Compressor purred like a new kitten, it was not pumping any air

by Bob
(West Virginia)

Hi Bill, My son directed me to your site.(Bob, your son is wise beyond his years! :-) B. ) Hope you can help me.


I have a Charge Air Pro 3/4 HP Air Compressor that is 20 - 25 years old at least. I think it is a Ingersaul Rand product. There is a number die stamped on the side: 97179469. This may be the SN. All this compressor was ever used for was to inflate tires.

While this compressor is small with a one hand carry handle it is very heavy - around 40 lbs. The pressure adjusting knob is rated from : Start up to 100 PSI.

While it was still working but somewhat neglected and dirty, missing a "threaded plug" (?) above the "oil level sight glass" and a missing "nut" that was suspose to be holding an electrical looking capacitor(?) which was now laying loose (still connected) on top of the motor, I decided to clean and repair it replacing the hose and adding new quick disconnect fittings and the "missing plug".

In order to re-bolt the capacitor back in proper position, I had to remove the top of the aluminum head(?) 4 - nuts, lifting this top off from the aluminum housing exposing the "piston chamber".
Once repaired, this housing was replaced. I also removed the oil drain plug, draining the old oil, replacing it with new "Air Compressor Oil" from Ace Hardware.

Proud of myself for restoring this "old faithful Air Compressor to almost new condition" I plugged it in and turned it on. While it purred like a new kitten, it was not pumping any air, in fact when placing my thumb over the end of the hose it felt like it was faintly sucking air. I quickly turned it off.

What did I do wrong? Any advice?
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Bob, you say "when placing my thumb over the end of the hose it felt like it was faintly sucking air. I quickly turned it off. " That doesn't sound good. What hose? Are you talking about an air line to an air tool? Are you saying that there was, instead of air blowing out of the air hose, you think it was pulling it in?

If that is so then what I suspect has happened is that you have somehow inverted the valve plate so that, as the piston cycles, the compressor is trying to push air out of the intake part, and pull air in from the air hose?

Do I describe correctly what is happening? Do you recall removing and replacing a valve plate when you "fixed it" :-)?

Please post more info as a comment here so I can follow our conversation.

Cheers,

Bill





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Sep 09, 2012
Valve plate inverted
by: Bob

Bill, you were right, when replacing the valve plate I had inverted it. I removed the head this morning and corrected the position of the valve plate. It seems to be working just fine now. Thanks a lot.

However, I am still concerned about the purpose of the "empty" threaded female connection on the top side of my compressor above the oil level bubble sight gauge. It doesn't seem to affect the operation of the compressor pumping air through the air hose as well as pumping air out of this connection. I assumed that this was the oil fill port and that a solid threaded plug was "missing".
Is this correct?

Thanks again.
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You are welcome Bob. Glad I guessed right!

And, I think you are correct in your surmise that this is the oil fill port. I also suspect that it is missing the vented plug. If you just insert a solid plug, eventually you will have problems with the compressor operation. Have a look at some of the oil fill ports on other compressors at your local store, and emulate what they have. See the photo on this page: www.about-air-compressors.com/compressor-oil-change2.html for a typical oil fill port plug.

Cheers,

Bill

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Pump is running, but no air coming out?

by philip
(uk)

Pump is running, but no air comeing out.

my freind took the head off and cleaned the valves, they were in a state. he said piston and rings are fine. i ave had it for some years, do i nee to change valves,the oil is old,hould i change the oil to?
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Hi Philip... as noted on the Compressor Oil pages on this site, you change the oil in the compressor similarly to the regular oil changes you would make in your car.

You would not drive the car year after year without changing the oil and filter. It isn't a sensible action then to run the air compressor year after year without changing the oil.

Regarding no air coming out, are you saying that the compressor motor is running, the pump is pumping, but there is no pressure rise in the tank?

Please add a comment here so I can follow the discussion to help figure out what is happening with your air compressor.

Cheers,

Bill

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Compressor gauge not moving no pressure

by Lou
(Niagra on the lake ontario canada)

I turn on the compressor, it is running, however the compressor guage does not increase at all?
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Lou, what make of compressor? What model of compressor? New? Older and used up?

Your compressor likely has two gauges. See the page on air gauges (left side navigation bar) for complete gauge information.

Post more details as a comment here.

Bill

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Jan 30, 2014
Air compressor guage not working
by: Anonymous

No reading at all, staying at zero.
I do not have the manual on the compressor.
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When you search for your model- I used this string - (HDX (Home Depot MOdel) TAW0412P) you end up on a page at Home Depot with the compressor you say looks like yours. You download the manual from there.

"No reading at all, staying at zero." When you say this, do you mean that both gauges show zero? If so, turn the knob on the regulator until that gauge reads 90 PSI, then you'll know which one is the regulator gauge and which is the tank gauge.


Jan 29, 2014
Pressure problem
by: Anonymous

Hi
It has two gages. HDX (Home Depot MOdel) TAW0412P.
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What is the pressure reading on the two gauges, please.

And did you read the pages about air gauges and air regulators?

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magnum air compressor portable 4hp 15 gallon no building air

by Sam Miller
(Palos Hills, IL )

I replaced the gasket but I forgot the order the reeds and the plates go. I tried an arrangement and air was blowing out of the intake , and it looks like it is pumping air in tank but the air pressure that feeds the tank is not really strong, I am not sure if I had the order of the reeds and plates put right. I appreciate comments
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Well Sam, pain in the neck it will be, I suspect that you're going to have to go back into the pump and reverse the valve plate.

If you have air pumping out the intake valve, and the valve itself isn't broken, then the valve orientation is backwards.

Cheers,

Bill

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