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How does the electric motor couple to the compressor? Is it easy to remove the motor for bearing rplacement?

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  • theringf Apr 06, 2011

    what type of compressor do you have ?



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Some oil lubed compressors as well as oilless types have a bolt on rod journal that can be removed to allow motor to be seperated from pump. Others, however have journal either one piece to motor shaft or journal is pressed on. If you do not see bolt thru journal, most likely it will not seperate. Check with parts manual for more information as some motors have a removable iron core on the shaft (very difficult to remove and re-install). Good luck

Posted on Apr 08, 2011


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1 Answer

Why does it pop the reset button?

The button is a current overload protection for the motor. There is a variety of causes. Defective motor windings, carbonized burnt pressure switch contacts, loose connection (e.g. cord to plug, switch terminals, motor terminals), wrong voltage supply to the motor, worn motor bearings, drive belt too tight, or defective driven machine.
I would run the motor with no load, remove the belt or coupling to the compressor pump, and read the amperes and compare to the motor nameplate rating, let it idle a few minutes and listen for bearing noise. By reading motor amperes or current while the compressor is still connected to the motor, it can be determined if the reset button/overload protector is weak. Check every electrical connection for discoloration or overheating and repair if any are found. Check the contacts of the pressure switch. If nothing wrong is found and the motor is just overdrawing current or amperes, then it is time to replace the motor, probably due to a weak or defective motor internal winding.

May 27, 2015 | Air Tools & Compressors

1 Answer

Impeller shaft bearing replacement behind shaft pulley

be sure all fasteners are out (bolts set screws etc)
try pb blaster spray
then its heat it up time
good luck

Feb 07, 2015 | Garden

1 Answer

I have a Campbell hausfeld air compressor and it turns on and fills up to about 90 psi then turns off and wont turn back on not even to refill the tank if I unplug it for 30 mins it will turn back on whats...

The electric motor probably has an automatic resetting overload. Most likely what is happening is that as the pressure increases so does the load on the motor. When it gets to a certain point the motor overload opens the circuit and the compressor stops and won't restart until it has cooled down and reset itself. The overload is sensitive to both current and temperature; it is inside the motor housing and may look something like this:
The most likely cause of your problem is low voltage due to too small wire or too long of a wire run to the motor. Other things to check are dust and dirt in the motor not letting it cool properly, too much friction in the compressor, restriction in the compressor outlet, bad connections anywhere in the electrical system from the main breaker panel all the way to the motor including the pressure switch at the compressor; worn motor bearings [or compressor bearings].
How to Check an Electric Motor

Feb 01, 2015 | Campbell Hausfeld Air Tools & Compressors

1 Answer

I have a CH 8 gal compressor that won't run. When you turn it on it just hums for a couple of seconds then stops. You hear a click and then your able to turn it on again but it still just hums

Remove the air out line and the motor. Try to turn the motor and the compressor by hand. You have a seized bearing somewhere. Bearings are available at any power transmission shop for a few dollars.

Feb 04, 2012 | Campbell Hausfeld Air Tools & Compressors

1 Answer

The motor runs fine with the belt off but when the compressor is on line the motor hums and trips the house breaker.

Turn the compressor pump pulley by hand (with belt off) and air pressure in the tank. It should be very easy to turn. If it is hard to turn, evaluate the check valve for leak. If no leak examine crank bearings for damage. Repair as needed. If easy to turn fault is with motor. Check amp draw with belt removed. When the motor comes on, it should draw about 15 amps and drop lower. The motor should start and reach full rpm in a split second. It should start with a bang and run smoothly with-out getting hot and only pull low amount of amps. If slow start and high amp draw, check capacitor/s and or start winding switch inside of motor. Sometimes the start switch will burn the contacts and give trouble. If both capacitors test within 95% of value and start switch appears to be good, look for damaged copper windings. Windings will be discolored or burned and the tie strings binding the windings will be melted. Replace as needed. Good holidays

Dec 15, 2010 | Dewalt d55170 Electric powered air...

1 Answer

I have to replace the piston rod-to-motor shaft bearing on my mod. #919.165221 compressor and I don't know how to remove the rod and bearing from the shaft.

