Question about Craftsman Air Tools & Compressors

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I have a VERY OLD Craftsman Air Compressor. I believe it is a 20 gallon 220 volt 2 hp. electric motor. The model number on the side of the compressor (2pistons) unit is 265-104. I don't have any problems with it so this should be an easy question for you. It works very well and holds 120 PSI for weeks without a leak. My question is what is the proper oil capacity for this unit?

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I've been working on air compressors for a while now and so far haven't found any that give a specific amount of oil to put in the air pump crank case. They all have one of two methods to get the oil to the proper level. First, and my favorite, is a sight glass at the bottom of the crank case. About the size of a quarter, it lets you see how much oil is in the pump as you add it. Usually they have a red center dot which is where you want the oil level. A little over or under is OK but the sight glass should not be completely full or completely empty, both are hard on the pump and drive motor. Another method is a dip stick usually on the end of the fill hole cap. Only bad thing about these is you have to put in some oil, check the oil level with the dip stick, then add more oil and check it with the dip stick until you get to the full mark. Again, not over and only a little under is where you want the oil level.

Posted on Mar 18, 2011

  • byrnes0923 Mar 22, 2011

    Positivly, 12oz. I have the same PNm265104 and the drain/fill plugs limits fluid level to 12oz. I flushed mine 3 times and drained each time in a measuring cup. 12oz consistant!

  • David Dennis Jun 11, 2012

    Thank You (very belated) as my computer was down for some time. Unfortunately someone in a flash of brilliance replaced the sight glass with a freeze plug. I bought it used, it seems very happy with one quart. I do wonder if I could get a sight glass for it?

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Drain and then pour 16 FL Ounces of non-detergent SAE-20 oil into the crankcase. Compressor oil from your hardware store is usually fine, but try to find a synthetic, it will last for years before needing changed. DO NOT USE ANY DETERGENT OIL IN THIS PUMP, IT WILL EVENTUALLY RUIN IT!!!

That is an awesome old pump you have there and parts are unbelievably still available for it. Take care of it, keep the filter clean and it will easily last another 25+ years! Most that usually happens with that pump is the reed valves may need changed.

Posted on May 02, 2015

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Do you know what the model number is for your compressor?

Posted on Dec 11, 2014

Testimonial: "265-104"

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Posted on Jan 02, 2017

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