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A German-made reciprocating triplex plunger pump.

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; stainless plungers with hardened metal coating; aramid packing; stainless steel valves; machined stainless steel 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
Flow12.8 GPM48.5 L/min
Maximum Discharge Pressure6090 PSI420 bar
Crankshaft Speed800 RPM
Power53.1 HP39.6 KW
Max Temperature140 °F60 °C
Inlet Port Size(2) 1-1/2" NPT
Discharge Port Size(2) 1" NPT
Plunger Diameter0.95 in.24 mm
Stroke1.89 in.48 mm
Maximum Inlet Pressure90 PSI6 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 AISI 303 Stainless Steel
Crankcase Material Spheroidal Cast Iron
Plunger Material Hard Metal Coating
Valve Material Duplex Steel
Seal Material Aramid Packing
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.

Contact Giant Industries for Replacement Parts.

Horsepower Specifications

RPM GPM 1000 PSI 2500 PSI 4000 PSI 5800 PSI
400 6.4 4.6 11.4 18.3 26.5
500 8.0 5.7 14.3 22.9 33.2
600 9.6 6.9 17.2 27.5 39.8
700 11.2 8.0 20.0 32.0 46.4
800 12.8 9.2 22.9 36.6 53.1

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP6124-4000 Torque Specifications


Documents open in new window/tab.

  • Giant Limited Warranty
  • Installation Instruction
  • Repair Instructions
  • Troubleshooting Guide

Sample Pump

Our Company

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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