A German-made triplex plunger positive displacement pump with reciprocating plungers for direct or belt drive applications.

Anodized aluminum 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.

Gearbox and bell housings (to connect to gasoline, diesel, electric or hydraulic drive).

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

  • P450-5100 Exploded View
  • P450-5100 Parts List
  • P450-5100 Torque Specifications
  • P450-5100 Technical Drawing
  • Giant Industries Limited Warranty
  • P450-5100 Installation Instructions
  • P450-5100 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
1450 RPM
Flow 5.5 GPM 20.8 L/min
Pressure 5075 PSI 350 bar
Maximum Inlet Pressure 90 PSI 6.2 bar
Plunger Diameter 0.71″ 18 mm
Stroke 0.79″ 20 mm
Max. Temperature of Pumped Fluids 160 °F 70 °C
Inlet Ports (2) 3/4″ BSP
Discharge Ports (2 )1/2″ BSP
Shaft Rotation Top of Pulley Towards Manifold
Crankshaft Diameter 1.10″ 28 mm
Key Width 0.32″ 8 mm
Shaft Mounting Either Side
Weight 36.5 lbs. 16.6 kg
Crankcase Oil Capacity 30 fl. oz. 0.9 L
Key Component Material
Manifold Stainless Steel
Plungers Solid Ceramic Oxide
Valves High Grade Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End Aluminum

Click the image to enlarge


RPM GPM 2000 PSI 3000 PSI 4000 PSI 5000 PSI
800 3.0 4.1 6.2 8.3 10.3
933 3.5 4.8 7.2 9.7 12.1
1066 4.0 5.5 8.3 11.0 13.8
1200 4.5 6.2 9.3 12.4 15.5
1450 5.5 7.6 11.4 15.2 19.0

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 #09141
21 07266 O-Ring 3
23 08477 V-Sleeve 6
24 07929 Pressure Ring 3
Valve Assembly Kit – Part #09646
27A 05578 Valve Assembly, Complete 6
33 07489 O-Ring 6
Oil Seal Kit – Part #09641
19 05444 Oil 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.