Mystery Hole Above '51 CUB PTO

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Gary1959
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Mystery Hole Above '51 CUB PTO

Postby Gary1959 » Mon Oct 09, 2017 11:24 am

On my '51 Cub, there is a hole above the PTO... see pic below. Anyone know what this is? I'm not sure if it goes into transmission but suspect it does and of course water infiltration a concern. Maybe it's a bolt hole and I can just plug it with grease or something. Many of you have torn these apart... what do you think that hole is? THanks in advance.
Mystery Hole Above PTO - '51 Cub .JPG

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Urbish
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Re: Mystery Hole Above '51 CUB PTO

Postby Urbish » Mon Oct 09, 2017 11:32 am

That's just another tapped blind hole into the casting. On many tractors it has a cork stuffed into it. You can test for infiltration by squirting some oil in there and seeing if it drains away. I'm guessing it won't flow anywhere. You can see it in full in this image:
Image

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indy61
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Re: Mystery Hole Above '51 CUB PTO

Postby indy61 » Mon Oct 09, 2017 11:44 am

It may have a breather/vent in that location.

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Re: Mystery Hole Above '51 CUB PTO

Postby Matt Kirsch » Mon Oct 09, 2017 12:15 pm

The shifter tower is where the transmission housing "breathes." It is not airtight.

That's a blind hole, and you can verify it yourself by poking around with a stiff wire.

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Re: Mystery Hole Above '51 CUB PTO

Postby indy61 » Mon Oct 09, 2017 12:49 pm

I'm pretty sure the IH Cub Cadet hydros had a breather in that location. They used the same trans. I don't know why an early F-Cub would have that blind hole.

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Re: Mystery Hole Above '51 CUB PTO

Postby Bill E Bob » Mon Oct 09, 2017 3:13 pm

Isn't that an alignment pin for the PTO assembly?

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Re: Mystery Hole Above '51 CUB PTO

Postby Urbish » Mon Oct 09, 2017 4:08 pm

Bill E Bob wrote:Isn't that an alignment pin for the PTO assembly?


The arrow in his photos is pointing at the bolt hole that is partially visible where the rear rockshaft bracket attaches to the top of the trans.

Gary1959
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Re: Mystery Hole Above '51 CUB PTO

Postby Gary1959 » Mon Oct 09, 2017 5:12 pm

Urbish... that could well be so should I assume that previous owner improperly installed the hydraulic arm piece? That arm piece works so perhaps I should just fill this how with cork or grease and forget about it.

When we drained the transmission oil, it had some water in it and we weren't sure if it got in through this hole OR just naturally over the last 68 years!

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Re: Mystery Hole Above '51 CUB PTO

Postby Urbish » Mon Oct 09, 2017 6:15 pm

I would get a cork at a hardware store or whittle down a wine cork to shove into the hole and forget about it. Water generally enters the transmission via the shifter. If the tractor was stored outside for some time, it generally will accumulate some water.

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Re: Mystery Hole Above '51 CUB PTO

Postby Puffie40 » Wed Oct 11, 2017 1:50 pm

If I'm not mistaken I believe that bolt hole is used for the manual lift.

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Re: Mystery Hole Above '51 CUB PTO

Postby Chipmaker » Wed Oct 11, 2017 1:55 pm

Puffie40 wrote:If I'm not mistaken I believe that bolt hole is used for the manual lift.

Nope. Here's a picture of the three bolt holes. There's nothing that sticks through (like a bolt head) that would go into the counter-bored hole on the tranny.
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Re: Mystery Hole Above '51 CUB PTO

Postby 64/67lo-boy » Wed Oct 11, 2017 3:39 pm

My guess would be a hole that is used to alighn the case in a jig for machining at the factory. Just another factory mystrey hole.
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