Resource Library – Dunham-Bush DATA DB Big Four Tech Data-compressed DUNHAM-BUSH SCREW DBX Model Number Identification DATA LSC Series MSC 110 Series MSC 127 Series MANUALS DBX Installation Maintenance Manual DBX Service Manual Parts Lists Big 4 Direct Drive Big 4 Hermetic Big 4 Two Stage Metic 1988 Multi-Drive Parts Selection Old Belt Drive Comps Service Bulletins D&B Crankcase Application Data D&B Multi Drive Orfice Plates D&B Oil Pump Installation