[AT] Gearbox breather plug

[charlie hill]

Mike, not doubting you but have you looked very closely at that plug?
I've seen some that were pipe plugs with a square head that had a small
vent hole drilled in the side of one of the square flats, into the hollow of 
the plug.
They get stopped up.

If not you can make one that way.

Charlie

-----Original Message----- 
From: Mike M
Sent: Monday, June 12, 2017 12:58 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Gearbox breather plug

Mark, it's 3/8" pipe thread.

On 6/12/2017 12:03 PM, Mark Greer wrote:
> What thread size is the plug?
> Mark
>
> ----- Original Message -----
> From: Mike M <meulenms at gmx.com>
> To: Antique tractor email discussion group <at at lists.antique-tractor.com>
> Sent: Mon, 12 Jun 2017 11:20:21 -0400 (EDT)
> Subject: Re: [AT] Gearbox breather plug
>
> Thanks Cecil, my plug is a solid plug with no hollow area in it. I'll
> drill it length wise and try the cotter pin idea.
>
> Mike M
>
> ps - tried to reply directly, but your isp doesn't like my email 
> provider:)
>
> On 6/12/2017 8:39 AM, Cecil Bearden wrote:
>> I would drill a 1/8"hole in the plug.  If the plug you have is hollow
>> up  in the square end of the plug, then I would drill the hole
>> sideways.  If not then drill the center nearly to the end, then drill
>> sideways until you intersect your previous hole.  Or drill straight
>> through, install a cotter pin to keep it clear and cover the box when
>> stored..  Weather changes will cause a box to suck oil in at the input
>> shaft.  I also would use corn picker grease  or called 00 grease.
>>
>> Cecil in OKla
>>
>>
>> On 6/11/2017 11:34 PM, Mike M wrote:
>>> Hi all, I have JD 513 rotary mower, and am getting set to cut my fields
>>> while we have a dry spell. When I first bought the mower, the oil was
>>> milky, so I changed it, and it ran fine for the next 3 years. Today, I
>>> checked the oil, and the level was fine, but it was milky again. It's
>>> either been stored under cover, or had a 5 gallon plastic pail over the
>>> gearbox. I noticed one thing in particular tonight, and that is the
>>> gearbox is not vented. Neither the fill or the check plugs have breather
>>> holes in them. I bought this at an auction so the previous history is
>>> unknown, but I was under the impression that all gearboxes needed a way
>>> to vent. I'm not losing oil through any seals at this point, so that is
>>> good. Any thoughts would be appreciated.
>>>
>>> Thanks,
>>> Mike M
>>>
>>> ---
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