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.
For longevity of the pump, we recommend the impeller and seal be replaced under the following guidelines:
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 key slot in impeller with the key 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.
If water drips from the area where the shaft exits the pump, the seal is defective and must be replaced. While the shaft slinger barrier seal provides a first line of defense, prolonged running of the pump with a leaky seal can destroy the ball bearings of the electric motor. For seal replacement, the pump must be removed from the motor and disassembled in order to gain access to the seal area. The Nitrile seal must be pushed out of the press-fitted position and a new lip seal pressed into place, using a sealant on the outside of the lip seal housing. Refer to exploded view drawings for seal location and part numbers for ordering purposes.
Motor drive is clockwise facing pump end. Liquid flow direction is right to left facing pump end - see dimension drawing. Motor is 1/6 HP, 1725 RPM, 115VAC, TENV.
DO NOT RUN DRY - Rubber impellers generate high rubbing friction unless lubricated by liquid being pumped. Lack of liquid will cause impeller to burn up. Standard impeller in Neoprene (04), optional Nitrile impeller (05) available.
Liquids compatible with neoprene can be pumped including fresh and salt water solutions. Do not pump severe solvents or acids. When possible, flush pump with fresh water after each usage. 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, Permaguard, and Dowgard.
Suction lift to 15 ft. for model 211D is possible when impeller is wet. Suction lines must be air tight in order for pump to self prime. Always use foot valve at beginning of suction line to keep suction line full and impeller wet.