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Out mowing with the AC 160 (leaky seal?)

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garden_guy View Drop Down
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    Posted: 03 Jul 2020 at 7:49pm
Dave, I could find zero information on what I was looking for. Whereas those breather plugs operate both directions all the time, I believe the ones I bought in the "1-5 PSI range" means that they have a 1-5 PSI cracking pressure before they open, which I feel is pretty low. Fingers crossed that fixes it for me, but if not, I have a breather like you have to put in the other plug spot.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2020 at 5:43pm
Well, I was fortunate and didn't have problems to start with, so hope this new plug will prevent any possible future problems.  Very interesting to find out all of this information about breather plugs and the need for them.  Did not even have any knowledge of them until I had issues with the single action cylinder on my shredder.  Got it rebuilt with one of those plugs installed and it has worked fine.  Can anyone explain the PSI needs/requirements?  As I mentioned, mine said 150 psi.  You state 1-5 psi.  What's the deal? 
Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2020 at 5:23pm
Looks nice Dave! I got that kind of breather plug that will fit in the filler neck. I've got an original style "grease zerk" looking plug coming from ebay this week. Really hoping this solves the issue -- let me know how yours works for you!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2020 at 10:40am
Here is a picture of the breather plug I installed.  It is the screen type plug as discussed above.  Also, are some pictures of the plugs I removed.  The one on the left is from my 172 spreader.  On the right, from my snap coupler spreader.  Hope this works.








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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jul 2020 at 10:04pm
Got a pair of 1-5 PSI replacement plugs on my way from ebay. They appear to be 1/8" NPT.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jul 2020 at 9:26pm
Originally posted by garden_guy garden_guy wrote:

Originally posted by SteveM C/IL SteveM C/IL wrote:

I can't tell from pic but isn't that one of those spring loaded reliefs that look like a grease zerk at first glance.


Looks like this similar part from Fastenal to me. Maybe I'll just see if I can find a drop in replacement.

That looks like original. Just a little spring loaded pin with head on it. HTH Tracy
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jul 2020 at 7:41pm
Been spraying this with PB Blaster for off and on for a few weeks now. Came right out today, and man it was plugged up good. Nothing I tried would touch the gunk in here; I'd say its toast. I ordered a new one of the 1-5 PSI range from ebay.




Tried at Fastenal but the guy looked at me like I was crazy when I showed him the part I was looking for, haha.


Edited by garden_guy - 02 Jul 2020 at 7:42pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2020 at 1:34pm
Well, it takes a 1/8" breather plug for both my 172 spreader and my 5' snap coupler spreader.  Surplus Center does not carry these.  Plus, they only have curb side pick up due to the virus, so I wasn't able to go in and compare with what they had to readily determine the proper size.  Ended up keeping the couple 1/4" plugs I purchased to compare with what I had.

Went to Central States Hydraulic Services in Lincoln and picked up a couple of the 1/8" breather plugs and just got them installed.  $2.88 each.  Invoice says max press 150 psi and max temp 300F.  All ready to go now, I guess.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2020 at 4:28am
Originally posted by garden_guy garden_guy wrote:

Well it sure seems like a good upgrade to me. Works better than the "plugged vent" I've got going now, haha.

Any idea how many PSI the original relief vent was supposed to be? I see replacements in the 0.25 to 1.0 PSI range, or the 1 to 5 PSI range, or even higher.

It can't be much pressure.  Brings to mind another thought. Have you got a IR thermometer?  If so, see what the temperature that gearbox is running, when its hot.  Much over 250ºF, and your oil is close to burnin...Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2020 at 12:56am
Well it sure seems like a good upgrade to me. Works better than the "plugged vent" I've got going now, haha.

