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Anonymous Posted on Jan 01, 2008

Craftsman Air Compressor

My craftsman air compressor will only pump to 40/45 psi and it takes several minutes for this even. The pump broke and I feel the reason was due to extended running and never pressuring up to full psi to shut off. I have rebuilt the pump and feel like it is ok now. Any Suggestions?

  • 3 more comments 
  • leegresh Jul 22, 2008

    Craftsman 1hp 4 gal model no# 921.166380

    will run to 125psi one time. After I use it one time it will not go back to 125psi it will only go to 25psi and then shut down (This is Brand new)

  • Anonymous Jul 26, 2008

    My craftsman 1hp model# 921-153100 Starts and builds pressure to 125lbs, after I blow the pressure down it starts up and goes to about 35lbs and shuts off. Cylinder head is hot. Possible running capacitor 40uf??. Checked with Sears they want too much to repair, I paid $99.00 for it.

  • Anonymous Aug 01, 2008

    HAVE THE SAME PROBLEM BUT MINE WILL PUMP UP TO 60 PSI

  • Anonymous Aug 08, 2008

    I HAVE AT CRAFTSMAN 30 GAL AIR COMPRESSOR... IT PUMPS UP TO 40 TO 45 PSI AND WONT GO ANY HIGHER.. THE TUBE THAT GOES TO THE TANK FROM THE ON OFF SWITCH ARRANGEMENT GETS WARM AND EVEN HOT TO THE TOUCH... WOULD APPRECIATE ANY INFO ON REPAIRING IT... THANKS

  • misstrooper Sep 15, 2008

    I have a 1.5 horsepower 15 gallon air upright air compressor. It comes on and runs fine, but it will only pump up to 30 lbs of pressure. I have replaced the pressure swith and cleaned the check valve. Still no luck. I need help. Of course it is only one year old, but still out of warranty.

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  • Posted on Jan 01, 2008
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May need to check the adjustment on presure relief valve on tank or check pop off valve on the top of the pump head.there may be some debree stuck in valve.

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Related Questions:

0helpful
1answer

I have a 3 gal craftsman air compressor. Compressor runs but will not build more than 20 psi in tank reserve. Whats wrong?

if shuts down at 20 psi regulator is set wrong
it runs but only builds 20 psi, compressor is probably worn out
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My sears air compressor model 919.156781 will not pump up past 40 psi , then motor then compressor stalls and motor gets hot , have to unplug . I have had the motor checked

When it gets to 40 psi turn it off and see if you hear air leaking down from somewhere....if so listen and feel around the edges of the compressor head. If you hear or feel air leaking there you may need to replace a head gasket.
1helpful
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Why won't it pump up past 40#?

If you don't have any air leaks, the cylinder head gasket is probably bad on the pump. Easy fix for less than $10. you can get the parts you need here:
http://www.mastertoolrepair.com/sears-craftsman-919195411-p-48270.html or ebay.com. For around $50 you can get the whole rebuild kit.
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12 gal 2hp instruction manual

You didn't give your model number so here's a possibility: If it's vibrating that much it's usually a good indicator the air pump connecting rod is broke. If it's been in storage it's possible the oil evaporated enough or it didn't have enough in it that it didn't lubricate the con-rod bearings. It would have started the first time but as heat built up in the bearing areas it could have seized up when it was shut off or broke when it tried to restart. You'll have to take the air pump apart to verify what's broke and what's damaged and what has to be replaced. Most Craftsman parts are only available through Sears (www.searspartsdirect.com).
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I have a 25 gal. craftsman oilless air compressor. Runs for about 1/2 a minute & than kicks the breaker out.

Hello babeaton, several things can cause that, but, the most common thing is the regulator. let it run again and right ofter it kicks off feel the power cord and see if it's warm to the touch, if so it likely is the regulator. Breakers operate based on the amount of heat generated from current running through the cord/wires.
Good luck my friend!
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1 hp 3gal craftsman compressor will only build up to 20lbs pressure in tank. how much compression should single cyl have on compression stroke?

A piston in any engine should be around 100 psi I would guess. A Chevy 350 used to be around 150 psi. An air compressor that only pumps enough air to reach 20psi is obviously too low on compression. Nailers and the like need 80 or more psi. The intake valves may be shot, the unloader might be stuck or piston rings are worn.
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Air compressor won't go over 40 psi?

my ace air compressor which is 26 gallon 5 hp will not get over 60psi what is wrong with it please?
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Broken cog on compressor motor 919.166440

Below is a link where they have a variety of parts for smaller craftsman compressors.
I didn't see an exact match for your model however I think if you contact them they will probably be able to help you out. I'm sure that motor/pump model was used on several different models.
Hope it helps.


http://www.mastertoolrepair.com/craftsman-sears-parts-portable-compressors-c-271_535_537.html

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Psi will not go above 40 psi tank presuure will not go above 20ps

chech air filters for restrictions if not compressor internal parts worn!!!Good Luck to You!!!!
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