P100 Steam machinery oil pump

Item description "Steam machinery oil pump P100"

The item is 72 mm long, 40 mm wide, 76 mm high and weighs 165 grams.  It is made of brass and stainless steel.  The connecting rod mechanism drives the gear to rotate, and the turbine gear decelerates.  It drives the 8MM piston downward.  The piston drains the oil from the tank through the interface.  The interface thread is 1/4-40 inch thread.  There is a valve under the oil cup tube, and the locking screw needs to be loosened when the working piston reaches the lowest point.  Manually rotate clockwise, the piston moves upward to the highest point, at which time the connection is re-locked, and the next working cycle can be carried out.