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This is perfectly normal of a new R4 compressor. They are nearly impossible to turn over by hand and most brands will include this information in the box that the compressor came in. This is why it is absolutely imperative to follow the correct installation, oil quantity, and four minute idle break-in period (Service Information - S83/26 25.07.1979). If you can turn it over by hand when out of the box, the compressor will NOT last long.
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