General Specifications Compact single diaphragm positive displacement pump. Low power consumption Self-priming Can be run dry Can rotate clockwise or anticlockwise Single grease point for lubrication Dry sump to simplify maintenance No special tools are needed for maintenance Polyurethane diaphragms and seals Cast iron crankcase and covers 3/4″ suction port, 3/4″ pressure port Recommended to use HARDI suction and pressure dampers 503/7 (Ref. No. 821617) Tapered shaft For tractor use with HARDI transmission shaft Supplied with wide base plate Normal operating revolutions: 540 RPM Maximum pressure: 220 PSI (15 bar) Maximum vacuum: 13.2 PSI (0.90 bar) Weight: 20 lbs (9.0 kg) HARDI 503 Pump Parts List
