A German-made triplex plunger positive displacement pump with reciprocating plungers for belt drive 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; nitrile seals (with fabric reinforcing); stainless steel valves and 316 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 www.P65Warnings.ca.gov

  • LP122A-5100 Exploded View
  • LP122A-5100 Parts List
  • Giant Industries Limited Warranty
  • LP122A-5100 Installation Instructions
  • LP122A-5100 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Max Flow (Continuous) 35.4 GPM 134.7 l/min
Max Discharge Pressure (Continuous) 1300 PSI 90 bar
Max Speed (Continuous) 800 RPM
Inlet Pressure 90 PSI 6.2 bar
Plunger Diameter 1.65″ 42 mm
Stroke 1.65″ 42 mm
Max Temp 140 °F 60 °C
Crankshaft Diameter 35 mm
Crankcase Capacity 116 fl. oz. 3.43 L
Weight 126 lbs. 57 kg
Inlet Ports (2) 1-1/2″ NPT
Discharge Ports (2) 1″NPT
Shaft Rotation Top of Pulley Towards Manifold
Shaft Mounting Either Side
Key Component Material
Manifold 316 Stainless Steel Manifold
Plungers Solid Ceramic Plungers
Valves Grade Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End Spheroidal Cast Iron

Click the image to enlarge


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


*Intermittent duty only

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 #09477
35A 07740 O-Ring 3
36 13415 V-sleeve, Weep 3
40 07745 V-Sleeve 6
Valve Assembly Kit – Part #09136-0100
46A 07751-0100 Valve Assembly 6
48A 12055 O-Ring 6
Oil Seal Kit – Part #09577
31 07133 Radial Shaft Seal 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.