A German-made reciprocating triplex plunger pump.

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 machined brass manifold.

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

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

  • P461 Exploded View
  • P461 Parts List
  • P461 Technical Drawing

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  • Giant Industries Limited Warranty
  • P461 Installation Instructions
  • P461 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 3.9 GPM 14.6 L/min
Pressure 7250 PSI 500 bar
Speed 1750 RPM
Maximum Inlet Pressure 145 PSI 10 bar
Plunger Diameter 0.55″ 14 mm
Stroke 0.79″ 20 mm
Max. Temperature of Pumped Fluids 104 ºF 40 ºC
Inlet Ports (2) 1/2″ BSP
Discharge Ports (2) 3/4″ BSP
Shaft Rotation Top of Pulley Towards Manifold
Crankshaft Diameter 28 mm
Key Width 8 mm
Shaft Mounting Either Side
Weight 42 lbs. 19 kg
Crankcase Oil Capacity 27 fl. oz. 0.8 L
Key Component Material
Manifold Special Brass
Plungers Solid Ceramic Oxide
Valves High Grade Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End Aluminum

Click the image to enlarge


RPM GPM 2500 PSI 3500 PSI 5000 PSI 7250 PSI
900 2.0 3.5 4.8 6.9 10.0
1200 2.7 4.7 6.5 9.3 13.5
1450 3.2 5.5 7.7 11.0 16.0
1750 3.9 6.7 9.4 13.5 19.5

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 #09779
21 07266 O-Ring 3
23 06483 Grooved Seal Packing 6
23A 13036 Support Ring 3
24 06484 Guide Ring 3
25A 06492 Support Ring 6
25B 06487 O-Ring 6
Valve Assembly Kit – Part #09781
27A 05543 Valve Assembly, Complete 6
33 05545 O-Ring 3
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.