Transmission fluid, leaking from the brakes?!?!

A

AndrewSpencer

Active member
Spring is coming or it already came and I was too busy. And had some good help today so we drained the transmission, pulled tge cover and put some new in. Chemo brain here said it takes one gallon. Judging by amount pouring out on both sides of the brakes, I suspect maybe I should consult the manual. But I am consulting you all.
I used forklift hft fluid (because amazon could deliver overnight)
Put the whole gallon in and good help snapped a bolt on the shifter cover. Oops.

Did I overfill?
Are there seals that are blown out?
Other words of wisdom?


And I will find my post where I figured out the easy way to reduce file size to upload pictures for you all.
 
A whole gallon?? Definitely overfilled and leaked out. I think the capacity is 3.5 or 4 pints. You also don't need fancy transmission oil. These gearboxes were meant for just regular old 90w gear oil.
 
There is a small square head plug on the left ( sitting on the seat facing forward) of the tranny about halfway down the side, remove it and let it drain. replace when it stops flowing out , and your good to go. coppersmythe......................
 
Thanks everyone.

Any words of wisdom on the cover bolts?
We just snapped a second one. And it was under maybe 2’# of strain. Not even tight enough to compress the split washer then it snapped. Fixing to replace all of them, but find it strange.
 
AndrewSpencer said:
Thanks everyone.

Any words of wisdom on the cover bolts?
We just snapped a second one. And it was under maybe 2’# of strain. Not even tight enough to compress the split washer then it snapped. Fixing to replace all of them, but find it strange.
Click to expand...
Hmm, the transmission cover bolts shouldn't be too fickle unless they were cross-threaded, the threads in the transmission or bolt are buggered up, or the bolt itself had any sort of microfracture that could let it oxidize internally on its horizontal cross section.

How do the threads look? Was the snapped area "clean" metal or did any part of it show sings of corrosion? Are you using an impact, box wrench, or socket wrench? Was there any water or liquid in the hole? I know hammering a bolt into blind hole that has a liquid in it can make it seem like a bolt is "bottoming" out due to you basically compressing said liquid faster than it can work its way out.

Sorry, I'm just throwing things at the wall here.
 
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there is a fill plug behind the cover, no need to take the top off, leak probably from being over filled, drain it and add the correct amount 3.5 pints
 
Hi,
Below is a page from the 1950 Cub owner's manual with specifications.
It shows the oil capacities.
The maximum engine RPM it shows was used up to Cub serial number 192113, then the RPM was increased.
The transmission oil fill plug is just to the rear of the shifter.
The trans oil level plug is low on the left side of the trans, fill it only to there.
The trans oil drain plug is at the bottom of the trans, visible from under the platform.
 
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