How do you identify the model number and date code of an LCN cast iron hydraulic closer?

The date is a 4 digit #. The first 2 numbers indicate the week it was made, and the last 2 numbers indicate what year it was made.

• On most surface mounted closers, the model #,  date code, and in some cases the shift made are stamped into the packing nut around the closer pinion shaft. For example see here.
• On overhead concealed mounted closers, the model # and date code is either stamped on the back of the closer, on the inside of the mounting plate, or on packing nut.  The closer must be removed from the frame to locate the model # and date code.  In some cases the mounting plate has to be removed from the cylinder to see the DOM on packing nut.  See additional notes for more details.