A German-made reciprocating triplex plunger pump.

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 nickel-plated Spheroidal cast iron 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

  • GP8065 Exploded View
  • GP8065 Parts List
  • GP8065 Torque Specifications
  • Giant Industries Limited Warranty
  • GP8065 Installation Instructions
  • GP8065 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
580 RPM
Max Flow (Continuous) 105 GPM 400 L/min
Max Discharge Pressure (Continuous) 2000 PSI 140 bar
Inlet Pressure 29 PSI 2 bar
Plunger Diameter 2.55″ 65 mm
Stroke 2.83″ 72 mm
Max Temp @ 1000 RPM 86 °F 30 °C
Crankshaft Diameter 70 mm
Crankcase Capacity 3.3 gal 12.5 L
Weight 767 lbs. 348 kg
Inlet Ports (2) 3″ BSP
Discharge Ports (2) 1-1/4″ BSP
Shaft Rotation Top of Pulley Towards Manifold
Shaft Mounting Either Side
Key Components
Manifold Nickle-Plated Spheroidal Cast Iron


Click the image to enlarge


RPM GPM 500 PSI 750 PSI 1000 PSI 2000 PSI
300 54 19.3 28.9 38.6 77.1
400 72 25.7 38.6 51.4 102.9
500 91 32.5 48.8 65.0 130.0
580 105 37.5 56.3 75.0 150.0

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.


Plunger Packing Kit – Part #09586
38A 06667 O-Ring 6
39A 05066 O-Ring 3
40 06996 Seal Ring 3
42 06997 V-Sleeve 9
Inlet Valve Assembly Kit – Part #09587
51 04186 Inlet Valve Assembly 3
56A 06258 O-Ring 3
Discharge Valve Kit – Part #09588
52 04188 Discharge Valve Assembly 3
56A 06258 O-Ring 3
Oil Seal Kit – Part #09584
32 05058 Radial Shaft Seal 3
33A 05056 O-Ring 3

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.