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Take a look at the contacts in the pressure switch. They may be burnt or pitted and both legs of power are not making contact at the same time. I had this happen both on an air compressor and a well pump.</div>
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Brian</div>
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Nampa, ID</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Shop-talk <shop-talk-bounces@autox.team.net> on behalf of John T. Blair <jblair1948@cox.net><br>
<b>Sent:</b> Tuesday, August 10, 2021 7:23 AM<br>
<b>To:</b> shop-talk@autox.team.net <shop-talk@autox.team.net><br>
<b>Subject:</b> [Shop-talk] Compressor woos</font>
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Hey gang,<br>
<br>
I have a Craftsman 5 hp 30 gal compressor that I purchased some time<br>
around '90. Here are the particulars:<br>
<br>
Compressor: Model 919.176951<br>
MO-6436<br>
<br>
Motor: GE Model 5KCR48SR59W<br>
Part #: C-MO 3013<br>
RPM: 3450<br>
Volt: 230<br>
Amp: 13.1A<br>
Shaft size: 5/8" or 16mm<br>
<br>
SCFM @ 40 PSI 11.3<br>
90 PSI 9.3<br>
125 PSI 8.0<br>
<br>
Cut In pressure - 100<br>
Cut Out pressure - 125<br>
<br>
The other day I was using my nail gun putting up molding around a window<br>
in my family room. All of a sudden the nail gun quit nailing. After checking<br>
the nail gun and not finding anything obviously wrong with it, I went down<br>
into the shop to see if the compressor was on or if I had inadvertently<br>
turned it off (old age, I forget what I just did). Anyway, the switch on the<br>
compressor was in the ON position, but there was only about 40 psi in the<br>
tank. I pulled the compressor's plug and stuck in the 220V recepticle, and<br>
was getting a reading of 0V on both legs. So I go to the circuit breaker<br>
panel and reset the breaker, nothing. So for some reason the breaker has<br>
bit the dirt. I pull the breaker and head off the hardware store for a new<br>
breaker. Put it in and the compressor fires back up, and I finish putting the<br>
trim on the window.<br>
<br>
Well the next day, I needed the compressor so I turned it on, and I was<br>
working around the shop. The compressor came up to pressure and shut<br>
off. After using the air to clean off the filter on my shop vac, the<br>
compressor went to cut on, but it didn't start. I could hear a humming. I<br>
run over the the compressor, but before I can turn it off, it trips the new<br>
breaker. I pull the saftey shield and try to turn the flywheel to see if the<br>
compressor/motor has frozen. It moved easily, so both compressor and<br>
motor were OK. I turn the compressor back on, and it fires up. After a few<br>
cycles, I hear the humming again. Again, but the time I can get to it, it<br>
has tripped the breaker. So there is something wrong with the motor.<br>
<br>
Anyone have any ideas? I was thinking that it is either a bad spot on the<br>
armature, or a bad start capacitor. If it's the capacitor, why would it start<br>
after I moved the position of the motor a few degrees?<br>
<br>
I check with a local shop and they want $200 to put it on their bench! I<br>
think that's a little steep. So I guess I'll open it up and shot gun the start<br>
capacitor. Is there anything else I should l for while I'm in there?<br>
<br>
I do plan on cleaning all the parts while it's apart. I also don't <br>
see any place<br>
to oil the motor. So I'm assuming that it has bearings that are lubricated for<br>
live. Or is there something I should do there, oil, grease?<br>
<br>
TIA<br>
<br>
John<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
John T. Blair WA4OHZ email: jblair1948@cox.net<br>
Va. Beach, Va Phone: (757) 495-8229<br>
<br>
48 TR1800 48 #4 Midget 65 Morgan 4/4 Series V (B1106)<br>
75 Bricklin SV1 (#0887) 77 Spitfire 71 Saab Sonett III<br>
65 Rambler Classic<br>
<br>
Morgan: <a href="http://www.team.net/morgan">www.team.net/morgan</a><br>
Bricklin: <a href="http://www.bricklin.org">www.bricklin.org</a><br>
<br>
If you can read this - Thank a teacher!<br>
If you are reading it in English - Thank a Vet!!<br>
<br>
From Dennis Prager - The American Trilogy:<br>
e pluribus Unum, "from many, one."<br>
In God We Trust<br>
Liberty - the power of choosing, thinking, and acting for<br>
oneself; freedom from control or restriction<br>
<br>
<br>
<br>
<br>
-- <br>
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