Your unit was most likely made by Porter Cable and parts may be matched at your nearest Dewalt parts center. The best way to remove the bearing is to use a press, however the fast/dirty method is to use a Dremel with a thin cutting wheel to remove the bearing from the shaft. Remove the head of compressor being carefull not to tear gaskets. Loosen screw holding rod to bearing and remove rod (note position). Make two cuts on outer bearing shell and remove shell. Make one cut on inner race, then expand slightly with blade of screwdriver and remove. Use generic bearing 6203 available at auto parts. Clean shaft with fine sandpaper and install bearing to noted position. Probably a good time to replace cylinder and ring. Usually part Dewalt / Porter cable part #k-650 or use Sears part. After assembly turn several times by hand checking for alignent and free movement. Be carefull with the fan, easy to break. You probably should order a spare blade. Good luck with your repair and post again if you have questions.

Jun 28, 2010 | Craftsman Air Tools & Compressors

2 Answers

High pitch noise coming from under the hood louder when I push on the gas pedal

This could be a couple of things. There are bearings in the a/c compressor, alternator and p/s pump. One of these could be going out. There is also a bearing in the belt tensioner and in any idler pulleys connected to that belt setup. Check those first. If that's not it maybe check your fan. There is also a bearing in there.... If it's an electric fan disreguard that part. If it's belt driven see if it spins with the engine off, we don't want to loose any fingers. If the fan clutch is seized up that's an easy fix.

Nov 09, 2009 | 2006 Chevrolet Trailblazer

2 Answers

Motor trips breaker

As the pressure in the compressor does the demand on the motor. It sounds like the motor is worn out. It could be the bearings or the windings. You could remove the motor and have it re-built(new bearings and windings) at an electrical shop or try to find a replacement on line. If the motor does not have sealed bearings you could try re-packing them with grease or oil. Most motors now have sealed bearings and when they wear out the motor will need them replaced. Check to see if the motor is still under warranty before having it repaired. Sometimes the motor will have a much longer warranty then the rest of the compressor and you may get the manufacturer to send you a new one.

Sep 26, 2009 | Coleman Air Tools & Compressors

1 Answer

Motor labouring - electric breaker kicking out

The problem that you describe could be casued by several problems that you can check yourself. I usually begin by checking the in-tank check valve for leaking air back to the pump. Follow the air discharge hose to the tank and you will find the brass checkvalve. With about 80psi in the tank, unplug the unit from the wall and loosen the smaller fitting (or larger whichever is easier ) at the checkvalve and listen for air leak. If leaking replace with generic valve available at Just pay attention to pipe sizes. If no leaks at check valve, remove capacitors from the motor (mark the leads) and test with meter. Repair shops usually test for free if you do not have a meter that can test capacitors. The caps should test within 95% of rating printed on side. Replace with generic to save money just watch size so that they will fit under cover (also available at grainger). If no problems so far, remove the belt and check bearings on motor and compressor for noise (should be relative silent as your turn it by hand). Worn bearings on the motor will cause the motor to overheat. Worn bearings on compressor will just make noise but usually not cause your problem. If all good, then problem could be valves in pump leaking causing the pump to become very hot. This is a visual inspection by removing the head. Finally the electric motor uses sealed bearings and cannot be lubed, only replaced due to age. Good luck

Mar 24, 2009 | Coleman Air Tools & Compressors

1 Answer

Ge ptac

Hello Tom ,   I'm sure i can help you with this.... I work on these units everyday. unfortuneately im not there to put my hands on it but i will explain as clearly as possible.    The most common problem I tend to find with these units is that the control board  and indoor fan motor tends to go bad in these quite often.  If you put the unit in A/C MODE  and/or Fan mode and set it to high if it will not speed up from low , then your problem could be in a couple different places.   1st.  The bearings in the fan motor could be wearing down ,  2nd  The Control board could be bad  in that its not telling the fan motor to speed up.     


And when you tell me that the compressor doesnt run in that mode at any given time..... which the electric heat and heat pump itself works together so that when the load is really tough  that the heat pump doesnt over work and in general saves life on your compressor.      


Solution is this.


Take your indoor fan motor off and and drill out the rivits  and it pulls apart easy, and replace the bearings and grease them.


ALIGNMENT OF THE FAN IS A MUST.   doesnt cost much at all the fix this. Just a little time and bearings


Replace the Board in the control box



This my friend will definetly solve your problem.    These problems i see everyday with these same units.   

Oct 10, 2007 | GE Zoneline Deluxe Series Cooling &...

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