A German-made reciprocating triplex plunger pump for high temperature applications.

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; high temperature nitrile seals (with fabric reinforcing); stainless steel valves and cast bronze manifold with coolant tube connections.

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

  • LP121HT Exploded View
  • LP121HT Parts List
  • LP121HT Torque Specifications
  • Giant Industries Limited Warranty
  • LP121HT Installation Instructions
  • LP121HT Repair Instructions
  • Troubleshooting Guide


U.S. Metric
570 RPM
Max Flow (Continuous) 17.6 GPM 66.6 L/min
Max Discharge Pressure (Continuous) 1200 PSI 82.7 bar
Inlet Pressure 90 PSI 6.2 bar
Plunger Diameter 1.42″ 36 mm
Stroke 1.57″ 40 mm
Max Temp 220 °F 105 °C
Crankshaft Diameter  1.38″  35mm
Crankcase Capacity  116 fl. oz.  3.4 L
Weight 110 lbs. 49 kg
Inlet Ports (3) 1-1/2″ BSP
Discharge Ports (3) 1″ BSP
Shaft Rotation Top of Pulley Towards Manifold
Shaft Mounting Either Side
Key Component Material
Manifold Cast Bronze
Plungers Solid Ceramic Oxide
Valves High Grade Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End

Click the image to enlarge


RPM GPM 300 PSI 600 PSI 900 PSI 1200 PSI
200 6.2 1.3 2.6 3.8 5.1
300 9.3 1.9 3.8 5.8 7.7
400 12.4 2.6 5.1 7.7 10.2
500 15.5 3.2 6.4 9.6 12.8
600 17.6 3.7 7.3 11.0 14.6

Horsepower Requirements

The ratings shown are the power requirements for the pump. Gas engine power outputs must be approximately twice the pump power requirements shown above.

We recommend a 1.15 service factor be specified when selecting an electric motor as the power source. To compute specific pump horsepower requirements use the following formulas:
Electric HP = (GPM X PSI)/1450
Gas HP = (GPM X PSI)/1100

*Engine power varies based on horizontal or vertical orientation, as well as by makes and models from each manufacturer.


Plunger Packing Kit – Part #09310
36 13291 Leakage Seal 3
38 07140 O-Ring 6
40 13199 V-Sleeve 6
Valve Assembly Kit – Part #09196
44A 07150 O-Ring 9
44B 06266 Support Ring 3
46A 07064 Valve Seat 3
46B 07063 Valve Plate 3
46C 7062 Valve Spring 3

Repair Kits Available

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.

Service & Repair

Giant provides service on each pump and accessory that we sell. Many basic repair procedures are covered in the Giant repair manual. For all other questions on service or repair needs please contact your local Giant distributor.