Question about Campbell Hausfeld WL6502 5-Hp 20-gallon Oiless Air Compressor

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My air compressor will start when the air line is disconnected, but drags and the thermal overloads trip out the motor when the line is connected. I replaced the check valve already.

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  • Craig Butler
    Craig Butler May 11, 2010

    What pressure is it running up to? It may be trying to over-pressure and this can trip the motor. Also, the motor could have a bad bearing.

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  • 75 Answers

Did ya check the capacitor on the motor?

Posted on Jun 27, 2009

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1 Answer

My compressor comes on for a few seconds, makes a slight humming sound, then quits altogether; any suggestions?


The only thing I can think of is that something is DRAGGING or binding, which "overloads" the motor, and thus causes the thermal overload safety switch [inside the motor] to "open" thus PROTECTING the motor from overheat damage.

The only fix for this is to find, AND ELIMINATE, the drag or bind!!!!!

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

1 Answer

When I plegged the compressor in the motor turned slow, then stopped. I small puff of smoke came from the motor.


If it does not have an external reset switch, it will have a built in thermal overload that trips and should reset itself when it cools down. If this is an oil type, make sure the compressor is full of oil.

Mar 02, 2011 | Stanley NEW Bostitch 2 HP 6 Gallon...

1 Answer

Air compressor starts fine,but trips the thermal reset ,motor seems hot. It does it in every receptacal I've tried.


With no air in the tank and amp meter connected to one leg of line, start compressor and note amp draw thru cycle. It should draw low amps at first then reach rated amp draw close to end of cycle(most likely 12-15 amps). If amp draw is normal then replace thermal breaker. Older compressors have thermal breaker incorporated within winding and may not be easily replaced (but not impossible). If amp draw is higher than rated, check capacitor for proper rating and make sure that the in-tank check valve is not leaking pressure back to pump. Good holidays

Dec 29, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

I have a ingersol compresor model 2475 everytime it builds up and cuts off we haft to go out to it and push the blue reset button on the electric box thats mounted to it to get it to restart once u push...


Jamie It sounds like you have a check valve thats bad or possibly high amps causing the over load to trip. If its a check vale you should have air blowing from the copper line that attaches to the pressure switch. Also you can disconnect the tube at the hp head. If its blowing air the check valves needs replacing. Now if the over load is tripping you will need to check the amp draw with an amp meter. A 7.5 hp motor should be pulling approximately 35 to 40 amps if its single phase 230 volt. if not depending on voltage the amps will be less. Pull the disconnect before Removing the starter box cover. Find the bottom of the overload where the motor leads connect. just above will be some metal strips that have a number like E68 on them. There will also be a sticker in the starter box cover that will have numbers like E68 and a corresponding amp range. Your max amp draw should correspond to the amp range in the cover. If amps are out (higher) of range you need to install larger heaters in the overload. Ex. you May need E69 or E70 overload heaters instead of E68 heaters. Hope this helps you

Dec 27, 2010 | Ingersoll Rand 2340/2475 Electric Air...

1 Answer

HAVE A SSR-XH60 SCREW COMPRESSOR WITH 39180419 INTELLISYS CONTROL KIT AND IT SHOWS "STARTER FAULT" WHAT THIS MESSAGE MEANS?


The motor starter overload auxiliary contact is wired into the intellisys control unit. If the motor would overload, then the thermal overloads in the motor starter will trip. When this occurs you will get that message. The overloads are in the electric panel on the left side. You will have to remove the screws to gain access. Be sure to have disconnect off when removing cover. There is a reset button on the motor starter you can press to reset. Now the question is why did it trip? There are a few common possibilities. On is dirt in the coil not allowing enough air to pass over the motor. Slipping belt generating too much heat. Old or low oil causing high temperatures. Pressure setting set higher than unit is designed. You can set pressure on the intellisys. Another reason is short cycling. If you have this set for start stop operation by pressure, the minimum run time should be at least 10 min, and I believe mfg recommends even longer. If it starts and stops too frequently, the motor will overheat.I hope this helps. (I maintain a very similar unit where I work) These units are usually very trouble free units if you keep the oil, oil filter, air filter, and separator changed as recommended.

Oct 19, 2010 | Ingersoll Rand Stationary Air Cooled...

1 Answer

Pump humms and barely turns. Fan blade caught wire caused huge spark. wire has been replaced.pump does not really seem to get going and trips safety after a minute of running.


hi there!
short circuited at start damage motor compressor
if you have a service center for motor compressor have checked this one, motor compressor has thermal overload protection mostly on single phase motor inside the motor,in the absence of overload protector the winding of motor on start and running maybe shor circuited.this should be rewind by motor rewinder.check the cost of motor rewind to a brand new motor.have choose n it.have a nice day fix my rate.

May 07, 2010 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers

My compessor wont start.


ALWAYS USE LARGE GAUGE CORDS FOR COMPRESSORS. LOOK FOR RESET BUTTONS OR THERMAL OVERLOAD BUTTON ON MOTOR. DID IT TRIP BREAKER OR GFI OUTLET?

Feb 15, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Motor will not start


I had the same problem and the solution was to manually press the thermal overload button. The button is located under the tool box next the motor head. I do not believe I tripped the thermal overload during use, but I suppose anything is possible. I’ve been using the compressor in sub 40 deg F. temperatures. I found the following in the Owner’s Manual, but had to look at the part manual to locate the switch.
MOTOR THERMAL OVERLOAD
PROTECTOR: The electric motor
has a manual thermal overload
protector. If the motor overheats
for any reason, the thermal
overload protector will shut off
the motor. Turn pressure switch
to the “off” position and wait for
unit to cool before pushing the
reset button and restarting the
compressor.

Good Luck!

Dec 14, 2008 | Makita MAC5200 Electric Powered Air...

1 Answer

I recently had a new outdoor unit installed on my central heat and air conditioning sytem. I have had the installer out 3 times and the system still does not operate correctly. Sometimes when it cycles...


It sounds like the compressor needs starting components installed on it. All a/c units have a run capacitor for the compressor and another one for the condenser fan motor. These motors use these capacitors all the time when the motor is running. However, in some cases, this capacitor isn't enough to get the compressor spinning initially. Starting components consist of two parts, a start capacitor and a potential relay. The starting components are wired in in series with the compressor run capacitor. When the compressor turns on, the start capacitor gives the compressor an extra "kick in the pants" to get it going, then as soon as the compressor is spinning, the potential relay disconnects the start capacitor from the circuit for the duration of the run time and resets when the compressor turns off. Most likely, your indoor unit has a thermal expansion valve (commonly known in the trade as a TXV). This valve maintains a somewhat substantial differential between the high side and low side of the compressor after the system turns off which can be difficult for the compressor to overcome without help. Right now the compressor is trying to come on, can't overcome the pressure, and is tripping it's internal overload to protect itself. Eventually, as the overload repeatedly trips and resets over and over, the compressor will finally get around to a position where it will start once in a while. I am not a gambling man and I would bet you money that this will solve your problem. If you would be so kind as to rate my solution "Fix-Ya".

Jul 03, 2008 | Heating & Cooling

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