A German-made reciprocating triplex plunger pump.

Attached gearbox; 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 bronze 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

  • GP8165-1000 Exploded View
  • GP8165-1000 Parts List
  • GP8165-1000 Torque Specifications
  • GP8365 Technical Drawing
  • Giant Industries Limited Warranty
  • GP8165-1000 Installation Instructions
  • GP8165-1000 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 105 GPM 400 L/min
Maximum Discharge Pressure 2000 PSI 140 bar
Crankshaft Speed 580 RPM
Maximum Inlet Pressure 29 PSI 2 bar
Maximum Temperature 86 °F 30 °C
Plunger Diameter 2.55″ 65 mm
Stroke 2.83″ 72 mm
Crankshaft Diameter 70 mm
Crankshaft Rotation See Literature
Key Width 14 mm
Crankshaft Mounting Either Side
Inlet Ports (2) 3″ BSP
Discharge Ports (2) 1-1/4″ BSP
Crankcase Oil Capacity 4.2 gal 16.0 L
Weight 794 lbs. 360 kg
Key Component Materials
Manifold Bronze
Plungers Solid Ceramic
Valves Duplex Steel
Seals Nitrile with Fabric Reinforcing
Crankshaft Cast Iron

Click the image to enlarge


RPM GPM 500 PSI 750 PSI 1000 PSI 2000 PSI
300 54 18.6 27.9 37.2 74.5
400 72 24.8 37.2 49.7 99.3
500 91 31.4 47.1 62.8 125.5
580 105 36.2 54.3 72.4 144.8

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.