Question about Craftsman Air Tools & Compressors

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Compressor tamk pressure

Compressor builds the tank pressure up to about 20LBS but will not increase beyond that. There was a smalllpiece of rubber holding the check valve open, but once I cleaned that it stopped losing pressuer.

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That small piece of rubber came from the compressor pump, more than likely you have a broken valve or blown head gasket in the pump, that is why it will not build pressure.

Posted on Feb 02, 2010

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1 Answer

I have a 3 gallon 1HP Craftsman air compressor has worked fine for years but now it won't build air pressure over 20lbs. Any suggestions?


Make sure there are no air leaks first.
Your pressure valve may need resetting or replaced as it could not be working. Your compressor might be wore out.
Is there a gizmo that you can turn to set pressure. if so that might not be working if you have tried to set it.

Sep 09, 2014 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

Compressor runs and sounds ok, but it only manages to show 20 lbs. It will not build air pressure and continues to run.


check air tank drain valve located on bottom of tank, if it is not leaking try adjusting air pres regulator (large black knob close to air hose connection.) the knob when turned in will increase the tank air pressure, if knob wont turn check that lock ring on bottom of knob to make sure it is disengaged. also check for air leaks in all lines and connections

Apr 16, 2012 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

Compressor squeaks as pressure begins to build. Not from belt. Does not squeak when no pressure in tank.


Air leaking back from tank check valve or leaking reed valves can make a squeaking or vibrating noise. With pressure in tank remove fitting at the tank check valve and test for leak with soapy water. If leaking, replace with generic valve. If no leak, reinstall fitting and let all the air out of the tank. With empty tank and air filter removed, start compressor and feel strength of suction at intake. When you hear the squeak retest strength of suction at intake and compare. If reed valves are leaking, you will feel less suction as tank pressure increases, and in severe leaking valves, you will actually feel air blowing out of intake. Repair/replace reeds and /or leaking gaskets in head of compressor. Good luck

Mar 08, 2011 | Ingersoll Rand IngersollRand SS3F2GM...

1 Answer

My Craftsman air compressor has wored fine till now. It does not want to build up pressure beyond 50 psi.yes I did check the drain valve and no leaks. Motor seems to be putting out the rpm's and the oil...


Check for a leak between you compressor head (pump) and your tank. Your pump output may be good but as your tank pressure gets higher the leak will not allow the tank to build up.

Feb 04, 2011 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

1 hp 3gal craftsman compressor will only build up to 20lbs pressure in tank. how much compression should single cyl have on compression stroke?


A piston in any engine should be around 100 psi I would guess. A Chevy 350 used to be around 150 psi. An air compressor that only pumps enough air to reach 20psi is obviously too low on compression. Nailers and the like need 80 or more psi. The intake valves may be shot, the unloader might be stuck or piston rings are worn.

Dec 08, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Pressure loss


Does the tank have a serious air leak? If it looks like it is centered around the compressor, remove the cylinder head. Check and clean the intake and outlet valves. Check the safety valve on the tank that it is not leaking. Listen everywhere for a hiss while it is running. Make sure the belt isn't slipping.

Jul 16, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Compressor will run but wont build more than 20lbs of air


LOOK FOR AIR LEAKS-ALSO HIGH PRESSURE CUTOFF SWITCH MAY NEED
ADJUSTMENT.

Jun 20, 2009 | Air Tools & Compressors

1 Answer

Tank will not build pressure beyond 25 lbs. Just runs


IS YOUR AIR FILTER CLOGGED. 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. SEE IF YOUR FINGER WILL GET SUCKED UP TO THE INTAKE HOLE.

Apr 12, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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