My Craftsman air compressor doesn't shut off...

by Stefan
(Edmonds WA)

Hi, my name is Stefan from Edmonds, WA. I would really appreciate your advice on what i can do about my air compressor. I don't have much knowledge about air compressors but I will try to write everything that I know about my compressor in particular.


It runs just fine when I turn it on and gives me enough pressure and after about 10 minutes of work, the pressure is weaker and at the same time it doesn't shut off unless I shut it off manually.

It has 2 gauges that show PSI's. The first one which is next to the switch goes up to 100 PSIs and stops there and the second one which is where the hose goes out, goes up to 60 PSIs and stops there and it keeps running without giving me the same pressure. Here are the compressor's specs:

1. Craftsmen 1 stage,33 gal. oil-free compressor.
2. Model #: 919.167320
3. Serial #: 2516188188
4. Max RPM: 3450
5. Displacement: 11.9 CFM
6. Pump #: D27348
7. 120V/15A/60 HZ/ 1PH
8. 6 Horse Power max/ 2 HP running.
9. 150 PSI max.

Please let me know if there's any more info that you need, to be able to understand the problem. Thank you much.

____________________
Bill says...

Hello Stefan.

I think your first gauge is your tank gauge, and it depicts the pressure that your compressor has pumped into your tank.

Your second gauge is on your regulator, and it tells you what pressure that you have set the regulator to. If you aren't sure what the regulator does, please read the page on Regulators linked from the nav bar.

Here is what I think is happening.

Your compressor has a problem, and can only pump enough air into your tank to get that tank pressure up to the 100 PSI you say it goes to.

Since your pressure switch is normally set at higher than that pressure, maybe 12-150 PSI, since the pressure in your tank never gets to that cut out pressure your pressure switch can't shut off the compressor.

Your compressor problem may be an intake valve (check and see if air is huffing out of the intake port instead of just being pulled in), or it may be a gasket failure (seems likely to me, as your compressor builds pressure, and when it hits a certain level, the pressure opens the gasket and leaks air).

Please read the page linked from Troubleshooting about all the reasons why a compressor won't build pressure.

Cheers,

Bill



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Mar 18, 2011
Thanks
by: Stefan

Thank you Bill, I will look into it. I appreciate your help!!

_______________
You are most welcome, I'm sure!

B.

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919.155730 I need the specfications on the start and run capacitors for this 3.5hp compressor

by Ed
(Temple, GA)

need dimensions, mfa, and volts for capacitors so I can replace.
___________________
Ed, this model is still supported by Sears.

Visit: www.searspartsdirect.com

Drop your model number into the search box, and you'll get parts and availability information.

Cheers,

Bill

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