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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

Specification US Metric
Flow49 GPM185 L/min
Maximum Discharge Pressure4350 PSI300 bar
Crankshaft Speed580 RPM
Power143 HP107 KW
Max Temperature86 °F30 °C
Inlet Port Size(2) 3" BSP
Discharge Port Size(2) 1-1/4" BSP
Plunger Diameter1.77 in.45 mm
Stroke2.83 in.72 mm
Maximum Inlet Pressure29 PSI2 bar
Crankshaft Diameter1.77 in.45 mm
Crankshaft RotationTowards Gear End
Key Width0.55 in.14 mm
Crankshaft MountingEither Side
Crankcase Oil Capacity US4.2 gal 16.0 L
Weight767 lbs.348 kg
Manifold Material Nickel-Plated Spheroidal Cast Iron
Crankcase Material Spheroidal Cast Iron
Plunger Material Solid Ceramic Oxide
Valve Material Stainless Steel
Seal Material Nitrile with Fabric Reinforcing
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.
Plunger Packing Kit – Part #09626
38A 04840 O-Ring 6
39A 05066 O-Ring 3
40 13290 Seal Ring 3
42 05394 Sleeve 9
Inlet Valve Assembly Kit – Part #09725
51B 05978 Suction Valve Seat 3
51C 05314 Valve Plate 3
51D 05408 O-Ring 3
51E 05450 Valve Spring 3
51F 05596 O-Ring 3
52D 05408 O-Ring 3
Large Discharge Kit – Part#09726*
52B 05979 Discharge Valve Seat 3
52C 05314 Valve Plate 3
52D 05408 O-Ring 6
52E 05450 Valve Spring 3
52F 05596 O-Ring 3
* Since the discharge valve seat has two sides, you might be able to order kit # 09726A instead of the 09726
Discharge Valve Kit – Part#09726A
52C 05314 Valve Plate 3
52D 05408 O-Ring 6
52E 05450 Valve Spring 3
52F 05596 Valve Spring Guide 3
Oil Seal Kit – Part #09584
32 05058 Radial Shaft Seal 3
33A 05056 O-Ring 3

Horsepower Specifications

RPM GPM 1000 PSI 2000 PSI 3000 PSI 4350 PSI
300 25.3 17.5 35.0 52.4 76.0
400 33.8 23.3 46.6 69.9 101.4
500 42.2 29.1 58.3 87.4 126.7
580 49 33.8 67.6 101.4 147.0

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP8145 Exploded View
  • GP8145 Parts List
  • GP8145 Torque Specification


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP8145 Installation Instructions
  • GP8145 Repair Instructions
  • Troubleshooting Guide

Sample Pump

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For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

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