The N305M are portable, bronze constructed flexible impeller pumps with an all stainless steel shaft. Features include available AC or DC motors, easily replaceable impellers and cams, standard neoprene impellers with nitrile as an option, reversible wear plate and a nitrile mechanical seal. Flexible blades on the periphery of the impeller provide the pumping action. While the impeller rotates the liquid between the blades is continuously squeezed out into the discharge port by a machined in cam located inside the pump chamber. Pump will operate when mounted in any position.
The pump is driven directly from the electric motor shaft. An aluminum adapter connects the pump to the motor. Reversing supply leads to motor terminals reverses motor rotation. “In” and “Out” pump ports are also reversed.
DO NOT RUN DRY - Flexible impellers generate high rubbing friction unless lubricated by liquid pumped. Lack of liquid will cause impeller to burn up.
Liquids compatible with neoprene can be pumped including fresh and salt water solutions and mild chemicals. Do not pump severe solvents or acids. When possible flush pump with fresh water after each use.
Extremes of cold and heat will affect impeller life. Limits of 40°F to 180°F should be observed. Do not allow liquid in pump to freeze. Drain pump by loosening cover screws. Use methyl alcohol based anti-freeze compounds such as Zerex, Shell Zone, Pyro Permagard, or Dowgard.
Suction lift of 15 feet is possible when impeller is wet. Suction lines must be air tight in order for pump to self prime. A foot valve at the beginning of suction line is recommended.