all 3 pistons are in the left-hand end position ,lubricant is entering via the right-hand side annular of piston 1 into the channel lesding to pistons 3 and squeezes the latter to the top towarts the right-hand side ,at the same time piston no.3 displaces the predetermined amount of lubricant in front of it via the connection channel and via the pistons no.1 annular groove towarts outlet no.1