Question about Craftsman 1 Hp, 4 Gal. Air Compressor

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Quits pumping at 40 pounds but compressor motor still runs

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Did you unlock the ring around the pressure adjustment knob? turn clockwise all the way and relock.
Good Luck

Posted on Jun 15, 2009


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Could be one of two reasons. If the compressor does not reach full pressure in the tank, you have an air leak somewhere between the tank and the business end of the hose. Run the compressor and use a soap and water solution to find the leak and correct it. Don't forget to check the copper line leading from the compressor motor to the air tank. My compressor would not pump above 45 pounds, and I had to replace the valve body (on top of the cylinder) because a valve had cracked.

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I have a craftsman air compressor model number 921.153101 that won't pump-up over 40 pounds

Its probably a oil less compressor so it could be the reed valves are bad or the piston rings are bad.

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Craftsman 919.152920 air compressor shuts off

If you go to and look up 919.1529 it will take you with a bit of mucking around to a Sears manual close to your model. Do not click on any of the big green download buttons. Click on the smaller blue message download bars. It tells you basically that your compressor has an internal overload which shuts the motor down if it overheats. the reason for overheating can be low voltage but also could be a stuck pump. To check turn off the power and diconnect the ppower cord from the wall. You should be able to turn the motor and pump with the drive belt. If the pump and motor will not move easily remove the drive belt and see if the motor and the pump turn freely on there own. If one or both are tight it will probably be the motor bearings if the motor is tight or the rings in the compressor if the pump is tight. It depends on your level of mechanical experiance as to wether you want to go further. Small 110v or 240v motors are a pain to pull down and the cost to repair are probably not worth it. If someone you know has a clamp tester and a test plug they could measure the amperage draw with the drive belt off and on. The amp draw should not be more than 10 amps even if you have a fiveteen amp circuit. The motor should have a sticker telling you what the amp draw should be. If all this info is getting beyone you I would suggest a visit to a serviceman for a quote.

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DeVilbiss air compressor will not build pressure

Does it have an intake air filter? Has the compressor been properly maintained? Oil less? It may have worn out rings and or valves

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Campbell hausfeild air pump 26 gallon runs for an hour and only produces 40 pounds of pressure what could be the problem

Head valves. Some units use simple metal strips (reed valves) while others are just a bit more complicated. Could be either a broken valve or a stuck valve. The other possibility would be a stuck one way check valve that goes into the tank and keeps the pressure from going back into the pump.

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What tpye of oil goes in the compressor

According to the Owner's Manual, 30 weight compressor oil is recommended. I'd use AMSOIL PCK, even though it's 40 weight. The pump will run cooler, last longer, use less gasoline, and require fewer oil changes. I'd also recommend AMSOIL's AFF 0W-40 Synthetic 4-Stroke Power Sports Oil for the motor for the same reasons.

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Check the pressure switch, they can become stuck in the open position. You can jump it to see if it is functioning or use a multimeter if you have one. Assuming that you've oiled and taken care of it it is unlikely that it simly quit, but that could happen... check across the poles of the motor for continuity which will tell you if the electric motor is blown. ALso make sure the compresor is not seized...

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