Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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Craftsmen air compressor #919.155730-motor runs,pump moves, but doesn't build pressure. how long does it take? could I not be waiting long enough?

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Your unit should fill within 5 min. Compressor may have worn cylinder or just leaking. Easy test. Spray soapy water on all connections/fittings including drain valve and regulator while compressor is running. Repair as needed. If no leaks, remove plug from outlet, remove cover and examing cylinder. Turn crank by hand till piston is all the way up into cylinder. Examing carefully the condition of the cylinder close to top. If the cylinder is scratched or worn then pressure is leaking between piston/cylinder and will not fill tank. Replace cylinder kit available at Sears, cost under $50. Good luck with your project.

Posted on Aug 07, 2010

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If you have oil-less type of compressor you may be leaking pressure past cylinder/piston ring or just air leak. Easy to check. Spray soapy water on all connections, first with pressure in tank and motor shut off, then once again with motor running/pumping. Repair as needed. If no leaks remove cover to motor and move piston to top of cylinder and examine condition. If you see scratches neer top of cylinder, then pressure is leaking past vinyl ring. If cylinder looks shiny and smooth and piston vinyl seal looks intact, suspect problem with reed valves or head gaskets. Parts are avilable at sears parts on the web. Good holidays expensive.

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I have a 5 gal, i hp craftsmen compressor, 3 years old, used once a year to blow down sprinkler system. Compressor ran up to 120 lbs upon turn on, would not cycle off. manually shut off unit and turned...


Oil free pumps do tend to blow the piston ring (not too expensive) available at searsparts.com. Remove covers to pump and manually turn crank until piston is at top and look at the condition of the cylinder neer top, If it looks scratched, order cylinder kit with piston ring. If it looks good and shiney, could be the valve plate in the head. There are reed valves that tend to break. Run pump however with covers removed and check with soapy water for air leaks and repair as needed (air leaks under the cover will prevent unit from filling). Good luck

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My craftsmen air compressor wont build pressure. How do i fix it?


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Without the model number of the compressor this is about as far as I can help with.

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Will not build up pressure


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Have a husky 19 gal 1.5hp it kicks on when first start to work and when it builds up air and i use it and when it wants to kick back on it wont i have to wait till it cools down.


Is there an option for you to run this compressor on 220 volts vs 110 volts??? If so, you may want to convert it by following the re-wire instructions on the motor or wire access plate/instuction book. The reason your compressor won't fire up again after building pressure is the head pressure is to great at restart and 110 household current is not enough to give the power needed to turn the piston. You'll need to replace the plug and have someone run a 220 volt circuit once the conversion is completed.

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1 Answer

My compressor doesn't build enough pessure.


SOUNDS LIKE THE VALVES IN YOUR HEAD ARE NOT CLOSING ALL THE WAY. THEY ARE MOST LIKELY REED VALVES, THIN STRIPS OF METAL THAT OPEN AND CLOSE WHEN THE PISTON MOVES. MAKE SURE THEY ARE CLOSING ALL THE WAY (NOT CARBONED UP). DID YOU REMOVE THE HEAD AND DID YOU PUT BACK LIKE YOU FOUND IT. NOT TURNED OR FLIPPED OVER.

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