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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; stainless plungers with hardened metal coating; nitrile seals with fabric reinforcing; stainless steel valves and machined stainless steel manifold.

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
Flow39.6 GPM150 L/min
Maximum Discharge Pressure5500 PSI380 bar
Crankshaft Speed580 RPM
Power146 HP109 KW
Max Temperature86 °F30 °C
Inlet Port Size(2) 2" NPT
Discharge Port Size(2) 1" NPT
Plunger Diameter1.57 in.40 mm
Stroke2.83 in.72 mm
Maximum Inlet Pressure29 PSI2 bar
Crankshaft Diameter1.77 in.45 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US3.3 gal. 12.5
Weight767 lbs.349 kg
NPSHR24.6 Ft.-head7.5 mWs
Manifold Material Stainless Steel
Crankcase Material Spheroidal Cast Iron
Plunger Material Stainless Steel
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 #09708
38A 05818 O-Ring 6
39A 05817 O-Ring 3
40 05820 Sleeve 3
40A 05821 O-Ring 3
41A 03559 Guide Ring 3
42 05825 Rope Packing 3
44 05827 Support Ring 3
Inlet Valve Assembly Kit – Part #09709
51 05837 Valve Assembly 3
56A 05408 O-Ring 3
Discharge Valve Kit – Part # 09710
52 05839 Valve Assembly 3
56A 05408 O-Ring 3
Oil Seal Kit – Part #09584A
32 05058 Radial Shaft Seal 3
32A 03118 Oil Scraper 3
33A 05056 O-Ring 3

Horsepower Specifications

RPM GPM 2000 PSI 3000 PSI 4000 PSI 5500 PSI
300 20.5 28.2 42.4 56.6 77.9
400 27.3 37.7 56.5 75.3 103.7
500 34.1 47.0 70.6 94.1 129.6
580 39.6 54.6 81.9 109.2 150.5

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP8040A Exploded View
  • GP8040A Parts List
  • GP8040A Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP8040A Installation Instructions
  • GP8040A 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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