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A German-made triplex plunger positive displacement pump with reciprocating plungers for belt drive applications.

Spheroidal cast iron crankcase with sight glass and vented dipstick; forged, through-hardened, ground and polished crankshaft; bronze connecting rods; hardened stainless steel plunger bases; solid ceramic plungers; nitrile seals (with fabric reinforcing); stainless steel valves and nickel-aluminum-bronze manifold.

WARNING: This product might contain a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to

Specification US Metric
Flow46.5 GPM175.9 L/min
Maximum Discharge Pressure1740 PSI120 bar
Crankshaft Speed800 RPM
Power55.8 HP41.6 KW
Max Temperature140 °F60 °C
Inlet Port Size(2) 2-1/2" BSP
Discharge Port Size(2) 1-1/4" BSP
Plunger Diameter1.77 in.45 mm
Stroke1.89 in.48 mm
Maximum Inlet Pressure29 PSI2 bar
Crankshaft Diameter42 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US1.1 gal 4.2 L
Weight309 lbs.140 kg
Manifold Material Aluminum Nickel Bronze
Crankcase Material Spheroidal Cast Iron
Plunger Material Solid Ceramic Oxide
Valve Material Stainless Steel
Seal Material Nitrile with Fabric Reinforcing
The repair kits listed to the right are available for this pump. If you need further information about these repair kits, or have questions about other specific parts for your pump, please contact you local Giant distributor or contact Giant customer service.
Plunger Packing Kit – Part #09876
41A 07721-0001 O-Ring 3
41C 13141-0001 O-Ring 3
44 13294 Sleeve 9
46 05057 Compact Ring 3
48 05474 Clipring 3
Valve Assembly Kit – Part #09877
51A 12564-0100 Valve Seat 6
51B 03690 Valve Plate 6
51C 12566 Valve Spring 6
51E 03675 Valve Guide 6
52 05166-0001 O-Ring 6
57 05167-0001 O-Ring 3
Oil Seal Kit – Part #09878
32 06118 Radial Shaft Seal 3
33A 07721 O-Ring 3
33B 13217-0100 Clipring 3

Horsepower Specifications

RPM GPM 500 PSI 750 PSI 1000 PSI 1740 PSI
400 23.0 8.2 12.3 16.4 28.6
500 29.0 10.4 15.5 20.7 36.0
600 35.0 12.5 18.8 25.0 43.5
700 41.0 14.6 22.0 29.3 51.0
800 46.5 16.6 24.9 33.2 57.8

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP6145-3100 Exploded View
  • GP6145-3100 Parts List
  • GP6145-3100 Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP6145-3100 Installation Instructions
  • GP6145-3100 Repair Instructions
  • Troubleshooting Guide

Sample Pump

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For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

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