Question about Craftsman Air Tools & Compressors

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I have an upright craftsman compressor which is VERY slow at building pressure. The shut off is 150psi. When I use the unit, and it turns on, it runs forever to build back up, even when im not using it. When it is running I feel air discharging out of the top forward cylinder(i think intake, where filter is) It does ultimately build back up, but might take 20 minutes after turning on, even if not in use . Any thoughts appreciated, Thanks

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Your unit should fill within 5 min. Compressor may have worn cylinder (assuming oil-less) , worn valves or just leaking. Easy test. Spray soapy water on all connections/fittings including drain valve and regulator while compressor is running. Repair as needed. If no leaks, remove plug from outlet, remove cover and examine cylinder. Turn crank by hand till piston is all the way up into cylinder. Examine carefully the condition of the cylinder close to top. If the cylinder is scratched or worn then pressure is leaking between piston/cylinder and will not fill tank properly. Replacement cylinder kit available at Sears, cost under $50. If no leaks and the cylinder looks good, then valve plate may have broken gasket or reed valves. Replace as needed. Good luck with your project.

Posted on Aug 25, 2010

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Sears craftsman air compressor model 919.153160 will pump to 150psi but is leaking when it is pumping it will shut off at 150psi but then struggles to restart (tries several times before it does start).


Loosing line a little bit going into tank and see it the pressure continues to come out if so, you might want to consider replacing the check valve. It is designed to keep the pressures in the tank and when they leak off it causes back pressure on the motor making it hard to restart...hope that helps.

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Pressure switch - replace as soon as possible
Overpressure would be possible in that tank - it is dangerous !

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1 Answer

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I can not find a Craftsman compressor with that model number anywhere so here are a couple things to look into. If the compressor fills to 70psi and keeps on running check the valve plate and piston/cylinder assemblies. Check that the valve reeds on the valve plate are not bent, broken or warped from heat. Then check that the wiper (oil less) or pistion rings (oil splash) are not damaged and that the cylinder wall is not scarred up. Any of these will let the compressor fill up to the point where the air pressure leaks past the valves or piston and won't fill any further. If the compressor fills to 70psi then shuts off the problem is in the pressure switch. Some have an adjustment screw or bolt to control when it turns on and shuts off. If you had a drop from 100 to 70 the springs may be weak or broke and you'll have to replace the switch.

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Hello
Could be a bad pressure control switch.

Depending on the size of the compressor it should shut down on high pressure via a pressure switch.Some will shut down at 150psi.

Also there should be a relief valve,make sure this is also working.

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1 Answer

Craftsman 6hp 150psi 30gal won't keep running


It sounds like the internal circuit breaker in the motor is heating up and then the breaker trips to shut down the motor. This is the protection so you don't have a fire if the motor burns up. The smell you have is the coils in the motor. Sorry to say that you will need a new motor for this unit. I hope this helps out.

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