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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
Flow29.1 GPM110 L/min
Maximum Discharge Pressure7250 PSI500 bar
Crankshaft Speed580 RPM
Power142 HP106 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 Diameter2.76 in.70 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US3.3 gal. 12.5 L
Weight793 lbs.360 kg
NPSHR27.9 Ft.-head8.5 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 #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 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 1000 PSI 2500 PSI 5000 PSI 7250 PSI
300 15.1 10.4 26.0 51.9 75.3
400 20.1 13.8 34.6 69.2 100.3
500 25.1 17.3 43.3 86.5 125.4
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
  • GP8035A Exploded View
  • GP8035 Parts List
  • GP8035A Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • GP8035A Installation Instructions
  • GP8035A 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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