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

  • GP6124-4000 Torque Specifications
  • Giant Limited Warranty
  • Installation Instruction
  • Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 12.8 GPM 48.5 L/min
Maximum Discharge Pressure 6090 PSI 420 bar
Crankshaft Speed 800 RPM
Maximum Inlet Pressure 90 PSI 10 bar
Maximum Temperature 140 °F 60 °C
Plunger Diameter 0.95″ 24 mm
Stroke 1.89″ 48 mm
Crankshaft Diameter 42 mm
Shaft Rotation Top of Pulley Towards Manifold
Shaft Mounting Either Side
Inlet Ports (2) 1-1/2″ NPT
Discharge Ports (2) 1″ NPT
Crankcase Capacity 1.1 gal 4.2 L
Weight 309 lbs. 140 kg
Key Component Material
Manifold AISI 303 Stainless Steel
Plungers Hard Metal Coating
Valves Duplex Steel
Seals Aramid Packing
Gear End Spheroidal Cast Iron


Click the image to enlarge


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

Horsepower Requirements

The ratings shown are the power requirements for the pump. Gas engine power outputs must be approximately twice the pump power requirements shown above.

We recommend a 1.15 service factor be specified when selecting an electric motor as the power source. To compute specific pump horsepower requirements use the following formulas:

Electric HP = (GPM X PSI)/1450

Gas HP = (GPM X PSI)/1100

*Engine power varies based on horizontal or vertical orientation, as well as by makes and models from each manufacturer.


Contact Giant Industries for Replacement Parts.

Repair Kits Available

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.

Service & Repair

Giant provides service on each pump and accessory that we sell. Many basic repair procedures are covered in the Giant repair manual. For all other questions on service or repair needs please contact your local Giant distributor.