There are generally three types of lubrication systems in reciprocating compressors. This unit is driven from a reciprocating or rotary part of the compressor. Oil is fed from the cylinder lubricator by separate lines to each cylinder. A check valve at the end of each feedline keeps the compressed air from forcing the oil back into the lubricator. Each feedline has a sight-glass oil flow indicator.
Lubrication begins automatically as the compressor starts up.
Figure 14-7 shows the lubrication connections for the cylinders. The correct type is vital to the operation and reliability of the compressor. The running gear is lubricated by an oil pump that is attached to the compressor and driven from the compressor shaft. This pump is usually a gear type. From the cooler, the oil is distributed to the top of each main bearing, to the spray nozzles for the reduction gears, and to the outboard bearings.