Oberdorfer 501M-05

Bronze 501M-05 Close Coupled Rubber Impeller Pump

Description: 501M-05 1 1/4" Rubber Impeller Pump

Model#: 501M-05 | Series#: 501

Price: $141900

Availability:Ships within 2 to 3 weeks Click for Parts Breakdown
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These Rubber 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.

This pump model is available as a pedestal style-bare shaft, clutch driven or SAE flange mount.

Note, the direction of the shaft rotation will determine inlet and outlet ports.

Pump will operate satisfactorily when mounted in any position.DO NOT RUN DRY. Rubber impellers generate high rubbing friction unless lubricated by liquid pumped and lack of liquid will cause impeller to burn up.

  • Bronze Construction - Corrosion Resistance
  • Machined-in Cam for Reduced Impeller Wear
  • Polytetrafluoroethylene (PTFE)Barrier Seals Protecting Ball Bearings
  • Mechanical Carbon Ring, Ceramic Face Main Pump Seal
  • Two Sealed Ball Bearings Spaced for Maximum Load Ability
  • Large Vent Drain Openings Separate Seal Bearing Areas
  • Shaft Slinger for Additional Bearing Protection
  • Neoprene (05) or Nitrile (06) Impellers
  • Stainless Steel Shaft
  • O-Ring Seal Between Body Cover
  • Impeller easily replaced
  • Option: Flanged Engine Mount SAE B Available

Either direct drive with flexible coupling or pulley drive can be used. Make sure both flexible coupling halves are properly aligned. When using pulley, do not over-tighten belt.



Liquids compatible with neoprene (05) can be pumped, including fresh and saltwater solutions and mild chemicals. Nitrile (06) impellers can handle oil-contaminated water. When possible, flush pump with fresh water after each usage.

Extremes of cold and heat will affect impeller life. Limits of 40o to 180o F should be observed. Do not allow liquid in pump to freeze. Drain pump by loosening cover screws and use methyl alcohol based anti-freeze compounds such as Zerex®, Shell Zone®, Pyro Permanent®, 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 the suction line is recommended.


1. Remove bearing end plate as shown in photograph.
2. Slide spacer ring (item 10) onto pump shaft against bearing.
3. Attach electric coil portion of clutch (item 3) to pump body using three screws item 6 previously removed.
4. Insert shaft key (item 5) into shaft key slot.
5. Slide pulley portion of electric clutch (item 2) onto pump shaft engaging the shaft key.
6. Slide spacer ring (item 10) onto pump shaft.
7. Install washer (item 7).
8. Install lock washer (item 8).
9. Install screw (item 9).

Document Title Download
Marine OverviewClick Here to Download
Bronze OverviewClick Here to Download
Bronze Overview MetricClick Here to Download
Specification SheetClick Here to Download

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