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Old 02-17-2011, 04:35 PM
oldred oldred is offline
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I think what you will find under that cone shaped cover is a centrifugal unloader control. I am not totally familiar with that particular compressor but it seems to be a normal set-up and as such it would appear that line is plumbed in wrong, the unloader should relieve head pressure instead of disengaging the pump. Is that line directed into the tank or is that fitting on the tank directing the circuit to the pump, is the fitting a one-way valve? You can use compressor oil or 30wt non-detergent oil, whether having the rotation direction wrong would cause a serious problem (except for cooling) would depend on whether or not the pump uses an oil pump or slinger type oiling. Obviously if it has a pump then it would not lube if turned backwards however if that is the case and it ran only a short time then probably little or no damage was done. Those things tend to "splatter" lube a little even if the pump is not working and running one backward a few minutes usually won't hurt anything, not saying it is OK to run one backwards but if it happens accidentally for a short time it usuall is no problem.
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