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GP5122 - Giant Pumps Skip to main content
Featured Image for GP5122

A German-made reciprocating triplex plunger pump.

Spheroidal cast iron crankcase with sight glass and vented dipstick; forged, through-hardened, ground and polished crankshaft; bronze connecting rods; hardened stainless steel plunger bases; special ceramic plungers; Aramid/Teflon packing; stainless steel valves; 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 www.P65Warnings.ca.gov

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Specification US Metric
Flow11.9 GPM45 L/min
Maximum Discharge Pressure7250 PSI500 bar
Crankshaft Speed930 RPM
Power59.0 HP44.0 KW
Max Temperature140 °F60 °C
Inlet Port Size(2) 3/4" BSP
Discharge Port Size(2) 1/2" BSP
Plunger Diameter0.87 in.22 mm
Stroke1.81 in.46 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter35 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US1.2 gal 4.6 L
Weight176 lbs.80 kg
Manifold Material Stainless Steel
Crankcase Material Spheroidal Cast Iron
Plunger Material Special Ceramic
Valve Material High Grade Stainless Steel
Seal Material Aramid/Teflon Packing
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 #09785
36 07023 O-Ring 3
38 07303 O-Ring 3
39 04503 Guide Ring 3
41 04504 Spiral Ring 6
44 12055 O-Ring 3
45 07693 Support Ring 3
47 06266 Support Ring 3
48 07150 O-Ring 3
Valve Assembly Kit – Part #09787
47 06266 Support Ring 3
48 07150 O-Ring 3
51 04513 Valve Assembly 6
53 05972 O-Ring 3
Oil Seal Kit – Part #09230
31 13284 Oil Seal 3

Horsepower Specifications

RPM GPM 3625 PSI 5000 PSI 6000 PSI 7250 PSI
500 6.4 16.0 22.1 26.5 32.0
600 7.7 19.3 26.6 31.9 38.5
700 9.0 22.5 31.0 37.2 45.0
800 10.2 25.5 35.2 42.2 51.0
850 10.9 27.3 37.6 45.1 54.5
930 11.9 29.8 41.0 49.2 59.5

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP5122 Exploded View
  • GP5122 Parts List
  • GP5122 Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP5122 Installation Instructions
  • GP5122 Repair Instructions
  • Troubleshooting Guide

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Sample Pump

Our Company

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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