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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; solid ceramic plungers; nitrile seals with fabric reinforcing; stainless steel valves and cast aluminum bronze 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
Flow35.4 GPM134 L/min
Maximum Discharge Pressure1300 PSI90 bar
Crankshaft Speed800 RPM
Power31.9 HP23.8 KW
Max Temperature140 °F60 °C
Inlet Port Size(2) 1-1/2" NPT
Discharge Port Size(2) 1" NPT
Plunger Diameter1.65 in.42 mm
Stroke1.65 in.42 mm
Maximum Inlet Pressure90 PSI6 bar
Crankshaft Diameter35 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US118 fl. oz. 3.5 L
Weight125 lbs.57 kg
Volumetric Efficiency0.96
Mechanical Efficiency0.85
Manifold Material Aluminum Bronze
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 #09477
35A 07740 O-Ring 3
36 13415 V-Sleeve, Weep 3
40 07745 V-Sleeve 6
Valve Assembly Kit – Part #09136
46A 07751 Valve Assembly, Complete 3
48A 12055 O-Ring 3
Oil Seal Kit – Part #09577
31 07133 Radial Shaft Seal 3

Horsepower Specifications

RPM GPM 600 PSI 800 PSI 1000 PSI 1300 PSI 2000 PSI*
500 22.3 9.6 12.7 15.9 20.7 31.9
555 24.7 10.6 14.1 17.6 22.9 35.3
640 28.5 12.2 16.3 20.4 26.5 40.7
695 30.9 13.2 17.7 22.1 28.7 44.1
750 33.4 14.3 19.1 23.9 31.0 47.7
800 35.6 15.3 20.3 25.4 33.1 50.9
885* 39.4 16.9 22.5 28.1 36.6 56.3

*Intermittent duty only! – Consult factory!

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • LP122B Exploded View
  • LP122B Parts List
  • LP122B Torque Specifications


Documents open in new window/tab.

  • Pump Assembly Instructions
  • Giant Industries Limited Warranty
  • LP122B Installation Instructions
  • LP122B 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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