Top seal on bush hog

[MikeA57]

I blew the top seal on my bush hog out last weekend so this morning I dug into it to fix it. A buddy of mine told me that most likely the reason that it failed was because the vent hole got clogged creating pressure until it failed. Sounded reasonable so I started looking around the gear box for a "vent". I don't see anything that looks like it would be one. Is this vent on very BH gear box or just some of them? Where would I look? What does ir look like?

Thanks!

Mike

 

[PoorPlowboy]

Almost always the vent plug is the fill plug on top of the gearbox.

 

[MikeA57]

Thanks, I'll check that but I'm almost sure the fill plug is nothing more than a square headed bolt. I'll look closely at it though to see if I can see some holes in it.

 

[Rocky Hoffler]

Check vent to see if its in fill plug. to make sure its not stopped up you can simply blow into it air should escape

 

[tcreeley]

I had the seal blow out right after I overfilled it with new oil. I replaced the seal, paid attention to not overfilling, and have not had a problem since.

 

[Kolinek]

I have a Bush Hog 720 and I can't get the vent plug out. What size socket does it take?