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A German-made reciprocating triplex plunger pump.

Features:
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; solid ceramic plungers; nitrile seals with fabric reinforcing; stainless steel valves and nickel-plated spheroidal cast iron 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

Specification US Metric
Flow20.6 GPM78 L/min
Maximum Discharge Pressure4060 PSI280 bar
Crankshaft Speed1000 RPM
Power57.7 HP43 KW
Max Temperature140 °F60 °C
Inlet Port Size(2) 1-1/2" NPT
Discharge Port Size(2) 1" NPT
Plunger Diameter1.1 in.28 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 Capacity1.21 gal 4.6 L
Weight179 lbs.81 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.
ITEM# PART# DESCRIPTION Qty.
Plunger Packing Kit – Part #09761
35B 08183 O-Ring 3
36 13228 Grooved Ring 3
37A 07700 O-Ring 6
40 13115 V-Sleeve 6
Valve Assembly Kit – Part #09762
44 07150 O-Ring 6
46 07060 Valve Assembly 6
48B 13012 O-Ring 3
Oil Seal Kit – Part #09230
31 13284 Oil Seal 3

Horsepower Specifications

RPM GPM 1000 PSI 2000 PSI 3000 PSI 4060 PSI
600 12.4 8.6 17.1 25.7 34.7
700 14.4 9.9 19.9 29.8 40.3
800 16.5 11.4 22.8 34.1 46.2
900 18.5 12.8 25.5 38.3 51.8
1000 20.6 14.2 28.4 42.6 57.7

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP5128 Exploded View
  • GP5128 Parts List
  • GP5128 Torque Specifications

Literature

Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP5128 Installation Instructions
  • GP5128 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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