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Farmall Cub transmission

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Scott in ME
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Farmall Cub transmission

Postby Scott in ME » Tue Nov 19, 2019 2:08 pm

Here is an issue that really has me scratching my head. I'll tell the whole story, though most of it may not be relevant. I bought this tractor as a non-runner, got it running over the summer, and drove it around my yard a few times. My real reason for buying was to clear snow. Disclaimer - I never changed the transmission oil.

I recently had a pair of ag tires mounted and while I was at it, added some wheel weights that came with the tractor. It had gotten much colder when I went to reattach the wheels, and the wheels wouldn't turn (making the job much harder). By "not turn," I mean they felt like the tractor was in gear (moving back and forth an inch or so), not like the brakes were stuck on. I panicked about never having changed the transmission oil, and went to drain it. Nothing came out. I really panicked. As an experiment, I added about 1/2 quart of gear oil (all I had) and it did not drain out. Finally, this morning the wheels would turn (it's much warmer out, if that matters). Following earlier threads I found here, I added Kerosene to the transmission until it came out the "full" plug (1/4" NPT plug on the side). Started it up and drove back and forth a few times before I couldn't get it out of gear (may be an unrelated problem).

Went to drain the Kerosene out, and got only a few trickles or drops coming out the drain. It's coming out drop by drop as I write this. I attached a lousy quality photo below with my jack handle pointing to the transmission drain - just to make sure I'm draining from the right place.

Where is the Kerosene hiding? Is it somewhere with the oil that should have been in there? I'll get to the shifting problem later. I appreciate all the wisdom here. Thank you.

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Slim140
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Re: Farmall Cub transmission

Postby Slim140 » Tue Nov 19, 2019 2:10 pm

Could just be crud has the drain hole stopped up. Take a screwdriver and stick in the drain hole and see what happens. Be prepared for a bath.
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Re: Farmall Cub transmission

Postby Barnyard » Tue Nov 19, 2019 2:17 pm

Take the shifter off and look inside. Not sure how could it is where you are, but if water is in it you may have ice blockage.
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Re: Farmall Cub transmission

Postby Lt.Mike » Tue Nov 19, 2019 2:37 pm

Barnyard wrote:Take the shifter off and look inside. Not sure how could it is where you are, but if water is in it you may have ice blockage.

That’s what I’m thinking. Depending on how much ice you’ve got you may not be able to pull the top if the forks are frozen in place.
I had a tractor freeze up as it had water in the gear oil. It wouldn’t come out of gear or roll.
I set a heat gun under it on a wood block warming it up for about a 1/2 hour. Once the trans felt warm or at least not frozen I pulled the plug again and drained a lot of water out.
It would now shift and roll. I was lucky it didn’t crack the case.
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Re: Farmall Cub transmission

Postby Don McCombs » Tue Nov 19, 2019 2:39 pm

Put the drain plug back in, throw a tarp over the tractor and put a 100 watt incandescent light bulb safely under the tarp and leave it there for 24 hours. As Bill alluded, you quite likely have a block of ice under your gear oil/kerosene mixture. Melting the ice will allow everything to drain. Replace with 3.5 PINTS of gear oil.
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Re: Farmall Cub transmission

Postby Cubfriend » Tue Nov 19, 2019 2:42 pm

Oil floats on top of water. Water will freeze in the bottom. Do you have a magnetic heater to attach to the side of the transmission to melt any ice present? Warm it up somehow. Heat gun. Light bulb. Just be careful not to start a fire with the kerosene. Good Luck!
Frank

Scott in ME
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Re: Farmall Cub transmission

Postby Scott in ME » Tue Nov 19, 2019 4:05 pm

Thank you all. Underneath the cover that the shifter connects to was a remarkable amount of ice. I stuck a long screwdriver in the drain hole and more chunks of ice came out. I ended up holding a heat gun right over the fill hole for close to an hour, watching a combination of water and kerosene (mostly water) come dribbling out. I stopped when the drain area felt slightly warm to the touch. Used the same heat gun to get all the ice from under the shifter. Dumped some kerosene in afterwards, and it now shifts much easier. It’s getting dark, so tomorrow I’ll fill it with oil and maybe all the issues will go away. Shame on me for not draining the transmission oil when the summer sun was out. Thanks for the help!

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Re: Farmall Cub transmission

Postby Barnyard » Tue Nov 19, 2019 4:26 pm

While the kerosene is in there, drive the Cub for about5 minutes to slosh the kerosene around. This will clean up the inside of the trans ang get rid of the water/lube mix. Then drain the kerosene and refill with the recommended 3.5 pints of gear lube.
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Re: Farmall Cub transmission

Postby BigBill » Tue Nov 19, 2019 4:36 pm

I use a spot light bulb on one of those spring bulb holders with the light shield near the tranny to heat it. Overnight
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.


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