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A German-made triplex plunger positive displacement pump with reciprocating plungers for belt drive applications.

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 316 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
Flow65.8 GPM250 L/min
Maximum Discharge Pressure1500 PSI100 bar
Crankshaft Speed700 RPM
Power70.5 HP52.6 KW
Max Temperature140 °F60 °C
Inlet Port Size(2) 2-1/2" BSP
Discharge Port Size(2) 1-1/4" BSP
Plunger Diameter2.17 in.55 mm
Stroke2.05 in.52 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter48 mm
Crankshaft RotationTop of Pulley Towards Manifold
Key Width0.55 in.14 mm
Crankshaft MountingEither Side
Crankcase Oil Capacity1.6 gal 6.0 L
Weight374 lbs.170 kg
Manifold Material Stainless Steel
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 #09609
38A 13156 O-Ring 3
38B 07721 O-Ring 3
42 07711 V-Sleeve 9
Valve Assembly Kit – Part #09606
51B 08282 Valve Spring Guide 1
51C 07732-0100 Valve Spring 1
51D 13164-0100 Valve Plate 1
51E 08283 Valve Seat 1
51F 07653-0001 O-Ring, Viton 2
51G 13166 Support Ring 2
51H 06613 O-Ring 2
56A 07658 O-Ring 2
56B 07635 Support Ring 2
56C 13168 Support Ring 1
56D 07653 O-Ring 1
Oil Seal Kit – Part #09221
32 07624 Radial Shaft Seal 3
32A 07625 Shaft Seal 3
33A 07627 O-Ring 3

Horsepower Specifications

RPM GPM 800 PSI 1000 PSI 1300 PSI 1500 PSI
479 45.0 25.7 32.1 41.8 48.2
531 49.9 28.5 35.6 46.3 53.5
585 55.0 31.4 39.3 51.1 58.9
638 60.0 34.3 42.9 55.7 64.3
700 65.8 37.6 47.0 61.1 70.5

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP7155-5100 Exploded View
  • GP7155-5100 Parts List
  • GP7155-5100 Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP7155-5100 Installation Instructions
  • GP7155-5100 Repair Instructions
  • Troubleshooting Guide

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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