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

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Air wont built in tank, motor runs fine

I have the craftsman 3 lb tank and I took the cover off and the reeds are fine. They are not broke and the tank still wont built air. any other thoughts?

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As the pump is running try spraying all the fittings with soapy water and look for bubbles. Hope this helps. Good luck.

Posted on Jul 23, 2009

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Do you hear any air pressure coming from the unit at all? if so where?

Posted on Jul 25, 2009

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Posted on Jan 02, 2017

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1 Answer

Craftsman Air Comp. 6 hp oil-less, 33 gal horz. tank - sounds really loud


Sources of noise from craftsman oil free compressors (could be Made by Campbell Hausfeld or Porter Cable) include loose fan, failing bearing/s on the piston rod and housing, failing seal ring on piston, air filter intake and loose motor mounts. With the housing cover off, check the fan blade for cracks or loose screw. Turn motor by hand till the piston is at top of stroke. Examine the cylinder for scratches close to top. If scratched, air is leaking past vinyl ring making noise and causing longer fill time. If everything looks ok, suspect noise coming from bearings. Hard to tell if bearings are failing by looking at them. I have seen many failures of the piston bearing on the crank (fairly easy to change, I use alternator bearing from auto parts ) , however, the bearing in the housing just behind the crank bearing is much harder to replacable. Good luck with your fix-it project.

Jun 11, 2012 | Craftsman Air Tools & Compressors

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My Sears Mod. #919.155730 ran for 2 mins. (cold 40*) made loud noise, then started vibrating bad, and stopped building up pressure. Intake is sucking air, but coming out of the little valve oppsite si


pull the heads and check for failed reed/poppet valves
check for a blocked non-return valve at the tank indicates a blockage between the compressor pistons and the receiver tank

Jun 21, 2017 | Craftsman Air Tools & Compressors

1 Answer

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 only builds to 20 lb pressure. Line to tank gets hot.


Very hot air is an indication of leaking /broken head gasket or reed valve. Before you remove any parts, with compressor running, check all fittings for leaks with soapy water. If no leaks, remove head and examine parts. If reed valve is broken replace as needed or do creative repair. Some valve plates have multiple reeds and only one reed is broken. Depending on your skill level, you can thread the hole and seal with piece of bolt (finished repair must not be any thicker than the plate). Good luck

Jan 29, 2011 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

Wont build pressure past 60 psi


If you have oil-less type of compressor you may be leaking pressure past cylinder/piston ring or just air leak. Easy to check. Spray soapy water on all connections, first with pressure in tank and motor shut off, then once again with motor running/pumping. Repair as needed. If no leaks remove cover to motor and move piston to top of cylinder and examine condition. If you see scratches neer top of cylinder, then pressure is leaking past vinyl ring. If cylinder looks shiny and smooth and piston vinyl seal looks intact, suspect problem with reed valves or head gaskets. Parts are avilable at sears parts on the web. Good holidays expensive.

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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

Craftsman 1 gallon direct drive oil filled wont build air pressure


It sounds like you may have a broken reed on the diaphragm plate. This is located at the block. Remove the cover, and look for a cast metal assembly with fins. It will be attached to the side.

Apr 18, 2009 | Air Tools & Compressors

1 Answer

Motor run for ever but tank does not fill up with air.


Sounds like you broke a valve. You could take apart the head assembly and check the reed valves but I would check to see if parts are available before you do this. Craftsman compressors are not the easiest compressors to find parts for.

Mar 31, 2009 | Craftsman Air Tools & Compressors

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