Missing Plug on Drive Shaft Housing

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Hollyforestcub
Posts: 6
Joined: Sat Jul 10, 2021 11:41 am
Zip Code: 19970
Tractors Owned: 1949 Cub

Missing Plug on Drive Shaft Housing

Postby Hollyforestcub » Thu Aug 26, 2021 7:22 pm

Greetings.

We are new Cub owners. today I noticed small oil dripping from the driveshaft housing. The housing has a 3 1/2” hole on the bottom. Open to the housing.

I looked a a neighbor’s Cub and it looks like I am missing a 3 1/2” plug. His Cub has this plug and it look like it has a dimpled surface. It seems to be pressed in as I see no threads.

Anyone know what this part is called and if I can get a replace

A search of areas where I have driven the tractor has turned up nothing

Thanks. John

Clemsonfor
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Zip Code: 29848
Tractors Owned: Yanmar YM2000
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1952 Farmall Cub
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Location: Greenwood County SC

Re: Missing Plug on Drive Shaft Housing

Postby Clemsonfor » Thu Aug 26, 2021 8:03 pm

Thats the inspection cover. You can adjust the clutch through it. You can buy it look at one of the sponsors here or look for it on eBay or Amazon. It has a little bracket that grabs the inside of the casing and has a wing nut that tightens down on it.

Here one is on eBay. This is not my item nor do I know the guy, just the first one that was on the search and he has good pics .
https://www.ebay.com/itm/Farmall-Cub-cl ... 632-2357-0

tst
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Re: Missing Plug on Drive Shaft Housing

Postby tst » Thu Aug 26, 2021 8:52 pm

when you replace the cover I use a drop of locktite on the wing nut, the vibration shakes it loose and then it does what happened to yours, it is a cover only, your oil drip is another issue, engine oil or transmission oil?

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Don McCombs
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Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
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1978 International Cub
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Location: MD, Deep Creek Lake

Re: Missing Plug on Drive Shaft Housing

Postby Don McCombs » Thu Aug 26, 2021 9:51 pm

Don McCombs
MD, Deep Creek Lake

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Glen
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Re: Missing Plug on Drive Shaft Housing

Postby Glen » Fri Aug 27, 2021 1:36 am

Hi,
The hole is for clutch access. The cover is shown in the Cub owner's manual.
There is a grease fitting there you should grease if you haven't.
The fitting is on the throwout bearing. They say on here use cheap grease, so the oil in the grease absorbs into the graphite material in the throwout bearing. The original style bearing doesn't turn, it is a solid bearing.
Below is a page from the 1949 Cub owner's manual showing the clutch and the grease fitting, in the lower pic on the page.
The page is in the owner's manual I posted for you in July, at the Introduce Yourself section.
You can get to your posts at the top left of the page, at Quick links, then click on Your posts. :)

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

dbates
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Re: Missing Plug on Drive Shaft Housing

Postby dbates » Fri Aug 27, 2021 12:01 pm

On a related note - My Cub has the 351686R3 torque tube and just behind the hole referenced in this conversation mine has a hole (1/2' or so) near the big 3' hole referenced where oil is running out of mine. It is maybe 1 inch from where the tractor can be split in half. I am trying to determine if that hole is missing a drain plug or if maybe a frost plug?

tst
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Re: Missing Plug on Drive Shaft Housing

Postby tst » Fri Aug 27, 2021 12:18 pm

that hole is left open

Clemsonfor
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Zip Code: 29848
Tractors Owned: Yanmar YM2000
Yanmar YM186 (non running)
1952 Farmall Cub
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Location: Greenwood County SC

Re: Missing Plug on Drive Shaft Housing

Postby Clemsonfor » Fri Aug 27, 2021 3:09 pm

No frost plug in the torque tube. There should be nothing bin there and the hole is to allow oil out so it doesn't build up and soak the clutch.

Hollyforestcub
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Zip Code: 19970
Tractors Owned: 1949 Cub

Re: Missing Plug on Drive Shaft Housing

Postby Hollyforestcub » Fri Dec 10, 2021 7:19 pm

I was able to replace the missing cap. This was during the summer and the oil drip was from a grease fitting.

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Peter Person
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Re: Missing Plug on Drive Shaft Housing

Postby Peter Person » Fri Dec 10, 2021 8:46 pm

As Glen stated the grease fitting you see is for the graphite clutch throwout bearing. Only use an inexpensive grease that allows the oil to saturate the graphite. The TSC green tube is what most of us use. A couple of times per year depending on use is sufficient. Pump the grease in until it comes out the hole on top of the bearing.
The oil could be transmission gear oil flowing downhill from the input shaft seal.
The rear seal on the engine does go bad, but that would leak out from the 1/2 moon cover plate behind the oilpan, attached to the torque tube.
1957 Farmall Cub "Emory", Fast-Hitch, L-F194 Plow & Colter, L-38 Disc Harrow, Cub-54A Blade, Cub-22 Sickle Bar Mower, IH 100 Blade

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Crimson Tim
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Re: Missing Plug on Drive Shaft Housing

Postby Crimson Tim » Sat Dec 11, 2021 12:29 am

The inspection cover really isn’t going to do much to contain an oil leak.
I suppose it’s possible if the check valve in a zerk fitting fails, but I’ve never heard of oil dripping from a grease fitting.
Mainly, the two sources of oil in there would be the rear main seal on the engine, which as mentioned, you would usually see at the half-moon cover, or the front seal on the transmission.
I hear a leak from the transmission will collect in a depression toward the rear of the housing, so nosing the Cub down a hill can can cause a big blurp of collected oil to leak out all at once.
Not sure how either source could splash up onto the grease fitting to make it look like that’s the source for the leak, but these are the two I have often heard about in there.


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