Motorised Lubrication Units Model LAU-03SFS:

Motorised Lubrication units are electric motor driven pumps along with reservoir, oil filter & breather, suction strainer, pressure relief valve & bleed valve etc.
During Motors ON time (Normally 5 seconds) all the metering cartridges eject out predetermined amount of oil at various points of the machine. And during motors OFF period (selectable) the metering cartridges get recharged for the the next Lubrication Cycle.