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Lubrication system in compressors

In tandem type compressor, the higher pressure piston (bottom) is lubricated by splash from the crankcase or forced lubricated using lubricators and pump. The top stage is invariably lubricated by lubrication pump drawing suction from the crankcase. Running gear is force lubricated by a pressure pump drawing oil from the crankcase discharges it through through the main bearing to  the crankshaft passage into the bottom end bearings and traveling to gudgeon pin. the pump is operated by an eccentric drive attached to the shaft or roller chain. 
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