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71 Series

Grinder Pumps and Systems // Shark® Series

71 Series

3, 5 & 7-1/2 BHP, 3450 RPM Flanged Discharge Grinder Pump

Features and Benefits

Covered by US Patent Number 6,364,620. 


  • Sewage lift stations
  • Housing developments
  • Low pressure sewer systems
  • High vertical lift or long force mains



  • 440 stainless steel cutter and plate hardened to Rockwell C55-60
  • Discharge: 2-1/2” flanged horizontal adaptable to 3” flange, 2” NPT optional
  • Seals – dual mechanical carbon/rotary, ceramic/stationary, Buna-N elastomers
  • Moisture detection system
  • Construction – cast iron ASTMA A-48, Class 30, 30,000# tensile strength, protected with a corrosion-resistant, baked-on epoxy powder coating
  • Balanced, concentric pump housing and impeller
  • Attaching hardware – 304 stainless steel
  • Square ring seals – Buna-N
  • Impeller – ductile iron vortex design
  • Optional:
    • Trimmed impeller
    • Silicon carbide seal(s)
    • Bronze vortex impeller
    • Viton square ring seals
    • Additional cord length
    • 2” NPT vertical discharge – HH and HF units only
    • High flow
    • Automatic reversing (3 Ph flanged models only)
    • Rail systems 


  • Stator – Class F insulation and lead wires, Nema B design
  • Thermal sensor with leads
  • Housing – cast iron, oil-filled
  • Ball bearings – upper and lower high carbon chromium steel
  • Power and sensor cable length – 25' (7.6 m)

Note: Product information presented here reflects conditions at time of publication. Consult factory regarding discrepancies or inconsistencies.

Product Specifications

  • 25’ (8 m) heavy duty power cable.
  • Protected cable entrance. The compression grommet allows for field replacement of the cable.
  • Each conductor is individually sealed to eliminate cord wicking of liquids.
  • Lifting lug integral part of housing.
  • Oil-filled motor housing assures uniform heat distribution, lubricates bearings and conducts heat for cooler running.
  • Heavy-duty motor features ball bearing construction. Class F motor insulation is double-dipped and baked. End connections and lead wires are Class F. At maximum load, winding temperature will not exceed 250 °F (121 °C) with motor housing not submerged.
  • Tandem seals. Carbon/rotating, ceramic/stationary, Buna-N elastomers.
  • Upper and lower high carbon chromium steel ball bearings.
  • Stainless steel shaft and hardware resists corrosion.
  • Patented moisture detection system with upper and lower probes, protecting the motor from liquid entry.
  • Thermal sensor protection.
  • 25’ (8 m) sensor cable.
  • Ductile iron vortex impeller design, bronze optional, fully balanced with integral pump out vane to clear debris.
  • “Star” type stainless steel cutter and plate hardened to Rockwell C55-60.
  • Concentric case reduces radial loading for longer bearing and seal life.
  • 2-1/2” flanged horizontal discharge adaptable to 3” flange. Optional 2” NPT vertical discharge available for HH and HF models.
  • Vent hole helps prevent air locking.
  • Screw on pipe legs for field flexibility.
  • Class 30 cast iron housing protected with corrosion-resistant, baked-on epoxy powder coating.
  • Finned motor housing for quicker heat dissipation.

Technical Data

Selection Guide

For information on additional Zoeller® Engineered Products refer to catalog on Rail Systems ZM1347; Control Panels ZM1342, SM1343; Float Switch Brackets ZM1328; Pump Lifting Cables ZM1328; Check Valves and Piping Accessories ZM1348.

Pump Performance Curves

Design Tools