Question about Campbell Hausfeld 8GAL Air Compressor

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I plug in my compressor, then I switch it on and it seems to hum, wont turn over or pump air. The air is bleeded out of the tanks... please help me

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Under the black cover there will be 1 or 2 capacitors usually plastic with stud mount sounds like bad capacitor if you have a local motor repair shop they should be able to test it and you can buy them on line

Posted on Apr 04, 2011

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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

Compressor runs fills tank but then it wont keep the pressure, won't restart to keep pressure above requested pressure. I have to let it seat for 1/2 hour to restart again


Most likely problem is the tank fill check valve. The most common way a a tank will loose pressure is by leak-back at the check valve. This also makes it hard to start because it leaves the tank pressure on the pump head instead of letting it bleed off. The motor will only restart after the tank pressure is bleed off to a low level, reducing the back pressure the motor will have to overcome. Leaking can be heard at the pressure switch, where the air is normally bleeds off over 10 seconds or so after the motor turns off. A defective check valve will continuously leak down at the pressure switch unloader valve instead of bleeding out in just 10 seconds. The check valve is an assembly that is largely hidden inside the tank. It just looks like a large hex nut where the filler tube from the pump enters the tank. Removal usually means first removing a smaller hex/barb/connector where the smaller relief line ties into the big nut. Inspection of the check valve will easily reveal whether this is the problem.

Oct 20, 2012 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

My MAC 700 laboured to kick in to build pressure, and then finally quit. It won't turn on with the switch in the


All compressors dump a little air when they shut off, it's the air in the pump head and discharge tube. This bleed off should only last two to three seconds. If this pressure isn't bled off the motor won't be able to restart when the pressure drops in the tank becuase there will be too much pressure in the pump head for it to start turning again. If you have a longer bleed off or if the motor is struggling to restart most likely you have a stuck or broke check valve. It's the piece where the discharge tube connects to the tank. It's designed to let air into the tank but not back out so the pressure valve can bleed off the air in the pump. On rare occasions you can remove it and clean it out but usually they have to be replaced. You would need Makita Part Number 409004-E.

Feb 29, 2012 | Makita MAC700 2 HP Air Compressor "The Hot...

1 Answer

Air compresor Craftsman 921.153101 it spound like is one but it wont run at all. It sounds like the motor is stuck


if its belt driven ,unplug it(safety first)remove the belt and try to turn the pump by hand.if the pump turn plug it back without the belt. and try it .if the motor doesnt run.check the contacts on your pressure switch.if they are ok and try again.if not you need a new motor.if the motor ,the pressure switch contacts,and the pump are fine.put the belt back back on bleed your tank to zero with an air gun and try to run it.if it work well till it cuts of check if your bleeder release air.you might have pressure stuck in your pump.the compressor needs to release pressure for a soft start.hope this help!

Apr 17, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

Compressor initially starts up and fills tank to 120 psi with no problem. Compressor shuts off. When a tool is used the compressor tries to kick back on but hums and won't turn pump. If the "off"...


There is a small valve on the pressure switch that should relieve the pressure between the compressor and tank check valve. Make sure when pressure switch trips, it engages the relief valve and it bleeds the air out. Sometimes the valve itself comes loose and is not engaged by the lever in the pressure switch.

Oct 30, 2010 | Campbell Hausfeld 20 - 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.

Oct 04, 2010 | Dewalt d55151 factory reconditioned emglo...

1 Answer

Portable oiless compressor wont pressurize


If there is pressure at the pump, either:

1) The tank check valve isn't opening (it's located where the line from the head enters the tank - usually extends into the tank, and the the pressure switch unloader line comes off of it as well)
2) The pressure switch unloader is bleeding off the air. This is a small valve on the side of the pressure switch. It should close when the compressor is running and open when the compressor shuts off to bleed off head pressure.

Oct 19, 2009 | Campbell Hausfeld No.FP2028 Gal Pancake...

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

Hitachi twin stack problem.


You stated that the compressor started up fine. I'll assume it reached it's max psi then cut out. Then upon reaching it's cut-in psi the motor ran slowly for a few seconds, then kicked off. I also assume you mean check valve when you refer to the non return valve.
If this sounds about right then. The first thing I would do is bleed out all the air from both the tank and the pump supply line leading from the pump head to the tank's check valve. You can do this by simply loosening the fitting that attaches the line at the head or the check valve. Once done try running the compressor again.
The purpose of this is to check the unloader valve. This valve bleeds off the pressure that remains in the compression cylinder and the supply line up to the check valve. When functioning normaly it will bleed off this pressure once the motor shuts off. If it is not working correctly then when your compressor starts back up (once it is already been filled) the piston will be working against a psi close to the max psi.

If the problem reoccurs only after the compressor has reached it's max psi, then the unloader valve is most likely the problem. If however it will not start up at all even after a complete bleed then it has to be something internal to the pump and\or motor.

Please try this and let me know (or repost) your findings.
If it's the unloader valve I should be able to explain how to repair this valve.
Good luck.

Aug 11, 2009 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

Coleman 5Hp Compresser


All electric compressors share a basic design with ac power pressure switch with unloader and checkvalve between the pump and the tank. When the pressure switch powers off, it unloads the compressor by releasing the air in the discharge hose. You will notice a small tire stem pin and a lever to engage it somewhere on the pressure switch. If the compressor stops before reaching set cutoff point, the air pressure remains in the discharge hose not allowing the motor to start, thus the hum you hear. Solution is to check for the proper function of pressure switch /unloader, tank check valve (if check valve leaks air back to compressor it will load motor causing hum) and extra measure check capacitor for at least 90% of rated valve. Finally, do not run this compressor with an extension cord, use more hose instead. enjoy

Oct 22, 2008 | Coleman CP0302013 20 - Gallon Portable...

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