A German-made reciprocating triplex plunger pump.

Attached gearbox; spheroidal cast iron crankcase with vented dipstick; forged, through-hardened, ground and polished crankshaft and pinion shaft; bronze connecting rods; hardened stainless steel plunger bases; solid ceramic plungers; nitrile seals with fabric reinforcing; stainless steel valves and machined stainless steel manifold. Comes equipped with an integrated oil cooling system.

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

  • GP8140 Exploded View
  • GP8140 Parts List
  • GP8140 Torque Specifications
  • Giant Industries Limited Warranty
  • GP8140 Installation Instructions
  • GP8140 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 39.6 GPM 150 L/min
Maximum Discharge Pressure 5510 PSI 380 bar
Crankshaft Speed 580 PSI
Power Consumption 146 BHP 109 kW
Maximum Inlet Pressure 29 PSI 2 bar
Maximum Temperature 86 °F 30 °C
Plunger Diameter 1.57″ 40 mm
Stroke 2.83″ 72 mm
Pinion Shaft Diameter 1.77″ 45 mm
Pinion Shaft Rotation Towards Gear End of Pump
Key Width 14 mm x 70 mm
Pinion Shaft Mounting Either Side
Inlet Ports (2) 2″ NPT
Discharge Ports (2) 1″ NPT
Crankcase Oil Capacity 4.2 gal 16.0 L
Weight 800 lbs. 363 kg
NPSHR 24.6 ft.-head 7.5 mWs
Key Material Component  
Manifold Stainless Steel Manifold
Plunger Solid Ceramic Plungers
Valves Stainless Steel Valve
Seals Nitrile Seals with Fabric Reinforcing
Gear End Cast Iron Crankcase

Click the image to enlarge


RPM GPM 1000 PSI 2500 PSI 3500 PSI 5510 PSI
300 20.5 14.1 35.3 49.5 77.9
400 27.3 18.8 47.1 65.9 103.7
500 34.1 23.5 58.8 82.3 129.6
580 39.6 27.3 68.3 95.6 150.5

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 #09708
38A 05818 O-Ring 6
39A 05617 O-Ring 3
40 05820 Sleeve 3
40A 05821 O-Ring 3
41A 05824 Guide Ring 3
42 05825 Rope Packing 3
44 05827 Support Ring 3
Inlet Valve Assembly Kit – Part #09709
51 05837 Inlet Valve Assembly 3
56A 05408 O-Ring 3
Discharge Valve Kit – Part #09710
52 05839 Discharge Valve Assembly 3
56A 05408 O-Ring 3
Oil Seal Kit – Part #09584
32 05058 Radial Shaft Seal 3
33A 05056 O-Ring 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.