Model #919170230 CRAFTSMAN Air compressor

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Question and Answers

Q:

Replaced the power switch on my 919.170230 3hp compressor. at the indicated 135 psi(?) shutoff, there is a large air leak under the switch.

A:

It would be disheartening to make all those repairs on the compressor and then have another problem reappear. I have done some research on the Manage My Life website and have located a link similar to your issue. While you are waiting for a detailed reply from an expert I have provided the link below. Hope this helps!

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Priscilla V -
June 06, 2012
A:

Thank you for your question on the leak under the new pressure switch.

Can you tell if the leak is coming from the pipe that you attached the pressure switch too? If it is perhaps you will need to add some pipe sealant to the fitting if you did not do so.

Can you tell if the leak is coming from the unloader valve for the pressure switch?

The small tubing connection on the side of the pressure switch is supposed to unload the air from the head at the pressure switch so the compressor can start easier. This is normal but should only last a few seconds and then stop.

If it is leaking continuously from the pressure switch frame on the bottom then the pressure switch may be bad.

Please let me know what you find out.

Sam A.

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Sam A -
Sears Technician
June 08, 2012
A:

The leak is at the bottom of the switch where the small connection from the head returns. It is not at the tubing connection, but under the Ell where the signal turn left into the switch cavity. It seems that the "unloader" is functioning to relieve the pressure at the head, but vents continously untill the switch cycles the power back on. I think it should stop after a short few seconds...

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harold -
June 08, 2012
A:

Thank you for the update Harold on the leaking air compressor. If the air is not leaking from the fitting and does not stop when it unloads the small air line then it must be coming from a ruptured diaphragm on the pressure switch and is leaking back from the air tank up into the pressure switch. It does sound like the pressure switch is bad. I would suggest replacing the new pressure switch and returning the faulty one. Sam A.

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Sam A -
Sears Technician
June 11, 2012
A:

The second replacement switch gave the same symptom. I searched another compressor model file and they suggested a failed check valve? Makes sense to me. If the check valve is open the storage tank just vents back to the compressor head and down to the unloader. I've ordered a replacement and we shall soon see.

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harold -
June 15, 2012
A:

Thank you for the update Harold. I hope that will solve your problem. Usually if the check valve is bad the line from the check valve to the pressure switch will continue to leak at the pressure switch if the check valve is bad and will continue to bleed the air out of the storage tank. Please let me know if that solved your problem. Sam A.

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Sam A -
Sears Technician
June 25, 2012
A:

The replacement check valve fixed the problem. When I removed the old valve, I saw that the spring retainer cap was missing (probably at the bottom of the 30 gallon storage tank) and the valve did not work. The new assembly made the system function as a Craftsman should. Pleased to get it fixed...

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harold -
June 27, 2012
A:

Thank you Harold for letting me know that the check valve fixed the problem. Thank you. Sam A.

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Sam A -
Sears Technician
June 27, 2012
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