Question about Dewalt 2 Hp 4 GAL Air Compressor
I think I can help you guys needing a replacement CC-5440M12 120V/60Hz Ronning Motor. I have been cleaning out my shop and I have four (4) of these used electric motors. All work fine. They still have the plastic fan blade on one end and the metal gear on the other. I actually have electric cords wired up on each of them that I used to make sure they worked.
Thought I would pass this information on to you. Thanks and have a great day.
Posted on Mar 19, 2009
I had the same problem and discovered that the brushed were worn out. While in the Dremel dept at home depot I noticed that the replacement brushes for model 300 ( they also fit most other Dremel tools) were very close to the size from the motor on my compressor. For under 4 dollars it was worth a try. They are actually just slightly larger so you need to sand them down on all 4 sides, go slow and keep trying for fit. Even the springs included will work, I just stuffed the whole thing in and reattached the contact clips. The graphite is softer than the originals so you may not get as much life but for the cost, it beats buying the whole motor assy. Good Luck, Mike
Posted on Aug 03, 2010
Grainger will have match motor for you. or go to baldor motors web site and ordere it.
Posted on Oct 07, 2008
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It sounds like the compressor is trying to start under load because there is a tightness in the pump itself or there is high pressure air in the line between the pump and tank There is a small valve that releases the pressure out of the main pipe that runs between the compressor and tank once the tank is full and the motor automatically cuts off. You know this valve is working by the sound of a short spurt if air being released when the motor cuts off. Releasing this pressure means that the motor is able to restart easily because there is no load. If the valve is not releasing this air, the compressor is trying to start under full load which the motor is not capable of doing, hence the slow running, overheating and popping of breakers due to a current overload as the motor tries to run up to normal peed. Motor burnout is possible if it keeps recurring.
This small release valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it or is incorporated inside the Pressure Control Switch. If the valve appears to be working then it means that the Non-return valve on the input to the tank is not sealing properly and letting air back into the main pipe causing the compressor to start under load. Check both valves for correct operation and replace as necessary.
If all the air side checks out OK the check for low oil level and / or binding in the air pump main drive shaft.
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