TC33DA - what is the purpose of this cotter pin?

[adlertom]

On the underside of my TC33DA, there's what looks like a cotter pin sticking out. Photo attached. What is it's purpose?

 

[TractorTech]

Cotter pins in bell housings keep the drain hole in the housing from gumming up with oil and debris.

 

[Hughman]

I've always wondered the same thing

 

[nyone]

Cotter pins in bell housings keep the drain hole in the housing from gumming up with oil and debris.

This
Prety standard practice in more than just tractors.

 

[Redbug]

Wow! That is something new to me as well!