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The motor does not take oil on that unit. The compressor housing does though. If you cant get it to start after it ran dry, the cylinder is most likely seized to the piston.
Some of the craftsmen compressors have pistons that are coated on the top of the dome. Once the coating wears off, they have severe loud piston slap. If you continue to run it the way it is, it will snap the connecting rod in half or break the piston and possibly the cylinder.
Oil free pumps do tend to blow the piston ring (not too expensive) available at searsparts.com. Remove covers to pump and manually turn crank until piston is at top and look at the condition of the cylinder neer top, If it looks scratched, order cylinder kit with piston ring. If it looks good and shiney, could be the valve plate in the head. There are reed valves that tend to break. Run pump however with covers removed and check with soapy water for air leaks and repair as needed (air leaks under the cover will prevent unit from filling). Good luck
are you using an extension cord? if so, plug the compressor into a wall socket, if it fires up fine then your extension cord is too long or not heavy enough - other problems could be a bad start capacitor, a loose connection in the pressure switch, or a bad switch
unplug it and see if you can turn the motor pulley by hand, it should turn freely. If it does, check to see if the motor runs with the belt off. If the motor runs by itself then either the belt was too tight or the compressor is seized.
Not the motor, but probably the compressor shot. Heat from friction (due to running without oil) probably scored the cylinder walls, which allows air to escape past the piston and rings, making the compressor VERY inefficient. Some compressors have replaceable cylinders... Not sure if the very small ones do or not.
Hi, First, I think the cutoff pressure is 135psi and there is an overpressure valve so let it run a little longer. I don't know exactly which model you have ( some of these were oil less) but if it is running longer than you remember, be sure to check the oil if necessary, make sure you are not using a long extension as this will cause the motor to slow down and definitely check to make sure the water is drained and the drain petcock is closed all the way. Also check it without an air hose attached. Good Luck!
worn compressor rings, not a real issue, I assume it is more of a build up over time, say a gram of oil is blown into the lines every year, well one gram would not be noticed nor two but since it soes not evaporate it builds up to the point that you can see it, some oil is blown by brand new compressors and over time gets to be more and more, but as long as you are still getting full pressure you do not have to service the compressor, but since this is being used on water pipes I would install a trap inline to catch the oil
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