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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 and pinion shaft; bronze connecting rods; hardened stainless steel plunger bases; solid ceramic plungers; nitrile seals with fabric reinforcing; stainless steel valves and machined stainless steel 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
Flow29.1 GPM110 L/min
Maximum Discharge Pressure7250 PSI500 bar
Crankshaft Speed580 RPM
Power145.5 HP108.5 KW
Max Temperature86 °F30 °C
Inlet Port Size(2) 2" NPT
Discharge Port Size(2) 1" NPT
Plunger Diameter1.38 in.35 mm
Stroke2.83 in.72 mm
Maximum Inlet Pressure29 PSI2 bar
Crankshaft Diameter45 mm
Crankshaft RotationTop of Pulley Towards Manifold
Key Width14mm x 70mm mm
Crankshaft MountingEither Side
Crankcase Oil Capacity4.2 gal 16.0 L
Weight800 lbs.363 kg
NPSHR8.5 mWs
Manifold Material Stainless Steel
Crankcase Material 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 #09707
38A 05408 O-Ring 6
39A 05617 O-Ring 3
40 05744 Sleeve 3
40A 05745 O-Ring 3
41A 05747 Guide Ring 3
42 05748 Rope Packing 6
44 05751 Support Ring 6
Inlet Valve Assembly Kit – Part #09709
51 05837 Inlet Valve Assembly 3
56A 05408 O-Ring 3
Discharge Valve Kit – Part #09710
52 05839 Discharge Valve Assembly 3
56A 05408 O-Ring 3
Oil Seal Kit – Part #09584
32 05058 Radial Shaft Seal 3
33A 05056 O-Ring 3

Horsepower Specifications

RPM gpm 1000 PSI 2500 PSI 5000 PSI 7250 PSI
300 15.1 10.4 26.0 52.1 75.5
400 20.1 13.9 34.7 69.3 100.5
500 25.1 17.3 43.3 86.6 125.5
580 29.1 20.1 50.2 100.3 145.5

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • GP8135 Exploded View
  • GP8135 Parts List
  • GP8135 Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP8135 Installation Instruction
  • GP8135 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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