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

  • CP425-5123 Exploded View
  • CP425-5123 Parts List
  • CP425-5123 Torque Specifications

Sorry, there are no accessories associated with this product.

  • Giant Industries Limited Warranty
  • CP425-5123 Installation Instructions
  • CP425-5123 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 5.5 GPM 21.0 L/min
Maximum Discharge Pressure 2030 PSI 140 bar
Power Consumption 750 RPM
Maximum Inlet Pressure 870 PSI 60 bar
Max. Temperature of Pumped Fluids -40 to 160 ºF -40 to 70 ºC
Plunger Diameter 1.02″ 25 mm
Stroke 0.79″ 20 mm
Crankshaft Diameter 1.10″ 28 mm
Crankshaft Rotation Top of Pulley Towards Manifold
Key Width 0.31″ 8 mm
Crankshaft Mounting Either Side
Inlet Ports (2) 1″ BSP
Discharge Ports (2) 3/4″ BSP
Crankcase Oil Capacity 30.4 fl. oz. 0.9 L
Weight 38.3 lbs. 17.4 kg
Key Component Material
Manifold Stainless Steel
Plungers Solid Ceramic Oxide
Valves High Grade Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End

Click the image to enlarge


RPM GPM 500 PSI 1000 PSI 1500 PSI 2030 PSI
350 2.59 0.9 1.8 2.7 3.6
450 3.33 1.1 2.3 3.4 4.7
550 4.07 1.4 2.8 4.2 5.7
650 4.81 1.7 3.3 5.0 6.7
750 5.55 1.9 3.8 5.7 7.8

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 #CP09595
21 CP07266-0003 O-Ring 3
23 CP06144 V-Sleeve 3
23B CP12255-0020 Weep Seal 3
24 CP08376 Pressure Ring 6
Valve Assembly Kit – Part #CP09596-0103
27A CP04643-0103 Valve Assembly, Complete 6
33 CP07218-0003 O-Ring 6
Oil Seal Kit – Part #CP09641
19 CP05444 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.