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

  • GP8045 Exploded View
  • GP8045 Parts List
  • GP8045 Torque Specifications
  • Giant Industries Limited Warranty
  • GP8045 Installation Instructions
  • GP8045 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Maximum Flow 48.9 GPM 185 L/min
Maximum Discharge Pressure 4350 PSI 300 bar
Maximum Speed 580 RPM
Inlet Pressure 29 PSI 2 bar
Maximum Temperature 86 °F 30 °C
Plunger Diameter 1.77″ 45 mm
Stroke 2.83″ 72 mm
Crankshaft Diameter 70 mm
Crankshaft Rotation Top of Pulley Towards Manifold
Crankshaft Mounting Either Side
Inlet Ports (2) 3″ BSP
Discharge Ports (2) 1-1/4″ BSP
Crankcase Oil Capacity 3.3 gal 12.5 L
Weight 771 lbs. 350 kg
Key Component Material
Manifold Nickel-Plated Spheroidal Cast Iron Manifold
Plunger Solid Ceramic Plungers
Valves Stainless Steel Valves
Seals Nitrile Seals with Fabric Reinforcing
Gear End Cast Iron Crankcase


Click the image to enlarge


RPM GPM 1000 PSI 2000 PSI 3000 PSI 4350 PSI
300 25.3 17.4 34.9 52.3 75.9
400 33.7 23.2 46.5 69.7 101.1
500 42.2 29.1 58.2 87.3 126.6
580 48.9 33.7 67.5 101.1 146.7

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 #09626
38A 04840 O-Ring 6
39A 05066 O-ring 3
40 13290 Seal Ring 3
42 05394 V-Sleeve 9
Inlet Valve Kit – Part #09818
51 05976 Inlet Valve Assembly 3
56A 05408 O-Ring 3
Discharge Valve Kit – #09819
52 05977 Discharge Valve Assembly 3
56A 05408 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.