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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; Teflon seals and EPDM o-rings; 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
Flow32.5 GPM123.1 L/min
Maximum Discharge Pressure1740 PSI120 bar
Crankshaft Speed1000 RPM
Power39.0 HP29.1 KW
Max Temperature140 °F60 °C
Inlet Port Size(3) 1-1/2" BSP
Discharge Port Size(3) 1" BSP
Plunger Diameter1.42 in.36 mm
Stroke1.65 in.42 mm
Maximum Inlet Pressure90 PSI6.2 bar
Crankshaft Diameter1.38 in.35 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US118 fl. oz. 3.5 L
Weight119 lbs.54 kg
Manifold Material Aluminum Bronze
Crankcase Material Spheroidal Cast Iron
Plunger Material Solid Ceramic Oxide
Valve Material Duplex Steel
Seal Material Teflon Seals, EPDM O-Rings
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 #09720-0023
36 13291-0020 Leakage Seal 3
38 07140-0003 O-Ring 6
40 07144-0020 V-Sleeve 6
Valve Assembly Kit – Part #09196-0123
44A 07150-0003 O-Ring 9
44B 06266 Support Ring 3
46A 07064-0100 Valve Seat 6
46B 07063-0100 Valve Plate 6
46C 07062-0100 Valve Spring 6
Oil Seal Kit – Part #09577
31 07133 Oil Seal 3

Horsepower Specifications

RPM GPM 500 PSI 1000 PSI 1500 PSI 1740 PSI
500 16.3 5.6 11.2 16.9 19.6
640 20.8 7.2 14.4 21.5 25.0
750 24.4 8.4 16.8 25.2 29.3
805 26.2 9.0 18.1 27.1 31.4
865 28.1 9.7 19.4 29.1 33.7
920 29.9 10.3 20.6 30.9 35.9
1000 32.5 11.2 22.4 33.6 39.0

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • LP121A-5123 Exploded View
  • LP121A-5123 Parts List


Documents open in new window/tab.

  • Pump Assembly Instructions
  • Giant Industries Limited Warranty
  • LP121A-5123 Installation Instructions
  • LP121A-5123 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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