Question about Craftsman 1 Hp, 4 Gal. Air Compressor

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My Craftsman air compressor is locked up. When you turn the switch on it just makes a humming noise and thw motor will not come on.

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1. While the compressor is unplugged, see if you can turn the motor freely with a screwdriver or something to determine that the motor is not jammed 2. If there is a removable cover, check to see if the brushes are worn, (replace if needed). 3. There is also a relay that tells the motor to start located near the pressure adjustment. If this relay is defective or the contacts are burnt, you may need to replace the relay. Good Luck!

Posted on Nov 15, 2010

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Bought new 7 gallon 1HP horizontal craftsman compressor. Used first day worked great . Second day plug it up hit on switch and all it does is click when you cut it on and make a humming sound


does it have oil? take it back for a replaement. pull the belt off and see if the motor is still good. turn the pump by hand to check for free turning.

Apr 22, 2015 | Craftsman Air Tools & Compressors

3 Answers

My compressor comes on for a few second, makes a slight humming sound, then goes silent; any suggestions?


Please realize I'm not a professional compressor repairman.

Your description "comes on for a few second, makes a slight humming sound, then goes silent" leaves me guessing. When you say "comes on" does that mean it "makes the pumping sound of a compressor" or it "Clicks"? Allow my musings.

On a plugged in and turned on compressor the compressor's pressure switch turns on the pump motor when the pressure falls below it's set low pressure threshold (usually ~ 90 psi). The pumps pushes air into the pressure tank until the pressure reaches its high pressure threshold (usually ~ 120 psi). If the compressor is not plugged in or turned on you can hear a click when the pressure switch turns on.

Aside: Leaks, of any sort, make the pumping more frequent or longer. Bad leaks can make it pump continuous because the high pressure threshold is never reached. The leaks can be in the switch, at line connections or in the pump (valves or piston rings) itself.

I once had a low-volume ultra-quiet compressor that made little more noise than a hum when compressing. If yours is not an ultra-quiet (clicks on, hums, and quits) than I'd have to guess that the pump might be binding instead of pumping. If it is binding then the motor would over-heats and shuts off.

Some compressors are oil cooled. If an oil cooled compressor was extremely low on oil would it bind? I suspect so.

If you suspect binding I'd find a parts list for your model to work from and disassemble the pump to investigate. (see link below)

That's my best guess on limited information. Good luck.

Campbell Hausfeld Air Compressor Parts

Jan 16, 2015 | Campbell Hausfeld Extreme Contractor...

1 Answer

I have a 33 gal craftsman compressor when I turn on the relay switch hums but the motor doesn't spin?


I would check the capacitor since it appears that the motor is not locked up. Here is a how to on testing capacitors;


how-to-check-capacitor

May 16, 2012 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

HAS POWER , BUT SEEMS TO BE LOCKED UP. The sound that it makes is a hum and no air in or out


The electric motor may have seized up from moisture or contamination. Make sure all air has been released by opening a valve or fitting.Disconnect the compressor from its power source, (Tape the power cord plug to compressor handle for extra safety) Remove motor cover, try to rotate the motor with a screw driver using just a little pressure.If the motor has brushes, make sure they are in contact and do not need replacement. Check to see if the motor has lubrication points. If so us a little WD40 or other oil based product.Place cover back on motor. Plug unit in to power source. If the unit still 'hums' turn switch off. I believe this compressor is oil less.If so the motor and compressor may be connected as a unit.If the compressor itself is froze up you may be able to separate the two and try freeing any frozen parts, again making sure the unit is disconnected.If the compressor does not respond to the suggestions given consider replacement if out of warranty.Good luck!

Mar 05, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

WHEN I PLUG IN MY COMPRESSOR, IT JUST MAKES A HUMMING NOISE. THE LIGHTS IN THE AREA GO DIM ALSO.


one of three thing possible, the start capacitor on the motor is no good, the start switch inside the motor is faulty, or the motor and or pump is locked up. if you do not have the test equipment to check it out I would advise finding a motor repair shop.

Mar 03, 2010 | Coleman Air Tools & Compressors

1 Answer

My central Pheumatic air compressor oiless


Sound like the fly wheel is loose or belt is the same

Mar 13, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

Sears Craftsman 3-Gallon, 1.5 HP Air Compressor Hums


YES IT MAY BE THE CAPACITOR . IT COULD ALSO BE THE WIREING IN THE MTR, THE PUNP ITSELF.

Nov 10, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

The fan for my air conditioner will not turn. When we cut the system on it makes a humming sound and the light go dim for just a moment and this goes on repeatedly. No heat or air. We have a dual...


If the humming noise is coming from the attic it would indicate that the blower motor on the air handler is trying to start but the rotor is locked.

If the humming noise is coming from the outside unit and the fan runs but the compressor does not your compressor has a locked rotor.

If the blower motor is the problem the outside unit should still start as normal but you would have no cooling due to no air movement.

In ether case it sounds like you need to call a service tech to diagnose your system.

May 03, 2008 | Heating & Cooling

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