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I HAVE A SEARS 1 HP SINGLE CYLINDER THAT USES REEDS IN THE CYLINDER HEAD, IT RUNS BUT DOESN,T BUILD PRESSURE. EVERYTHING LOOKS OK ON THE INSIDE

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Sounds like th reed valve is either broken or stuck, not a big job also make sure all is very clean

Posted on May 11, 2010

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I own a Campbell Hausfeld model WL650800AJ compressor, the problem is that the compressor will not pressurize over about 85 psi..where would be the best place to start troubleshooting?..BTW, there is


The usual problem with oil-less type compressor is the Teflon compression ring and cylinder will fail causing the problem that you describe. Easy to check. With cover removed, turn the pump until the piston is all the way up. With good light, check the condition of the cylinder near the top. If the cylinder looks scratched, air is leaking past cylinder and ring and pressure will not build up enough to reach cut-out. If cylinder looks smooth, then problem is head valve reeds or head gaskets. Indication of bad reeds or head gasket blown, is extremely hot head during fill cycle. Good luck

Dec 07, 2014 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Will not build pressure


If your compressor is oil-less type, most likely pressure is leaking past piston ring. To verify, remove cover to expose bottom of cylinder (unplug compressor and let out all air). With flashlight, examine the upper-most part of the cylinder (turn motor by hand till piston is at top of stroke). If top of cylinder is scratched, then pressure is leaking past. If cylinder looks good, most likely problem with reedvalves or broken gasket in pump head. Parts are not too expensive for most small compressors. If your compressor is oil lube type, problem sure to be in the head assuming no leaks. Good luck

Oct 24, 2012 | 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

The compressor runs but the pressure will only build to approx twenty pounds and the compressor keeps running. I have used it many times before and had the discharge regulator set to approx 45 pounds, and...


You have either a broken reed valve on the valve plate or a broken piston ring and/or badly scored cylinder. To check: remove the head on the air pump, the valve plate is directly under the head. The reeds have to be in good condition, no breaks, cracks or bending, to work properly. If they are OK, check the cylinder, it should be very smooth. You will have to remove the piston to check the ring around it. They have a tendency to dry out and sometimes a small section will flip over backwards and will no longer seal the piston enough to compress the air. You'll have to contact Sears to see if parts are still available for this compressor.

Feb 11, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Will not build pressure past 40 psi


You have either damaged reed valves or piston ring. Both of which are common problems with this type of compressor. To diagnose: Remove the motor cover, then the four screws holding the cylinder head on. The valve plate is under the head and all eight reeds, five intake and three output, must be in very good condition to work properly. You'll need the valve plate, part number N017592, and head gasket, part number Z-D24819, if there are any damaged reed valves. If they're OK, check the piston ring. Remove the screw holding the piston on the flywheel and pull the con-rod out of the cylinder. The ring around the piston must be in perfect condition to build pressure. The connecting rod kit, part number KK-4964, is the only way to get the piston seal ring.

Jan 17, 2011 | Porter Cable C2002 150 Psi 6 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.

Dec 14, 2010 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

My 1 hp. 12 gal. air compressor is not building air pressure the motor runs the pressure won't go above 20 lb.


It could be that the input air filter is badly clogged. I might more likely be that the Non-return valve on the air tank input is not sealing properly and not allowing the tank to build up pressure. This valve is at the end of the main pipe runs between the compressor and tank. It could also mean (less likely) that the poppet valves inside the compressor cylinder head are not sealing properly. Other faults could be worn rings on the compressor pistons or a bad seal between the compressor cylinder head and block.

To check the Non return valve allow compressor to build up some pressure and then loosen union nut on Non return valve. There should be some air released at first but should stop if valve is ok. If leaking remove valve and check for dirt and clean. If valve still leaks replacement is the only fix.

Sep 14, 2010 | Craftsman Air Tools & Compressors

1 Answer

My compressor runs but is not filling the tank. Sears wants more to repair it that it will cost to replace.


Take the exhaust tube from the compressor and run it for a moment or two with your finger over the exhaust port--it should try to blow your finger away. If no pressure, remove the cylinder head from the compressor and inspect the valves in the head assembly. Reeds or discs, if any are cracked or broken, replace same from: Seardpartsdirect.com Make sure the valve seats are in good condition--if not, you may need to replace the cylinder head from the same source. Make sure the piston(s) move up and down when turning the compressor pulley. Inspect the piston top(s) and cylinder wall(s) for excess wear or other damage. The only other problem would be a hissing leak from some tank component. Hope this helps!

Aug 17, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

Air blowing out the intake


Cylinder head has two ports, intake (clean air coming in) and exhaust (air going into tank). Problem with my Sears compressor was the gasket that separates the two ports was blown. This causes exhaust to come out the intake port. Blown gasket may be a result of adding to much oil. Disconnect power supply, remove cylinder head, order or make new gasket, and reinstall. Connect power supply and watch the pressure build. My first attempt with home made gasket material allowed the pressure in the tank to build. Air was coming out the side of the cylinder head. Going to NAPA to buy the correct gasket material since Sears don't seem to sell the cylinder gasket anymore through Sears Parts. Good Luck

Aug 22, 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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