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

Spheroidal cast iron crankcase with 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 316 stainless steel manifold. Comes equipped with an integrated oil cooling system.

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

  • GP8040-5100 Information
  • Giant Industries Limited Warranty
  • Troubleshooting Guide


U.S. Metric
Flow 39.6 GPM 150 L/min
Maximum Discharge Pressure 5510 PSI 380 bar
Crankshaft Speed 580 RPM
Maximum Inlet Pressure 29 PSI 2.0 bar
Maximum Temperature 86 ºF 30 ºC
Plunger Diameter 1.57″ 40 mm
Stroke 2.83″ 72 mm
Pinion Shaft Diameter 1.77″ 45 mm
Pinion Shaft Rotation Towards Gear End of Pump
Key Width 14 mm x 70 mm
Crankshaft Mounting Either Side
Inlet Ports (2) 2″ NPT
Discharge Ports (2) 1″ NPT
Crankcase Oil Capacity 4.2 gal 16.0 L
Weight 767 lbs. 349 kg
NPSHR 24.6 ft.-head 7.5 mWs
Key Component Material
Manifold Stainless Steel
Crankcase Spheroidal Cast Iron
Plungers Solid Ceramic Oxide
Valves High Grade Stainless Steel
Seals Nitrile With Fabric Reinforcing


Click the image to enlarge


RPM GPM 2000 PSI 3000 PSI 4000 PSI 5510 PSI
300 20.5 28.2 42.4 56.6 77.9
400 27.3 37.7 56.5 75.3 103.7
500 34.1 47.0 70.6 94.1 129.6
580 39.6 54.6 81.9 109.2 150.5

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 more information.

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.