Model #921166420 CRAFTSMAN air compressor

  • Compressor
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Question and Answers

Q:

The air compressor (sears model 921-166420) keeps tripping the reset button. before pressure maxes.

A:

Se,

I am sorry you are having a problem with the compressor. I think you are on the right track with a capacitor or motor problem. To make sure, I recommend running the motor until it trips. Then turn the unit off at the on/off switch. Air should only leak out for a few seconds. If it does that, we know check valve is working and the problem is in the motor. It is easiest to check the capacitor with a capacitor checker. If you do not have one, I would just replace the capacitors first. The manufacturer does not offer the capacitors separately. You should be able to find them at a local electrical supply company. Just remove the capacitors and take them with you. They might be able to check the capacitors when you bring them in. If replacing the capacitors does not fix the compressor, the motor is the problem. I looked up the cost of the motor/pump assembly and it cost $152.49. The motor can be ordered from the following link. If you decide to purchase, a new compressor please let me know I will be happy to give you some recommendations. Just let me know what you are doing with the compressor and I will find the best fit for you. There are only a few manufacturers making compressors.

Thank you for using Manage my life. Mark T.

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Mark T -
Sears Technician
September 16, 2012
A:

Se,

If the motor does not want to start once, there is pressure in the tank I recommend checking the pressure relief valve. The relief valve is located on the side of the pressure switch. To verify the relief valve is working, run the compressor for a few seconds. Then turn the switch off and listen for air to leak out. You should hear it leak out of the pressure switch for a few seconds. If it does not do this, the pressure switch needs to be replaced. If it does do that, the problem is likely in the motor. Craftsman Air compressor parts Here is the link for the parts website.

Please let me know if you need further assistance.

Thank you for using Manage My Life! Mark T.

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Mark T -
Sears Technician
September 17, 2012
A:

Se,

I am sorry that did not cure the problem. Based on what you replaced so far the problem has to be in the motor. One of two things in particular. Either the internal breaker is weak from tipping so much or the centurial switch has dirty contacts that intermittently fail. The dirty contacts cause the motor to draw more amps and trip the internal breaker. The only way to fix either one of these issues is to replace the motor. The manufacture of this compressor does not offer motor components. This is true for most motors used today. If you use the compressor daily, I recommend getting and oil filled compressor. I posted a few links below to models I recommend. The oil compressors cost a little more but if maintained, will outlast the oil less units. Again, I am sorry about the problems you have with this compressor.
Please let me know if you need further assistance.
Thank you for using Manage my life. Mark

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Mark T -
Sears Technician
September 23, 2012
A:

Bedford,

I am sorry you are having a problem with the compressor. Some compressors have a manual rest on the ends of the motor. If your model has a reset, you should see a red button to push. If you do not see a red button please reply below with the model number of the compressor. Once I have the model number, I should be able to give you more checks to determine the problem.

Thank you for using Manage my life. Mark T.

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Mark T -
Sears Technician
December 13, 2012
A:

Dr. Jim, I am glad to hear you have found the problem. The manufacturer does not offer the breaker as a separate part. If you could please send me an image of the breaker used, I will be happy to assist you in looking for the replacement. I hope to hear from you. Thank you for using Manage my life. Mark T.

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Mark T -
Sears Technician
March 07, 2013
A:

Frederick, If the motor does not make any noise at all when you turn the switch on, I recommend checking the outlet first. If the outlet is fine, I recommend unplugging the cord and removing the cover on the top of the pressure switch. Next, check the wire connections. All the wires should be tight. If they are, go ahead and reinstall the cover and check the operation. If it still does not make any noise you will need a voltmeter to check the voltage going to the motor. If you have a meter, unplug the unit from the outlet and remove the pressure switch cover. Then locate the two wires going to the motor and connect the meter leads to them. After you have the leads connected, carefully plug the power cord into the outlet. The meter should read around 120 volt AC. If you do not get this reading, I recommend replacing the pressure switch. If you do get this voltage, the motor needs to be replaced. Please only do the live voltage checks if you feel comfortable working around live voltage and use caution. Once you determine the problem, you can order the parts from the following link. Craftsman air compressor parts

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Mark T -
Sears Technician
July 29, 2013
A:

Robert, If the motor still trips the breaker with the pump disconnected, the problem will be in the motor. If the capacitor is fine, I suspect it is an internal motor problem. I am sorry the manufacturer does not offer motor parts. The only way to repair this would be to replace the motor. Usually the cost of the motor exceeds the value of the unit.

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Mark T -
Sears Technician
September 25, 2013
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