Farmall cub will not speed up

[jsdorn]

My 1948 Farmall cub will not gain speed when I push the lever all the way past notches.When I start to plow it has no power to keep plowing .What would be the problem? Could it be the governor and if it is how would I fix it?

 

[wore out]

My 1948 Farmall cub will not gain speed when I push the lever all the way past notches.When I start to plow it has no power to keep plowing .What would be the problem? Could it be the governor and if it is how would I fix it?

If the engine stays at idle when you advance the throttle it COULD have a broken governor spring.

If it DOES rev up when you advance the throttle, then lack power and slow down when a load is put on it, that may well be a fuel flow issue, which includes the sediment bowl and screen, the fuel line, and the carburetor being able to flow enough fuel to carry the load.

 

[grandpa Love]

My 1948 Farmall cub will not gain speed when I push the lever all the way past notches.When I start to plow it has no power to keep plowing .What would be the problem? Could it be the governor and if it is how would I fix it?

Most likely issues. #1 the governor linkage arms are "froze up" and not moving. #2 the spring on the governor is worn out or broken. #3 timing is way off. #4 carb has blockage,needs cleaning. #5 it needs a good tune up with quality parts. BUT if I was a betting man I would go with #1. Feel free to call or text me. Happy to help. We have bought,sold , collected,worked on 75+ cubs over the last 4-5 years

 

[Brownie450]

Air cleaner cup full of dirt restricting air flow?
Jim

 

[jsdorn]

If the engine stays at idle when you advance the throttle it COULD have a broken governor spring.

If it DOES rev up when you advance the throttle, then lack power and slow down when a load is put on it, that may well be a fuel flow issue, which includes the sediment bowl and screen, the fuel line, and the carburetor being able to flow enough fuel to carry the load.

The speed does go up but not enough to plow.If the engine goes up some does that mean the governor may be ok?or could there still be a problem with the governor.

 

[jsdorn]

Most likely issues. #1 the governor linkage arms are "froze up" and not moving. #2 the spring on the governor is worn out or broken. #3 timing is way off. #4 carb has blockage,needs cleaning. #5 it needs a good tune up with quality parts. BUT if I was a betting man I would go with #1. Feel free to call or text me. Happy to help. We have bought,sold , collected,worked on 75+ cubs over the last 4-5 years

If I take the front governor cover off will I be able to see a broken spring or will I need to go further.

 

[used red MN]

If I take the front governor cover off will I be able to see a broken spring or will I need to go further.

The governor spring is external, in the linked video you can see it at 3:55, at 6:20 he shows where it is when installed on the tractor.
Cub governor video
By the way what that guy says in the video about the governor causing a carb to “load up” is in error, I just chose the video because it shows the spring. If you are looking for manuals for your Cub let me know I will help you access some.

 

[wore out]

If I take the front governor cover off will I be able to see a broken spring or will I need to go further.

Don't be in too much of a hurry to get deeper into this than you may need to... as you move the throttle lever from idle to maximum you should feel an increasing resistance to movement of the lever IF the linkage and spring are intact.

If the throttle lever moves absolutely freely from idle to maximum with no increasing resistance at all that indicates a linkage issue (which you can visually verify) or a failure of the governor spring which would probably be hanging there broken or disconnected.

If you DO need to remove the governor, have a manual at hand or ask what needs to be paid attention to BEFORE doing it.

 

[leroy in ne]

Air cleaner cup full of dirt restricting air flow?
Jim

Not cub but Super A. I found the inlet pipe for the air cleaner nearly plugged from oil fumes and dust causing restricted air flow. Another place to check and clean.

 

[jsdorn]

The governor spring is external, in the linked video you can see it at 3:55, at 6:20 he shows where it is when installed on the tractor.
Cub governor video
By the way what that guy says in the video about the governor causing a carb to “load up” is in error, I just chose the video because it shows the spring. If you are looking for manuals for your Cub let me know I will help you access some.

