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Craftsman 7 gal compressor. pressure builds to

Craftsman 7 gal compressor. pressure builds to 30lbs and then air comes back out intake, and no further build up...

Have checked reed valves and torqued head, and problem repeated

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Maybe the non return vale is stuck or damaged.

Posted on Jun 06, 2010

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Will only build air to 35 lb .keeps running but no air above 35lb


Most likely it is a leaking valve. If ether the intake or exhaust valve, but not both, leak back pressure will be low. These small compressors usually use reed valves. Try and remove the head, and check that the reeds are not bent up, and that the seat it seals against is not cut. If the reads are bent you can sometimes flip them over. You may be able to get new reads from Sears if they are bent or broken.

May 07, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

Compressor will run but not build pressure. Air is coming out of compressor inlet filter. What could be my problem


You have a broken reed valve(s) in the pump. Without knowing your model number I don't know if it's repairable nor can I recommend a replacement part. If the head is removable, take it off and check the valve plate under it. There should be two or more reeds on each side. If they are chipped or broken or warped from heat they won't seal the valve holes and the system can't build pressure.

Jan 05, 2011 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

3gal craftsman horizontal compressor wont build pressure


Without knowing specifics of your unit, If there are three reeds, then two are probably for intake and one for exhaust. Intake reeds should be on the piston side of the valve plate, discharge reed should be on the head side.

There should be a divider in the head side to separate the inlet from the discharge. Make sure the valve plate is turned so that the air from the air filter side goes to the side with the intake valves, and the air from the discharge valve should go to the side with the pipe to the tank.

Oct 21, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

I have a craftsman 1hp 4 gal compresor. It's not building pressure and air is pumping out of the air filter not in???


sounds like reed valves are bad,sometimes you can take the reed valves and flip them over for short fix,best to put new one in unit.

Jun 27, 2009 | Craftsman 1 Hp, 4 Gal. Air Compressor

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,...

1 Answer

WILL NOT BUILD PRESSURE


Many craftsman compressor are built by champbell hausfeld using a dry type of cylinder and piston (no oil, no crankcase). If dry type, check for worn cylinder and piston ring. Pieces of the vinyl ring can jamb between the reed valves in the head causing air to escape from the intake. If your compressor has a crankcase and oil, check for broken reed valves in head. Spray soap solution on hoses, checkvalve, drainvalve, and fittings to check for leaks. Most likely problem is reed valves broken or open. Parts are available from sears or match parts to chpower.com. enjoy

Nov 26, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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