Model #921166360 CRAFTSMAN Air compressor

  • Air Compressor
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  • Motor Assy
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Question and Answers

Q:

120v craftsman air compressor stopped producing air 921.166360

Q:

The motor only runs a short time and then cycles on and off. 921166360 Craftsman Air compressor

A:

Thanks for the inquiry and for being a valued member.

I am sorry to hear of the issue you're having with the compressor cycling on and off while building pressure. I know how how frustrating that is.

Due to it still building pressure, I don't suspect anything wrong internally. I would suggest having the capacitors on the motor tested. That would be the most likely issue. You can take them down to an electrical supply house locally and have them tested, usually free of cost. If you need to replace them, the part numbers are E100248 and E100247. 

I hope this helps and thanks for using SearsPartsDirect.com. We appreciate your business. 

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Jeff Wallace Sr -
Sears Technician
April 14, 2015
Q:

My compressor does not build enough pressure, can I fix it myself with your help, and some parts if i have to purchase it from you guys? 921166360 Craftsman Air compressor

A:

Thanks for the inquiry and for being a valued member.

I am sorry to hear of the issue you’re having with the compressor not building pressure past 25 PSI. I know how frustrating that is.

Your air compressor probably has something broken inside the cylinder. Disconnect the power to the air compressor and remove the plastic cover around the motor and compressor.

Before you take the compressor apart, listen and feel for air leaks. Since air is coming back out of the intake filter, something is wrong inside the cylinder.

Turn the motor shaft by hand and be sure the piston goes up and down.

If the piston is ok remove the 4 screws holding the head on top of the cylinder. Remove the head.

Directly under the head is the pressure plate. The pressure plate has reeds on it that direct the air into the discharge line and keep the air from going back through the intake side of the compressor. Check the reeds for warping or breaking. If the reeds are damaged, you must replace the pressure plate. Make note of how the pressure plate sets and the O-rings that seal around it.

Remove the pressure plate and inspect the cylinder walls for scratches or wear, if the cylinder is damaged you need to replace the cylinder, piston, and rings. Make note of the piston and the rings on it. If a ring is worn or broken the air goes back through the intake filter and no pressure is built. If you have to replace the rings, replace the piston and sleeve also.

To replace the rings and piston, you have to remove the nuts that hold the piston to the eccentric.

I hope this helps and thanks for using SearsPartsDirect.com. We appreciate your business.  

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Jeff Wallace Sr -
Sears Technician
March 15, 2015
A:

My compressor will not go past 20psi i checke the piston its ok ihave good pressure from the cylinder head line when disconnected I feel some air comming from the ntwo holes on the intake filter i removed the cylinder head and the reeds look ok. if i have to order a gasket kit do i have to order 2 valve reeds best yey can you please tell me what i need to order to repair my problem. if you can call me @718-383-0076 Thank You

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Ronald -
April 13, 2015
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