Clutch Issue

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
User avatar
clintmo
Cub Star!!
Cub Star!!
Posts: 379
Joined: Thu Apr 17, 2014 9:54 pm
Zip Code: 26033
Tractors Owned: 49 Cub
55 Cub
Circle of Safety: Y
Location: Cameron, WV

Clutch Issue

Postby clintmo » Wed Jun 13, 2018 10:23 pm

I have never done anything relating to the clutch on any of my Cubs. I'm pretty in the dark in this area. On my lawnmower Cub, when the tractor is in neutral and the clutch pedal is depressed, the shaft continues to spin. You can get it into gear but it isn't pretty. My work-around has been to start the tractor in gear with clutch depressed. When the PTO is engaged I can shift gears without trouble. If the PTO is not engaged I can't shift gears without the shaft starting to spin as soon as I take it out of gear on the way to the next.

What's going on here and what do I need to do about it?

Thanks,
Clint

User avatar
Glen
5+ Years
5+ Years
Posts: 2518
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: Clutch Issue

Postby Glen » Thu Jun 14, 2018 1:25 am

Hi,
The Cub clutch is not complicated.
It sounds like your throwout bearing is not pushing the pressure plate fingers far enough ahead for the clutch to fully release.
This can be caused by the clutch pedal free play being adjusted wrong. The pedal should have 1" free play, measured where you put your foot on it. The pedal has to be easy moving at the base, and not tight, the base should be oiled where it moves in the housing, and there should be a return spring, under the platform, to pull the pedal up against the edge of the platform. The brake pedals should have springs too.
Then, if the free play is correct, the throwout bearing graphite might be worn down, or the 3 pressure plate fingers adjusted too low, and needing raising up.
There have been other people recently on here with the same problem.
Below is a recent post I posted info at telling about fixing a problem like you described. Read my post on the page. :)

viewtopic.php?f=1&t=101050

If your Cubs are 1949, and 1955, they originally came with the clutch pedal free play adjustment at the clutch pedal base. The post in the link above is written for the older style adjustment. So you would simply loosen the adjustment bolt at the pedal, and move the throwout bearing back, to get more room to adjust the fingers.
The guys on here have said to set the finger height at 1 1/4" for the style of free play adjustment your Cubs have.
Below is a page from the 1949 Cub owner's manual showing the clutch.

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

Below is a pic of a new throwout bearing. The material sticks out 5/16". If yours are worn down so the graphite is near the level of the metal part of the bearing, they probably needs replacing.
Attachments
Cub 2.jpg
Last edited by Glen on Fri Jun 15, 2018 5:56 pm, edited 1 time in total.

Scrivet
5+ Years
5+ Years
Posts: 2646
Joined: Sun Apr 19, 2009 9:51 pm
Zip Code: 63664
Location: MO, Potosi

Re: Clutch Issue

Postby Scrivet » Thu Jun 14, 2018 6:30 am

clintmo wrote:....when the tractor is in neutral and the clutch pedal is depressed, the shaft continues to spin. .......................... When the PTO is engaged I can shift gears without trouble. If the PTO is not engaged I can't shift gears without the shaft starting to spin as soon as I take it out of gear on the way to the next.
.........
Sounds to me like you have a sticky pilot bearing, not a clutch problem. The load of trying to spin the belts and blades is enough to overcome the stickiness. With the PTO disengaged there is no load so the sticky bearing wins and keeps spinning the driveshaft.

I've never tried it but has been mentioned often to point the Cub nose down on the steepest hill you can find and using a couple extension straws spray your favorite lube as near as you can to the clutch disc on the driveshaft so the lube can run down the shaft to the pilot bearing.

User avatar
Denny Clayton
10+ Years
10+ Years
Posts: 4308
Joined: Wed Feb 05, 2003 1:18 pm
Zip Code: 45365
Tractors Owned: Home to "Rusty", the 2007 and 2009 Cub Tug Champion.
Circle of Safety: Y
Location: OH, Sidney

Re: Clutch Issue

Postby Denny Clayton » Thu Jun 14, 2018 11:34 am

Scrivet wrote:
clintmo wrote:....when the tractor is in neutral and the clutch pedal is depressed, the shaft continues to spin. .......................... When the PTO is engaged I can shift gears without trouble. If the PTO is not engaged I can't shift gears without the shaft starting to spin as soon as I take it out of gear on the way to the next.
.........
Sounds to me like you have a sticky pilot bearing, not a clutch problem. The load of trying to spin the belts and blades is enough to overcome the stickiness. With the PTO disengaged there is no load so the sticky bearing wins and keeps spinning the driveshaft.

I've never tried it but has been mentioned often to point the Cub nose down on the steepest hill you can find and using a couple extension straws spray your favorite lube as near as you can to the clutch disc on the driveshaft so the lube can run down the shaft to the pilot bearing.

:Dito:
'61 Lo-Boy
'60 FH Lo-Boy
'60 Lo-Boy
'57 FH Cub "Rusty"
FH Woods 42F, 54A blade, 194 plow, FH L-38 disk, FH Lo-Boy disk, FH platform carrier
Image
Circle of Safety

Matt Kirsch
10+ Years
10+ Years
Posts: 4581
Joined: Tue Jun 08, 2004 3:04 pm
Zip Code: 14559
Circle of Safety: Y
Location: Rochester, NY

Re: Clutch Issue

Postby Matt Kirsch » Thu Jun 14, 2018 1:40 pm

Could be either-or. A split may be necessary to find out.

User avatar
Glen
5+ Years
5+ Years
Posts: 2518
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: Clutch Issue

Postby Glen » Thu Jun 14, 2018 6:43 pm

Hi,
Yes, it could be the pilot bushing too, if it has somehow gotten too binding with the shaft.

If you take it apart, Boss Hog said lately at another post that the pilot bushing usually doesn't need replacing, measure it and the shaft, and see if they are good.
Some of the new pilot bushings are too tight to the shaft, after being driven into the crankshaft hole, the bushing shrinks slightly, and is too tight, then the clutch shaft won't stop turning when you push the clutch pedal down.
The bushing and shaft need measuring before putting the pressure plate on. The bushing needs reaming to the right size if it is too small. The clearance is in the Cub service manual. :)

User avatar
clintmo
Cub Star!!
Cub Star!!
Posts: 379
Joined: Thu Apr 17, 2014 9:54 pm
Zip Code: 26033
Tractors Owned: 49 Cub
55 Cub
Circle of Safety: Y
Location: Cameron, WV

Re: Clutch Issue

Postby clintmo » Sat Jun 16, 2018 8:57 am

Thanks, guys. I'll report back once I've had a chance to check it out further.

Clint


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: Rick Spivey and 7 guests