These Flexible Impeller pumps are made of high quality bronze of maximum corrosion resistance. All shafts consist of stainless steel grade 303. Top of the line models have ball bearings and mechanical seals while others have bronze or carbon bearings and lip type seals. Impellers are made of Neoprene Rubber. Nitrile impellers are available as an option. 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.
To maintain the pump longer, the impeller must be replaced if it is worn out or has been damaged by debris or by running the pump dry. Symptoms of a defective impeller are low pumping pressure and low flow. To replace the impeller remove screws and cover. Pull out the impeller with needle nose pliers or two screwdrivers. Be careful not to dent the pumping chamber with these tools. When inserting new impeller, line up the flat in impeller with the flat in the shaft. Use oil on shaft and avoid forcing the impeller onto the shaft. The impeller should also be removed for storage periods to prevent the blades from taking a permanent set. DO NOT RUN DRY - Rubber impellers generate high rubbing friction unless lubricated by the liquid being pumped. Lack of liquid will cause impeller to burn up.
Garden Hose Threads (External) & Pipe Threads (Internal) for Port Connections
Available with 12, 24 and 32 volt D.C. Motor Drive
Neoprene Impeller Standard (optional Nitrile Impeller - 04)
For Close Coupled AC Motor units, see Models 211D and 211M
Marine uses include Bilge, Washdown, Baitwell and General Transfer
Motor drive is clockwise facing pump end. Liquid flow direction is right to left facing pump end. Correct D.C. voltage must be supplied to motor - 12, 24 or 32 volts as specified on motor name plate.
Horizontal motor mountings - including sidewall mountings are recommended. The pump can be mounted in any of four positions 90o apart. Two screws attach pump to motor.
LIQUIDS & TEMPERATURES
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 usage. Nitrile impellers can handle oil, contaminated water and kerosene at reduced impeller service life.
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 Permanent, Permagard, and Dowgard. Rubber impeller pumps are not suitable for pumping gasoline or solvents.
Suction lift of 3 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.
Oberdorfer is part of Gardner Denver, Inc., a leading global manufacturer of highly engineered products. Gardner Denver is headquartered in Milwaukee, Wisconsin, USA and has facilities in more than 30 countries.