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Jun air model 4-15 power light on humming but no motor cutting in. relays click to switch motor on but nothing happens,

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Output haft on motor may may have loosened or rod fell off.

Posted on Feb 25, 2009

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My kobalt 80 gallon air compressor won't turn on

BE CAREFUL! Jump the pressure switch and see if it starts. If so, replace the switch. If it doesn't start but hums, cut the power and try to turn the compressor by hand. Free it up if possible. If it does not hum, look for a reset on the motor or a blown fuse or breaker.

Dec 14, 2013 | Kobalt 5.2 HP 80-Gallon 175 PSI Electric...

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;


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

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Air compressor will not restart at cut in pressure. i have removed line from head and found no backpressure but motor will start every time. replaced switch with new unloader valve, still have same...

the start windings are probly burnt. does it hum when it his cut in. i had one the same. u bleed it down to nothing and it would start but slow. once its up to speed the motor switch snaps and u go to the other set of wires in the motor. it will work good till it cuts out. like u said no back pressure at the head. but wont anyway. well if u try to start it its not long and the short pipe to the check valve builds up if u start from empty the check valve can open and let the air out while it slowly speeds up if this sounds like ur problem then u need a new motor i had one i took apart and the start windings, the thinker shorter ones, were stuck together because the clear insulation melted together. i spit them apart using a screwdriver and gooped them up with that liquid black tape. put it together and nothing. found out i broke one. so i twisted it together good and put it all together again and pluged it in. it still works today. it was just a temp fix but i figure untill it stops working again im not going to replace it.

Nov 18, 2010 | Air & Gas Compressors

2 Answers

My cambell hausfeld , model WL650001AJ won`t come on . Have power to and through ths switch . Motor hooked direct to power and no start . Any thoughts ?

Check for a reset switch on the motor or air pump. They're usually located on the edge of the motor housing sometimes partially hidden by the air shroud around the air pump. It's usually a white button about the size of a pencil eraser with a two digit number in the middle of it. If it's sticking out of its housing push it in to reset it.

Oct 14, 2010 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

Hi what happens is i turn on the compessor it hums only then the thermal cutout cuts out after 10 seconds or so i turn off reset thermal cut and try again same thing happen thank in advance

you may be drawing too much current thru cord causing relay to trip, plug compressor cord directly into 20 amp circuit. As these tools get older and used the motor windings get hotter. Try pumping up with no pressure in tank and tank bleed valve open. I have experienced this dozens of times with many makes of small to mid-sized compressors.

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1 Answer

Need a point setting for ao smith air compressor ac motor model number opa-0297 s# c56b72b2316508j2 work on air machine with motor installed motor will hum and trip breaker can we set points to stop trip...

There is not a point setting for air compressors. The pressure switch can be adjusted. Remove the cover from the pressure switch. Adjust the nut tighter for a higher cut off pressure or looser for a lower cut off pressure. It sounds like the compressor is trying tostart under load. If the unloader valve is not working, the compressor will draw excess amperage and do what you describe. The unloader valve releases the pressure in the cylinder at the end of the run cycle so the compressor can start the next run cycle under no load.

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I have a Maverick Ajax air compressor. I was

drain the air from the air receiver, and see if it switches on again

Oct 25, 2009 | Air & Gas Compressors

3 Answers

Unit was running and shut off. Now motor won't run. Seems to get initial click and then a hum.

Try trouble shooting it in this order
1. remove the v-belt connecting the motor and compressor
2. run the motor, if it runs well then check the compressor. try to turn the flywheel of the compressor by hand. if it turns alright then check the pressure switch.
3. check the setting of the pressure switch, it cuts off power to the motor when the preset pressure is reached, maybe it is set too low, adjust the pressure switch to a higher setting

Oct 18, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Breaker relay tripping out

If the unloading valve trips , which i think is the safety valve that tells me the compressor is pumping up past its maximum allowed pressure. that black switch should be the overload switch. check the amps of the wires going to the motor while its running and then look at the name plate of the motor to see the maximum amount of amps that the motor is allowed to draw.

Mar 31, 2009 | Ingersoll Rand Type 30 Electric Driven Two...

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Sears Craftsman 3-Gallon, 1.5 HP Air Compressor Hums


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

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