GP7255A

A German-made reciprocating triplex plunger pump.

Features:
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 nickel-plated Spheroidal cast iron manifold.

  • GP7255A Exploded View
  • GP7255A Parts List
  • Giant Industries Limited Warranty
  • GP7255A Installation Instructions
  • GP7255A Repair Instructions
  • Troubleshooting Guide

SPECIFICATIONS

U.S. Metric
Max Flow (Continuous) 65.8 GPM 250 L/min
Max Flow (Intermittent) 80 GPM 303 L/min
Max Discharge Pressure (Continuous) 1500 PSI 100 bar
Max Discharge Pressure (Intermittent)  2000 PSI 140 bar
Max Speed (Continuous) 700 RPM
Max Speed (Intermittent) 851 RPM
Inlet Pressure 145 PSI 10 bar
Plunger Diameter 2.17″ 55 mm
Stroke 2.05″ 52 mm
Max Temp @ 1000 RPM 140 °F 60 °C
Crankshaft Diameter 48 mm
Key Width 0.6″ 14 mm
Crankcase Capacity 1.6 gal 6.0 L
Weight 374 lbs. 170 kg
Inlet Ports (2) 2-1/2″ NPT
Discharge Ports (2) 1-1/4″ NPT
Shaft Rotation Top of Pulley Towards Manifold
Shaft Mounting Either Side
Key Component Material
Manifold Nickel-Plated Cast Iron
Plungers Solid Ceramic Oxide
Valves Stainless Steel
Seals Nitrile with Fabric Reinforcing
Gear End Spheroidal Cast Iron

Click the image to enlarge


HORSEPOWER SPECIFICATIONS

RPM GPM 800 PSI 1000 PSI 1300 PSI 1500 PSI 2000 PSI*
479 45.0 24.8 31.0 40.3 46.6 62.1*
531 49.9 27.5 34.4 44.7 51.6 68.8*
585 55.0 30.3 37.9 49.3 56.9 75.9*
638 60.0 33.1 41.4 53.8 62.1 82.8*
700 65.8 36.3 45.4 59.0 68.1 90.8*
851* 80.0* 44.1* 55.2* 71.7* 82.8* 110.3*

*Intermittent Duty Only

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

as HP = (GPM X PSI)/1100

*Engine power varies based on horizontal or vertical orientation, as well as by makes and models from each manufacturer.


REPAIR KITS

ITEM# PART# DESCRIPTION Qty.
Plunger Packing Kit – Part #09220
38A 13156 O-Ring 3
38B 07221 O-Ring 3
39A 07223 Grooved Ring 3
42 07711 V-Sleeve 6
Oil Seal Kit – Part #09221
32 07624 Radial Shaft Seal 3
33A 07627 O-Ring 3
Inlet Valve Assembly Kit – Part #09659
51 05594 Inlet Valve Assembly 1
56A 07658 O-Ring 1
56B 07635 Support Ring 1
Large Discharge Valve Kit – Part #09660
52 05600 Discharge Valve Assembly 1
55 05647 Valve Spacer 1
56A 07658 O-Ring 1
56B 07635 Support Ring 1
Small Discharge Valve Kit – Part #09661
51B 05450 Valve Spring 1
51C 05247 Valve Plate 1
51D 05596 O-Ring 1
52F 05599 O-Ring 1
56A 07658 O-Ring 1
56B 07635 Support Ring 1

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.

PUMP CATEGORIES:
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.