Too much oil - damaged the compressor?

by Larry
(Illinois)

I have a Craftsman 12 gallon 125 PSI 1 HP portable air compressor.


Last fall I changed the oil in it. Like an idiot i didn't read the manual first and overfilled it. After sitting all winter I fired it up to do some work around the house. After using it a few times I started noticing the odor of oil burning coming from the compressor.

Now it will only build to 40 lbs. of pressure but keeps running with no increase in pressure. When I drained the tank I notice the water was mixed with oil.

When I turned the compressor off it did not bleed down so no leaks. Did I break it for good? What do I do? Thanks.
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Larry, offhand, I would guess that you have damaged the piston seals at least, since you have lube oil mixed with water in the tank.

All oil lubed compressors wick oil into the tank with the compressed air. However, it shouldn't be too much, and if you are seeing it, then I suspect that the sump oil has forced its way past the piston seals, then down the line into the tank.

See the troubleshooting page about compressors that run and don't build pressure for more info.

Cheers,

Bill

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Aug 16, 2012
RE:
by: Anonymous

Hi Bill. Just wanted to give you an update. I changed both gaskets and the compressor seems to be working fine. Build up to the shutoff point and stops and no bleeding off. Thanks.
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Thank you for that.

B.

Aug 14, 2012
Thanks
by: Anonymous

Thanks Bill for your opinion. Would it be worth it to rebuild it?
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If the cost of parts is not prohibitive, and you do the work yourself, probably. If you have to use a repair depot, hmmmm, what is this compressor worth new, $150 - $200 or so.

Whether it is worth it, then, is up to you.

B.


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Oil coming out pump oil fill vent

My compressor 60 gallon upright is only 2 years old don't use it very much.

I was using it the other day blowing out a hay baler and when I got done there was oil blowing out the oil filler vent.

I have not change the oil yet and the oil level is fine.

I have never had any trouble before also the pump and motor was pretty warm but never shutoff due to overheating.
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Typically this scenario can be caused by overfill of the oil sump and vibration is splashing oil up and out the fill vent.

Since you haven't filled the oil recently, another reason this will occur is that your piston seals are leaking air, it gets past them down into the sump, the sump is vented to allow air to escape, and the escaping air is taking oil with it.

You mention that you were using the compressor to blow out a hay bailer. Did you move the compressor to get it to where you used it?

If the oil sump is full, moving the compressor could have allowed excess oil to migrate into the fill tube, and then, vibration could be splashing oil out.

It depends on how much oil.

Cheers,

Bill

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What kind of oil to use in a xpusa 17.5 com 145 psi

Don't know what type of oil to use on this air compressor type
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As I note on the oil page, if your compressor pump is new, you should use the oil that is recommended by the manufacturer. Using other oil might void your warranty.

If you cannot locate your manual, and the store you purchases this twin-cylinder reciprocating pump cannot provide the lubricating oil recommendation for this pump, then if it were mine, I would purchase air compressor lubricating oil from the compressor store.

I would not use automotive or other types of oil.

Bill

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Which is better pressure lubrication or splash lubrication

by omar
(chicago)

I am looking at two different 60 gallon single stage compressors, one says splash lubrication and the other says pressure lubrication. They are almost equal in the specifications.
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Omar, the people that designed the compressor determined which is the best method to lubricate theirs. If they have determined that splash lube works well for their model, that's what they'll pick over pressure lubrication, as the latter involves a pump and more complex filter system for oil.

If the warranty for the two compressors is the same, and the size suits your compressed air needs, and if you can get spare parts for your compressor for when it fails, then I would pick the simplest one, and that's the splash lube.

Just my .02 worth.

Bill

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