M1-4 Motivo Gear Pump M120 Gear Pump M580 Gear Pump

M Series Motor Speed Internal Gear Pumps Economical Motor Speed Pumping Performance

In continuous-circulation applications, efficiency and service life determine operational success — and Blackmer® M Series Motor Speed Internal Gear Pumps are engineered to protect both. M Series Pumps can transfer demanding products ranging from petrochemicals and biofuels to paints, resins and waxes. Each model connects directly to a standard motor, eliminating the need for a gear reducer, belt, or sheave alignment and replacement. Its pull-out construction keeps the rotating element easily accessible for routine maintenance and servicing.

The compact M120 and the M580 models, which handle liquids with either lubricating or non-lubricating characteristics, include an integral adjustable bypass valve. The M1-4 Motivo adds a single-point end-clearance adjustment and an upgraded silicon carbide seal for up to 25% longer life under certain conditions. Each Blackmer M Series model is backed by a one-year warranty.

Available Materials
  • Cast Iron
Temperature Range
  • 212–400°F (100–204°C)
Capacity
  • 3.6–30 gpm (0.8-6.8 m³/h)
Pressure Range
  • 150–203 PSIG (10.3–14 BAR)
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Features and Benefits

  • Quiet operation
  • High overall efficiency
  • Low maintenance, long life
  • Easy pull-out construction
  • Direct coupling to synchronous speed motors
  • High-speed performance suitable for moderate and thin viscosity applications
  • Variable mounting orientation
  • Lightweight, compact and robust
  • Integral adjustable bypass valve (M120 and M580 models only)
  • Mechanical seal

Specifications and Performance

Model Port Sizes Materials Seal Type Nominal Pump Rating Max Discharge Pressure Max Temperature Viscosity
RPM GPM (m³/h) PSIG (BAR) Fahrenheit (Celsius) SSU (CST)
M1-4 Motivo 1-1/2" NPT Cast Iron Mechanical 1,750 30 (6.8) 150 (10.3) 400°F (204°C) 2,600 (550)
M580 3/4" NPT Cast Iron Mechanical 1,800 7.5 (1.7) 203 (14) 212°F (100°C) 45,500 (10,000)
M120 1/2" NPT Cast Iron Mechanical 1,800 3.6 (0.8) 203 (14) 212°F (100°C) 45,500 (10,000)

M120 and M580 pumps utilize right hand rotation (when viewed from drive end). M1-4 Motivo pumps featuire bi-directional rotation capability.


Competitor Model Cross Reference

Blackmer Motivo™ Viking® Gorman-Rupp® Roper®
M1-4 HL4195 GMS 1 1/2 2AM32

Note: Viking® is a registered trademark of Viking Pump, Inc., a unit of IDEX Corporation. Gorman-Rupp® is a registered trademark of Gorman-Rupp® Company. Roper® is a registered trademark of Roper Pump Company.


Applications

  • Chemicals
  • Distillate
  • Fuel oils
  • Kerosene
  • Lube oils
  • LPG
  • Paints
  • Petrol
  • Solvents
  • Transformer oils
  • Vegetable oils

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