This in-line diesel fuel injection pump assembly serves the 5.9 litre six-cylinder engine family badged as 6BT, 6BTA and 6BTAA, and is catalogued by the machine maker as 6738-71-1520 for Hyundai R220LC-9S and related excavators. The same physical pump carries four separate figure languages — engine side 4063844, pump maker 101062-9270, machine side 6738-71-1520, and a distributor reference — none of which indexes the others. The calibration twin 4063845 is identified here so