<div dir="ltr">A couple observations from working on air compressors & shop air systems:<div><br><div>1) the pressure relief valves are often (not always) stamped with the pressure they are supposed to pop off at, which is normally higher than the cutout setting on the pressure switch and lower than the tank rating. YMMV</div><div><br></div><div>2) I suspect (as have others here) that the pump probably has too many miles on it and is having trouble developing the last bit of pressure to reach the cutout setting. I have picked up a few "broken" compressors for a song over the years that wouldn't shut off. A quick easy "fix" to get them back working is to adjust the cutout setting down a few psi until it functions again. This is a 'band-aid" fix for a worn out pump but it will usually buy you some more run time on an old machine. I'd explore this option first. Most of the time I need air, I don't need the full psi the compressor was built for.</div><div><br></div><div>3) don't always trust the gauge on the compressor. Many big box store machines use cheap gauges that are fairly inaccurate, sometimes to the tune of 5-10 psi. I have a high end glycerine-filled stainless-body 200 psi gauge installed into a tee-fitting that I keep in my toolbox along with a handful of adapters to use to work on air systems. I trust it, and it often reads differently than the ones that come on compressors, especially lower end units.</div><div><br></div><div>Mark Greer</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Dec 7, 2021 at 3:23 PM Jim Becker <<a href="mailto:mr.jebecker@gmail.com">mr.jebecker@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>If it was intended to operate up to 135#, as the giant label on the tank
indicates, the relief valve won’t be anywhere near release pressure at
135#. It probably trips at something more like 165# (just a guess).
In any case, if it is running forever at close to 135# and not building more
pressure, the problem has nothing to do with the relief valve. I would run
through some of the checks others have suggested (oil level, clean intake
filter, sticky parts inside pressure switch, etc.). If running through
those checks doesn’t solve the problem, I’d assume that wear is making it
hard/impossible to reach 135#. Then adjust it down to about 120# cut-out
pressure. Run it that way and let the heirs decide on final
disposition.</div>
<div> </div>
<div>Back to your original question, take the cover off the switch (1 or 2
screws hold it). Look inside. Instructions for setting the pressure
are often on a sticker on the cover or molded directly into the cover.
There are usually 2 adjustments. One is the cut-out pressure (or maybe
cut-in) while the other is often a setting for the DIFFERENCE between cut-in and
cut-out. Keep track of how much you turn them. If things get worse,
you will know how far to turn things to get back to where you started.</div>
<div> </div>
<div>Jim Becker</div>
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<div><b>From:</b> <a title="deanvp@att.net">deanvp@att.net</a> </div>
<div><b>Sent:</b> Monday, December 06, 2021 10:57 PM</div>
<div><b>To:</b> <a title="at@lists.antique-tractor.com">'Antique Tractor Email
Discussion Group'</a> </div>
<div><b>Subject:</b> [AT] Air compressor failure</div></div></div>
<div> </div></div>
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<p class="MsoNormal"><span style="color:windowtext"><u></u><u></u></span> </p>
<p class="MsoNormal"><span style="color:windowtext">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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext"><u></u><u></u></span> </p>
<div>
<p class="MsoNormal"><span style="color:windowtext">Dean VP<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext">Snohomish, WA
98290<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext">"Socialism is a philosophy of
failure, the creed of ignorance, and gospel of envy, its inherent virtue is the
equal sharing of misery."<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext">..Winston
Churchill...<u></u><u></u></span></p></div></div>
<p>
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