Question about Hitachi Air Tools & Compressors
Really depends on the model of compressor but if it is an oil less compressor best thing is to junk it and buy a oil lubricated with a cast iron pump dont get one with aluminum if you want a compressor to last you for many years.
Posted on Mar 24, 2014
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Posted on Jan 02, 2017
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The knocking could be the damper if it last for about 5 seconds when the compressor turns on or off, or it can also be the refrigerant gassing off in the evaporator this sound can be really intermittent, but is normal with the refrigerants used today. However the compressor you see is actually the outer shell, inside of which is a refrigerant pump (i.e.: compressor) which is on internal support springs. When the unit turns off, the momentum of the internal parts can sometimes knock against the outside of the compressor case. The only "fix" would be a new compressor. However this does not actually indicates compressor failure and most likely will run many more years with no problem.
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