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Samson

Samson 302 Pumpmaster 3 55:1 Grease Pump 120 lb KEG

120 lb0.7 lb1.2 lb

Samson 302 Pumpmaster 3: 55:1 ratio air-operated grease pump rated to 7,700 PSI for 120 lb keg dispensing applications

$773.95*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

The Samson 302 Pumpmaster 3 addresses the need for reliable, high-pressure grease dispensing in service shops, agricultural operations, and light industrial facilities. With a 55:1 pressure ratio generating up to 7,700 PSI at the fluid outlet, it is engineered to push NLGI-2 grade grease through distribution lines and dispensing hoses at a continuous duty rate of 0.7 lb/min. The air-operated design eliminates electrical components at the point of use, a practical consideration in environments where moisture, grease contamination, or flammable atmospheres are present.

The pump operates on an air pressure range of 20 to 140 PSI with consumption rated at 5.8 SCFM, requiring compressor capacity planning as part of procurement. It is designed for 120 lb grease kegs, and installation teams should verify bung fitting compatibility with their specific keg supplier. The lightweight construction supports use in mobile and portable greasing units. Maintenance considerations include seal inspection intervals — particularly when handling synthetic or non-standard grease formulations — and availability of Samson-specific replacement parts through authorized distributors.

Key Features

Fluids Handled: Grease up to NLGI-2

Markets Served: Service Shops, Agriculture, Light Industrial

Pump Pressure Ratio: 55:1

Continupus Duty Flow Rate: 0.7 lb/min (300 g/min)

Maximum Free Flow Rat: 1.2 lb/min (540 g/min)

Specifications

Brand
Samson
Model
302
Type
Air Operated Grease Pump
Pressure Ratio
55:1
Maximum Fluid Outlet Pressure
7,700 PSI
Air Pressure Operating Range
20 to 140 PSI
Air Consumption
5.8 SCFM
Continuous Duty Flow Rate
0.7 lb/min (300 g/min)
Maximum Free Flow Rate
1.2 lb/min (540 g/min)
Fluids Handled
Grease up to NLGI-2
Drum Compatibility
120 lb KEG
Markets Served
Service Shops, Agriculture, Light Industrial

Pros & Cons

👍 Pros

  • 55:1 pressure ratio delivers 7,700 PSI maximum outlet pressure, sufficient for NLGI-2 grease in long distribution lines
  • Lightweight construction supports portable and mobile greasing unit configurations
  • Wide air pressure operating range of 20 to 140 PSI accommodates variable shop compressor outputs
  • Air-operated design eliminates electrical hazard concerns in wet or industrial environments
  • Continuous duty flow rate of 0.7 lb/min provides predictable throughput for scheduling greasing operations

👎 Cons

  • Rated only for grease up to NLGI-2, limiting use with higher-viscosity specialty greases
  • 120 lb keg compatibility only — not directly adaptable to standard 400 lb drums without additional hardware
  • Air consumption of 5.8 SCFM requires a adequately sized compressor, adding to total system cost
  • Limited manufacturer documentation on seal material compatibility with synthetic or specialty grease formulations
  • No published data on calibration or output verification procedures for confirming pressure ratio accuracy over time

Frequently Asked Questions

The maximum fluid outlet pressure is 7,700 PSI, achieved at the 55:1 pump pressure ratio with full air inlet pressure of 140 PSI.
The pump is rated for grease up to NLGI Grade 2, which covers the standard multi-purpose greases used in most service shop and agricultural applications.
Air consumption is 5.8 SCFM with an operating air pressure range of 20 to 140 PSI, requiring a compressor sized accordingly for continuous duty operation.
Continuous duty flow rate is 0.7 lb/min (300 g/min). Maximum free flow rate is 1.2 lb/min (540 g/min). Size your dispensing schedule around the continuous duty figure for sustained operations.
The Samson 302 is designed specifically for 120 lb grease kegs. Confirm keg dimensions and bung fitting compatibility before procurement.

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