Any idea how many PSI the original relief vent was supposed to be? I see replacements in the 0.25 to 1.0 PSI range, or the 1 to 5 PSI range, or even higher.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2020 at 5:58pm
The whole reason I posted it, was that its cheap, and has no moving parts, to fail.  Only here can we debate the virtues of a part, that costs less than $5...Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2020 at 4:17pm
I plan on stopping by Surplus Center on Monday to see if they have the breathers that will fit the breather hole and how much they are.  I need a couple of them.  I'll let you know what I find out and how much they are.  Dave
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2020 at 1:19pm
Originally posted by SteveM C/IL SteveM C/IL wrote:

I can't tell from pic but isn't that one of those spring loaded reliefs that look like a grease zerk at first glance.


Looks like this similar part from Fastenal to me. Maybe I'll just see if I can find a drop in replacement.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2020 at 12:29pm
I can't tell from pic but isn't that one of those spring loaded reliefs that look like a grease zerk at first glance.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2020 at 11:30am
Hmmm I see places like Fastenal sell a 1/8" NPT dynaflow "relief fitting"... It looks a lot like the thing that is already in there.

Anybody know if 1-5 PSI would be about correct? Tempted to see if I can swap the one already in there... Or if anyone else has put a breather in the filler port.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2020 at 3:57pm
Well, it wasn't rusted over but just had grease on it.  Yes, it is some sort of breather, so makes sense where it is located.  Also looked on my 5' snap coupler shredder and found a breather now that I know more of what I'm looking for.  So, the consensus is that these breather plugs should be replaced by the bronze breather plugs from surplus center?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2020 at 12:06pm
I forgot to double check my manual. I'll do that this weekend when I get back over to the tractors. Assuming it's a standard thread and pressure setting? Or else I can just put a breather in the filler neck to the same effect?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2020 at 10:21am
oh, I saw that there but didn't realize it was supposed to be a breather plug, as it is pretty much all rusted over on mine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2020 at 9:42am
The relief fitting as manual calls it is part # 916619. It is in center of top two bolts holes in pics in my manual.Grease fitting for cutter shaft is at bottom. HTH Tracy
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2020 at 8:58am
not sure about that.  Isn't that about the height of the fill to plug on the side?  seems like the breather plug should be higher than that.  I will look again, too, at mine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2020 at 10:41pm
So I think the little circle above the center in the back of the gearbox is the "breather" vent, but I could not get it to pop for me at all. I soaked it down with PB Blaster tonight. Will check it again this weekend, and if nothing else, will soak it again. Maybe it rusted up?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2020 at 7:36pm
It, the grease fitting, is on the bottom on mine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2020 at 5:22pm
I did notice one more thing...  That grease fitting is on the top, on yours, on mine, its on the bottom.  I suspect someone has rotated that rear flange 180º...Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2020 at 3:13pm
I went ahead and ordered the 3/8 NPT breather plug, and figure I may as well fill her up and try it. Unless another breather port seems apparent that is plugged or that I missed?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2020 at 11:15pm
Here's some photos, if anyone wants to point out where they think a breather may already be...

Starting with the "filler" plug side:



Top shot:



Bottom shot:



Drain plug side:



And lastly, one of the rear:


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2020 at 5:15pm
On the top?  I'll have to go out and check again before going and just buying a breather plug, I guess.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2020 at 4:54pm
Originally posted by Dave (NE) Dave (NE) wrote:

I looked at the plug on the 90 degree elbow on mine and it sure looks factory without any breather.  Don't see where there would have been a breather on the gear box when it came out from the factory.

I may have been mistaken on the location, and My memory aint the best, it could have the breather on the top, too...Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2020 at 11:12am
Going to take some pictures today to post later. Measured the plug and it sure does seem like 3/8 NPT, at least.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (NE) Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jun 2020 at 8:41am
I looked at the plug on the 90 degree elbow on mine and it sure looks factory without any breather.  Don't see where there would have been a breather on the gear box when it came out from the factory.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jun 2020 at 11:42pm
Something had to have gotten plugged up somewhere, I just need to figure out where. There must have used to be a breather hole that is now plugged? Check the oil on my deck:


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