Some on YouTube says the timing marks on the fly wheel are on the side of the gear facing the magnito to time the governor. Why are the governor timming marks not visible when the governor is remove Please let me know.Thanks for your help

 

[grandpa Love]

Some on YouTube says the timing marks on the fly wheel are on the side of the gear facing the magnito to time the governor. Why are the governor timming marks not visible when the governor is remove Please let me know.Thanks for your help

Correct,if you remove the governor on a cub with a magneto you must get the governor back in the correct place, unfortunately those markings are on the back of the gear and not visible from the governor side. If you remove the magneto, there is a seal between the magneto and governor.....so you still can't see the marks. From the governor side there are viable marks on the gear ,these are not the ones you line it up with. If you remove the governor and need to line it up again let me know,I have a couple motors sitting around,I can count how many teeth from those front marks to the ones you can't see. You can simply remove the governor housing,clean it and lube everything, leaving the actual governor stuck in place. I have provided my phone number....... I'm well known here, you are in no danger calling me .

 

[jsdorn]

Correct,if you remove the governor on a cub with a magneto you must get the governor back in the correct place, unfortunately those markings are on the back of the gear and not visible from the governor side. If you remove the magneto, there is a seal between the magneto and governor.....so you still can't see the marks. From the governor side there are viable marks on the gear ,these are not the ones you line it up with. If you remove the governor and need to line it up again let me know,I have a couple motors sitting around,I can count how many teeth from those front marks to the ones you can't see. You can simply remove the governor housing,clean it and lube everything, leaving the actual governor stuck in place. I have provided my phone number....... I'm well known here, you are in no danger calling me .

I removed the governor housing and when you push the throw out bearing only one side opens and fingers that push on the bearing one is broken.It looks like I need another governor. I know trying to time the governor with the magneto would be next to impossible for me with matching the timing marks

 

[grandpa Love]

I removed the governor housing and when you push the throw out bearing only one side opens and fingers that push on the bearing one is broken.It looks like I need another governor. I know trying to time the governor with the magneto would be next to impossible for me with matching the timing marks

I have a box full of governors....used original,we sell and ship

 

[E.B. Haymakin']

My 1948 Farmall cub will not gain speed when I push the lever all the way past notches.When I start to plow it has no power to keep plowing .What would be the problem? Could it be the governor and if it is how would I fix it?

If your still unsure of what's of what's going grandpa Love can be a lot of help for you. Shoot some video of what's going on and contact him

 

[jsdorn]

I have a box full of governors....used original,we sell and ship

What would be the cost to ship one to Telford Pa 18969 and how would I time it to my magneto without removing the Magneto.Please let me know

 

[grandpa Love]

What would be the cost to ship one to Telford Pa 18969 and how would I time it to my magneto without removing the Magneto.Please let me know

Call me.....im happy to help, offer advice, sell parts .....what ever....but at some point when money has to change hands we have to communicate. We sell hundreds upon hundreds of parts every year. At least a dozen members of this forum have been to our house. One guy and his wife drop by every year on their way to FL. ...... Richard G was here yesterday from SC....

 

[Dave BN]

I would call grandpa love if I were you. He is an honest and helpful man
Dave

 

[jsdorn]

Call me.....im happy to help, offer advice, sell parts .....what ever....but at some point when money has to change hands we have to communicate. We sell hundreds upon hundreds of parts every year. At least a dozen members of this forum have been to our house. One guy and his wife drop by every year on their way to FL. ...... Richard G was here yesterday from SC....

where are located and when would be the best time to call you.My name is Jerry Dorn.I live in Pa. What is your phone number Please let me know

 

[used red MN]

where are located and when would be the best time to call you.My name is Jerry Dorn.I live in Pa. What is your phone number Please let me know

Maybe you already figured this out, he posted a picture of his business card in reply 3.

 

[grandpa Love]

where are located and when would be the best time to call you.My name is Jerry Dorn.I live in Pa. What is your phone number Please let me know

Call anytime,if I don't answer leave a message I will call back. We are semi retired, self-employed and are home most of the time.