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 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

  • GP8155 Exploded View
  • GP8155 Parts List
  • GP8155 Torque Specifications
  • GP8155 Technical Drawing

Sorry, there are no accessories associated with this product.

  • Giant Industries Limited Warranty
  • GP8155 Installation Instructions
  • GP8155 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Max Flow (Continuous) 75.5 GPM 285 L/min
Max Discharge Pressure (Continuous) 3000 PSI 200 bar
Speed 580 RPM
Inlet Pressure 29 PSI 2 bar
Plunger Diameter 2.17″ 55 mm
Stroke 2.83″ 72 mm
Max Temp @ 1000 RPM 86 °F 30 °C
Crankshaft Diameter 70 mm
Key Width 14 mm
Crankcase Capacity 4.2 gal 16.0 L
Weight 794 lbs. 360 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 Component Materials
Manifold Nickle-Plated Spheroidal Cast Iron

Click the image to enlarge


RPM GPM 500 PSI 1000 PSI 2000 PSI 3000 PSI
300 39 13.9 27.9 55.7 83.6
400 52 18.6 37.1 74.3 111.4
500 65 23.2 46.4 92.9 139.3
580 75.5 27.0 53.9 107.9 161.8

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 #09616
38A 13286 O-Ring 6
38B 05281 Support Ring 6
39A 05066 O-Ring 3
40 07723 Seal Ring 3
42 05277 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.