A German-made reciprocating triplex plunger pump.

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 machined 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

  • GP7142-4000HTC Exploded View
  • GP7142-4000HTC Parts List
  • Giant Industries Limited Warranty
  • GP7142-4000HTC Installation Instructions
  • GP7142-4000HTC Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 25.1 GPM 95 L/min
Maximum Discharge Pressure 1160 PSI 80 bar
Crankshaft Speed 460 RPM
Maximum Inlet Pressure 140 PSI 10 bar
Maximum Temperature 221 ºF 105 ºC
Plunger Diameter 1.7″ 42 mm
Stroke 2.0″ 52 mm
Crankshaft Diameter 1.9″ 48 mm
Crankshaft Rotation Top of pulley towards manifold
Key Width 0.6″ 14 mm
Crankshaft Mounting Either side
Inlet Ports (2) 2-1/2″ BSP
Discharge Ports (2) 1-1/4″ BSP
Crankshaft Oil Capacity 1.8 Gal. 7.0 L
Weight 375 lbs. 170 kg.
Key Component Material
Manifold Machined Stainless Steel
Plungers Solid Ceramic Oxide
Valves Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End Spheroidal Cast Iron

Click the image to enlarge


RPM GPM 250 PSI 500 PSI 750 PSI 1160 PSI
230 12.6 2.2 4.4 6.5 10.1
300 16.4 2.8 5.7 8.5 13.1
400 21.8 3.8 7.5 11.3 17.4
460 25.1 4.3 8.7 13.0 20.1

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 #09804
38A 13156 O-Ring 3
38B 04779 O-Ring 3
39B 04780 Seal Pack 3
42 04776 V-Sleeve 9
43 04777 Pressure Ring 3
Oil Seal Kit – Part #09221
32 07624 Radial Shaft Seal 3
33A 07627 O-Ring 3
Valve Repair Kit – Part #09806
51B 07732-0100 Valve Spring 6
51C 05314 Valve Plate 6
51D 05136A Valve Seat 6
51E 07653-0003 O-Ring 6
51F 13166 Support Ring 6
56A 07658-0003 O-Ring 6
56B 07635 Support Ring 6
56C 13166 Support Ring 3
56D 07653-0003 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.