[AT] Air compressor failure

Roger Moffat rogerkiwi at gmail.com
Tue Dec 7 09:17:14 PST 2021 

The problem with this theory is that if the compressor is turning on OK, but not turning off, or at least turning off after a longer than normal time, then either:

1 - the compressor itself is weak/damaged/worn out and not able to generate the 125psi that the switch is set to
2 - the compressor is not being told to shut off, so the pressure is rising and rising and rising past the switch’s set point to a pressure at which the relief valve should let go.

1 seems the more likely scenario - it’s just taking longer to get to 125psi as the compressor has aged and worn.

Roger

> On Dec 7, 2021, at 11:58 AM, Spencer Yost <spencer at rdfarms.com> wrote:
> 
> I have the exact opposite problem (but probably same root cause)  with my water well pressure switch.  Every once in a blue moon it will fail to cut the pump on when the pressure drops below it’s rated psi. All I have to do is cut the power, run a little emery cloth over the points, and then all is well for another long while.  
> 
> PS:  Cut the power first! 
> 
> Spencer
> 
> Sent from my iPhone
> 
>> On Dec 7, 2021, at 9:39 AM, deanvp at att.net wrote:
>> The over pressure release valve does work when pulled manually  but is not releasing by itself up to 135 lbs pressure,   I don't yet know when it is supposed to automatically release.   I'm going to check a few things that you folks have asked about and see if any are contributing such as low compressor oil, plugged intake filter or a leaking outlet line and see what happens. Thanks for the suggestions.
>> 
>> 
>> Dean VP
>> Snohomish, WA 98290
>> "Socialism is a philosophy of failure, the creed of ignorance, and gospel of envy, its inherent virtue is the equal sharing of misery."
>> ..Winston Churchill...
>> 
>> -----Original Message-----
>> From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Henry Miller
>> Sent: Tuesday, December 7, 2021 5:17 AM
>> To: at at lists.antique-tractor.com
>> Subject: Re: [AT] Air compressor failure
>> 
>> Many large compressors like that pump up to 170psi.  Can you find a label someplace? 
>> 
>> Does the overpressure release valve release air when pulled, that is your backup in case the switch fails, if it works just let it run a little longer. 
>> 
>> --
>> Henry Miller
>> hank at millerfarm.com
>> 
>> On Mon, Dec 6, 2021, at 22:57, deanvp at att.net wrote:
>>> Need some help relative to a Husky 60 gallon , 7 HP air compressor.  I 
>>> am shop sitting the shop in AZ of my recently deceased friend until 
>>> his three sons can decide what they are going to do with the 10 
>>> tractors, 5 highly modified garden tractors and a fully stocked shop 
>>> with a huge quantity of hand tools.  In return for doing the shop 
>>> sitting I get to use the shop to do the work on my 1935 JD B and JD Garden Tractor.
>>> Upon the very first entry I noticed the air compressor was running too 
>>> long. I shut the breaker off and am not trying to figure out of there 
>>> is something I can do to fix it. My first thought is the pressure
>>> switch isn’t working right.   But….   I have never worked on this 
>>> version. Attached is the picture of the air compressor. I have not yet 
>>> found a operators manual or service manual to guide me through some 
>>> trouble shooting.  I am pretty sure this was working at least up to 
>>> the end of August and then my friend got confined to the house due to
>>> illness  and eventually died October 6.   I arrived in the middle of 
>>> November to take first use of the shop again.  So the compressor sat 
>>> unused for at least  couple months which may have something to do with 
>>> it not working now.  It does pump up to 135 lbs pressure but does not
>>> shut off.  I set my compressor at home to shit off at 120 PSI.   So 
>>> 135PSI seems high to me.   If I open the pressure switch is there some 
>>> adjustments in there or is it maybe just stuck that needs to be 
>>> unstuck?    Anyone with experience with this brand of air compressor?  
>>> I don’t want to create more expense because I don’t know what I am 
>>> doing.   Here is a picture. Note: The red dial on top of the pressure 
>>> control does work in that it shuts down the compressor when moved to 
>>> the Off position. When moved to the Auto position it just continues 
>>> running.
>>> 
>>> 
>>> 
>>> Dean VP
>>> 
>>> Snohomish, WA 98290
>>> 
>>> "Socialism is a philosophy of failure, the creed of ignorance, and 
>>> gospel of envy, its inherent virtue is the equal sharing of misery."
>>> 
>>> ..Winston Churchill...
>>> 
>>> 
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>>> AT at lists.antique-tractor.com
>>> http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com
>>> 
>>> Attachments:
>>> * 20211206_152017a.jpg
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