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<p>Hi JohnnyB,</p>
<p><br>
</p>
<p>Well, I have to say that your description of the symptoms and the course of actions you already have taken are terrific. I also will say that you have done everything I would have tried as well. Just a great job diagnosing and working through the problem.</p>
<p><br>
</p>
<p>Because you have done such a great job so far, I am only guessing now, but perhaps it is a loose bore/worn pistons binding as the pressure builds, or some obstruction.</p>
<p><br>
</p>
<p>My thinking here is that as the pressure builds, the increased friction in the bore causes the motor to load more than normal and results in the increased current draw.</p>
<p><br>
</p>
<p>The fact that the belt starts to slip would seem to indicate that there simply is too much resistance in the pump, and if it is not the bearings, it almost has to be the pistons or else some obstruction.</p>
<p><br>
</p>
<p>Great write-up, nonetheless.</p>
<p><br>
</p>
<p>best,</p>
<p><br>
</p>
<p>des</p>
<br>
<br>
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<div id="x_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 johnny b <johnnybh@windstream.net><br>
<b>Sent:</b> Friday, December 23, 2016 5:27 PM<br>
<b>To:</b> shop-talk@autox.team.net<br>
<b>Subject:</b> [Shop-talk] air compressor problem</font>
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<font size="2"><span style="font-size:10pt;">
<div class="PlainText">Season’s Greetings to one and all.<br>
<br>
After all of these years of listening, I now have a request from the <br>
back bench.<br>
<br>
I have an air compressor problem.<br>
<br>
The compressor is an Ingersoll Rand SS5N5, which is a single stage, two <br>
cylinder, 5hp electric driven compressor unit on an 80 gallon vertical <br>
tank. It is rated at 135 psi max., 18.1 cfm @ 90 psi.<br>
<br>
I use it in a home shop, mostly light duty.Some weeks, it doesn’t run at <br>
all.<br>
<br>
Originally, I noticed that occasionally the compressor would not come up <br>
to speed on a restart after tank pressure dropped.When this happened I <br>
could turn it off and wait a while, then turned it back on and it would <br>
run normally.In the last month or two, it has gotten to where the <br>
compressor would run normally only on the first startup of the day.After <br>
that, it wouldn’t come up to speed.<br>
<br>
Today, I started working on it.<br>
<br>
I started the compressor with an empty tank.Air temperature in the shop <br>
was about 60 degrees.<br>
<br>
Pump rpm was 990:motor was drawing about 14 amps (I’m using a Craftsman <br>
clamp on type meter).<br>
<br>
At about 60 psi, rpm had dropped to 960, and amps increased to 20; motor <br>
was noticeably working harder.<br>
<br>
At 100 psi, rpm was at 870 and amps were at 22.5.<br>
<br>
At 120 psi, rpm was about 800 and amps were at 23.5.At this point the <br>
belt was beginning to slip so I turned the compressor off.Data plate <br>
rating for this motor is 22 amps.<br>
<br>
I immediately removed the tube from the compressor head to the check <br>
valve and restarted the compressor.<br>
<br>
With no load, rpm was 1001 and amp draw was 13.It ran this way for <br>
several minutes with no sign of problems.<br>
<br>
The temperature at the bearings on both the motor and the pump was 80-85 <br>
degrees.<br>
<br>
The motor was replaced in June with a comparable new unit.The pressure <br>
switch assembly was replaced at the same time.The oil was changed about <br>
2 months ago.It has always used IR Synthetic Compressor Oil.<br>
<br>
Today, I removed the check valve and it was clean and operated <br>
freely.The unloader valve sounds as if it is working correctly.<br>
<br>
So, what else can I check?<br>
<br>
Thanks for listening,<br>
<br>
johnnyb<br>
<br>
<br>
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