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

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My compressor will not go over 20 psi i have a craftsman 921 4 gal 125 psi compressor and it will not build past 20 psi i do not know how to get to the pistons and stuff what do i do?

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The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.

Posted on Mar 02, 2011

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Posted on Jan 02, 2017

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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

Oct 03, 2015 | Craftsman Air Tools & Compressors

1 Answer

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,...

1 Answer

WILL NOT BUILD UP AIR PRESSURE PAST 20 LBS.


Check to see if air is leaking past 'pressure relief' valve. It's probably leaking and that's where all the air is going.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Sep 11, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Pressure is not building up past 25 psi


ONLY TWO THINGS CAUSE THIS, A DEFECTIVE PRESSURE CONTROL VALVE OR A WORN OUT COMPRESSOR, THIS ASSUMES YOU HAVE NO LEAKS.

Aug 04, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Compressor shuts off before reaching max pressure


Yes,but if the max is 125 you don't want to increase it above 110 and set off the pressure relief valve.

Jul 21, 2009 | Craftsman 1 Hp, 4 Gal. Air Compressor

4 Answers

Lack of pressure


My air compressor builds up to 40 psi and just keeps running, i have a craftsman 5 GAL, 1HP, 125 PSI and pressure goes up to 40 psi and dose not go any higher and on the other hand engine keeps running and dose not stop. Please advise?
Thanks.
Kia

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

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