hope you all have a great Thursday!

Andrew

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Don McCombs
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Re: Gear Jammin

Postby Don McCombs » Thu May 12, 2022 7:49 am

Are you trying to change gears on the move? There is no synchromesh on the Cub transmission, so you must come to a complete stop to change gears or engage the PTO.
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Gary Dotson
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Re: Gear Jammin

Postby Gary Dotson » Thu May 12, 2022 7:54 am

It’s common to have to wait for the transmission to coast down before engaging any gear but if it doesn’t stop spinning after a few seconds you have an issue with the clutch or pilot bushing. Have you done recent clutch work on it? If you replaced the pilot bushing and didn’t ream it to size after installing, that’s likely the issue.

AndrewSpencer
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Re: Gear Jammin

Postby AndrewSpencer » Fri May 13, 2022 8:19 am

No, not shifting on the go. Starting with hand crank, put the clutch in and idle WAY down, then bam, into gear we go.

Yes, just rebuilt the motor replaced the clutch, etc. So what size are we supposed to ream the bushing to? (also give me a chance to get the clutch actually adjusted correctly, not just through inspection plate.

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Re: Gear Jammin

Postby staninlowerAL » Fri May 13, 2022 8:59 am

If you don't want to split the tractor to work on the pilot bushing you might be able to improve/correct the problem by using the PTO shaft to "run" the shaft inside the bushing with the engine off/transmission in neutral and an external power source to turn the shaft. Others on the forum have used this method and been successful to clear up the tight fit problem with the pilot bushing. Try searching this topic using the search function at the top right corner of this page. :hattip:

AndrewSpencer
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Re: Gear Jammin

Postby AndrewSpencer » Fri May 13, 2022 9:43 am

hmm I like that. It just laps itself into place. Also an excuse to use one of these motors I have lying around...

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Glen
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Re: Gear Jammin

Postby Glen » Fri May 13, 2022 8:47 pm

Hi,
I'm not sure what you mean.
I guess you mean the clutch shaft keeps turning when you push the clutch pedal down, and the gears grind as you try to shift, when the Cub is not moving.
Below is info for when your are replacing the clutch, and about the pilot bushing.

1 of the experts on here has said that the pilot bushing, in the end of the crankshaft, doesn't need replacing if it is still good.
Measure it's ID with a dial caliper and if it looks good, it can be used again.

If you replace the pilot bushing, after putting it in the crankshaft hole, be sure to measure it's ID with a dial caliper before putting the pressure plate on the flywheel.
If the clearance is too small, the bushing needs reaming to make it bigger.

The pilot bushing ID can shrink after driving it in the hole. Then if the bushing ID is too small, and you put the Cub together, the clutch shaft won't stop turning when you push the clutch pedal down.
Then the gears grind when trying to shift them.

Below is a page from the Cub and LoBoy service manual, showing the running clearance for the pilot bushing, at Spline and clutch shaft.

http://www.farmallcub.info/manuals/gss- ... 005-02.jpg

If the bushing is too small, it needs reaming.

Besides the pilot bushing, the clutch fingers need to be adjusted high enough that the clutch will release. :)

Gary Dotson
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Tractors Owned: 48 Cub Diesel (Cubota)
53 Cockshutt 20 restored (Shooter)
52 Cockshutt 20 unrestored
47 Leader "B" (Herckie)
49 Leader "D" (Princess)
49 Leader "D" very rough
48 Leader "D" unrestored
Kubota B6200E
Kubota B6200HST
Kubota B8200HST-D
Circle of Safety: Y
Location: OH West Mansfield

Re: Gear Jammin

Postby Gary Dotson » Sat May 14, 2022 6:00 am

If I remember correctly, I have my adjustable reamer set to .627”. That gives about .002” clearance.

AndrewSpencer
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Re: Gear Jammin

Postby AndrewSpencer » Wed May 18, 2022 7:01 am

Just happened to have a motor with V belt pulleys setup on it so we ran that for maybe 10 min yesterday. Getting the clutch tied down all the way proved to be the hardest part. Ended up securing to the pulley for the belly mower. It seems to be better, however, I am hopeful that I can get it torn down a properly honed before the 4th of July.

Thank you all for your help!

Andrew
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Dale Finch
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Re: Gear Jammin

Postby Dale Finch » Wed May 18, 2022 2:15 pm

This was my solution to holding the clutch pedal down, recently:
20211115_145959 (Small).jpg

NOTE: for you sharp-eyed folks, I was not finished routing the new battery cable. It did eventually go between the clutch/brake peddle shaft and the platform with the clamp-on chafe guard!! :wink:
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AndrewSpencer
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Joined: Tue Mar 15, 2022 7:19 pm
Zip Code: 20855

Re: Gear Jammin

Postby AndrewSpencer » Wed May 18, 2022 7:07 pm

Dale, much more elegant solution! I thought it made a difference but I installed the new clutch mechanism on the belly brush hog and got to mowing today and decided that it didn't actually make that much of a difference. If I am painting anyway I suppose splitting isn't too much further (I know, I know, I am just supposed to hose the paint on and make it look original) :)


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