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

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Check valve i have a 921 craftsman compressor 3.2 hp 60 gal and i keeps damaging the check valve, i replace two already and they get stuck

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I have replaced countless checkvalves that were stuck open due to debris produced/ejected by the compressor. Most frequent problem was carbon deposits due to wrong type of oil in compessor. The carbon deposits form inside head and discharge hose. All carbon must be cleaned from head and hose when new checkvalve is installed. Use synthetic oil in compressor to prevent carbon deposit. Leaky valves and gaskets in the pump will also casue problems because this greatly increases the air temp discharged from the compressor. I use checkvalves pruchased from and not the sears valve. Good Luck

Posted on Jan 14, 2009


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What kind of oil do i need for a craftman 1 hp 3 gal 125 psi compressor m/ n 921 153101?..

For warm climate, use 30wt non detergent oil (lowest price $3). Med priced oil ($5), use compessor oil sold at Lowes or any major center store including Wal Mart. Compressor oil is special blend for higher temperature range (continuous use). High price oil, synthetic compressor oil works for heavy duty use under severe conditions (also sold at major lumber centers, cost about $8~18).
For lite duty, any oil that you have handy will work fine (check oil before every use). Good luck

Oct 03, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

A/C will only pump 30-40 lbs, but keeps running.

Maybe your unloader valve is stuck or damaged. This is found in the switch assembly and if it is faulty you should be able to hear a constant hissing noise from the switch .

Jun 05, 2010 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

Air Compressor builds to 60lbs and no higher, does not shut off

the valve plate or the piston damage
wear and tear
take it apart and check
when installing use gasket maker to seal it back

Aug 03, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Leaks air at the pressure switch

start your compressor and let it buid up pressure to turn off. then unplug from power.lossen the fill tube that goes from the pump to the tank. when you loosen it. if it leaks air then your check valve is bad and will have to be replaced.

Dec 25, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Compressor will not pressurize

A simple check to see of the compressor is pumping is to remove the intake air filter and feel for suction. If the pump is working properly you will feel suction at the intake and the compressor will unload (speed up) when you restrict the opening. If no suction remove the head and valve plate and check the piston and reed valves for damage. Replace parts as needed. Parts are not expensive for small compressors. Good luck, enjoy.

Dec 19, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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