Question about Craftsman Air Tools & Compressors

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Craftsman air compressor 2 hp 20 gallon, seems to running o.k. builds up to 100lbs shuts off when it hits 80lbs come back on, but when i run a tool , right around 90lbs the tool dies out and runs week.when it kicks on at 80lbs the pressure builds up but the tool still runs slow.

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IT depends on the tool. Some tools require higher cfm. (cubic feet per minute) of air. IF your air line is not large enough, then sometimes 90psi is not enough to operate a tool as there is a pressure drop at the tool. Look at the required cfm for each tool. Find a chart for air line size, cfm and pressure. Most impact wrenches should be used on a minimum 3/8" air hose. You could look at your manual and see what the max pressure is on your compressor. You may be able to decrease the differential pressure e.g off and 100 and on at 90, but then the compressor will cycle more frequently, and may exceed the duty rating of the compressor.

Posted on Oct 02, 2010

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Posted on Jan 02, 2017

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I just bought a craftsman pneumatic 1/2-in drive impact wrench. And used it with my craftsman 4-gallon 1hp air compressor tried to loosen the bolts on my car wheel wouldn't loosen them help


Pneumatic tools are rated in cfm (cubic feet per minute). Your 1 HP air compressor is rated at probably not more than 3 cfm while the 1/2 " impact driver needs at least 8 cfm, maybe 12 chm of air.
The compressor must provide more chm than tool rating needs.
It is a problem, by the time you look at five horse power air compressors and larger, a lot of electric power is needed. A circuit of 220 volts, 20, 30, or more amps would be required to run those large expensive compressors.
If you can, return the air tool and get a good electric tool instead.
Leave those high air volume air tools to shops that are so equipped to use, or invest if you must.

Jul 24, 2017 | Craftsman Air Tools & Compressors

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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

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?


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.

Mar 01, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

I have a craftsman model 919.165300 compressor 5 hp 30 gallon.It runs it builds pressure and shuts off like its suppose to. The problem is when I attach my impact wrench to the airline and press the...


first I hope that you drain the water out of the tank regularly. It seems as though you might have an air hose collapsing but in any case there is something apparently restricting air flow too the gun. try opening the petcock and see if you have steady air discharge or not and if you have another air hose try it. Also, are coming directly off the compressor to the tool or do you have an oiler or drier in line? if so, eliminate the accessory. Let me know how you do....I'm curious.

Feb 17, 2011 | Craftsman Air Tools & Compressors

1 Answer

Air pressure does not go over 25 psi I have taken the whole unit apart and check, relief valve,regulator,check valve. Pressure switch, Piston & Gasket. everything seem good I have taken the pressure...


Does it shut off at 25 psi or just keep running and never build more pressure than that? Also, did this come on gradually or suddenly? Also, was it being used regularly when it happened or had it been sitting for a while?

Mar 07, 2010 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

Compressor will not build pressure


It sounds like it is not getting enough electricity.
Try plugging in to an outlet on its own circuit without an extension cord. make sure the circuit is rated for your air compressor. If it is on a circuit with other appliances, refrigerator, lights, ect. try shutting them all off before turning on the air compressor.


Good luck

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

2 Answers

Craftsman compressor runs for 10 sec. and shuts off.


I have a Craftsman 2hp/12 gallon Air compressor that does basicly the same thing, will start, run for about 3 seconds and stop. I replaced the pressure switch but still have the problem. Any suggestions?

Apr 08, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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