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The various air motors of a rock drilling rig are supplied with oil through oil lines which are furnished with predetermined metered oil flows from positive displacement pumps that are operated in synchronism with each other by an air operated oscillator. There is a normally closed shut-off valve in

The various air motors of a rock drilling rig are supplied with oil through oil lines which are furnished with predetermined metered oil flows from positive displacement pumps that are operated in synchronism with each other by an air operated oscillator. There is a normally closed shut-off valve in each oil line. The respective shut-off valve is opened when the respective air line is pressurized. When a shut-off valve is closed, the respective metered oil flow escapes through a pressure relief valve.

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Method of lubricating a plurality of compressed air consuming devices that are independently supplied with compressed air through supply lines controlled by supply valves, the method comprising: supplying metered flows of lubricant to lubricant supply lines by means of positive displacement pumps, t

Method of lubricating a plurality of compressed air consuming devices that are independently supplied with compressed air through supply lines controlled by supply valves, the method comprising: supplying metered flows of lubricant to lubricant supply lines by means of positive displacement pumps, the supply lines being provided with normally closed shut-off valves and leading to the respective air consuming device, the metered flows of lubricant being constantly supplied and kept flowing even when the shut-off valves are closed, operating the positive displacement pumps in synchronism with one another, sensing the air pressure in the air lines downstream of the supply valves, opening the respective shut-off valve in response to the sensed presence of the air pressure in the respective air line being pressurized, and providing pressure relief valves (48-52) in said lubricant supply lines (36-39, 40, 41) to permit the metered flows of lubricant in the lubricant supply lines to escape when the respective shut-off valves are closed, to thereby keep the metered flow of lubricant constantly flowing.