Oberdorfer 406MK-4-N26 - 115/230 VAC

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  • Product Code 406MK-4-N26
  • Manufacturer Oberdorfer


• All Bronze Construction

• Stainless Steel Shafts

• Portable

• Compact

• Easy Impeller Replacement

• Macerator Easily Replaced

• Reversible Wear Plate

• Vacuum Switch Shut-off Optional


Close coupled Rubber Impeller Pumps are made

of high quality bronze for maximum corrosion resistance.

The rubber impeller is either directly attached to

the stainless steel motor shaft or the impeller is

mounted on a separate stainless steel shaft which is

counterbored on the outer end in order to slide over

the carbon steel motor shaft. Ball or sleeve bearings in

the motor support the shaft. Model 406M has a

mechanical seal. Impellers are made of Neoprene rubber,

Buna N impellers are available on request.

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 cam located

inside the pumping chamber. The flow may be throttled

or shut off for a short period without the need of a

relief valve.


Close coupled Rubber Impeller Pumps are

mounted directly onto the electric motor without the

use of a shaft coupling. This pump is coupled to a

standard motors with Nema C flange. It uses a bronze

adapter plate to accommodate the pump.


Liquids handled by Rubber Impeller Pumps with

standard Neoprene impellers are primarily fresh or salt

water and water solutions. Rubber Impeller Pumps are not

suitable for pumping gasoline or solvents. Buna N

impellers can handle oil contaminated water and kerosene

at reduced impeller service life.

Liquid temperature range is from 40o F to 140oF. If

freezing conditions are expected, the pump should be

drained by loosening the cover screws and the pump

chamber should be filled with antifreeze. Viscous liquids

and oils can not be pumped with Rubber Impeller Pumps.


On initial start-up Rubber Impeller Pumps must be

primed to prevent dry-running of the impeller. Suction lifts

of 15 ft. are possible when pump is fully primed. A foot

valve with built-in strainer at the beginning of the suction

line is recommended. Suction lines should be as short as