• GP7645GBHS-2.73 Exploded View
  • GP7645GBHS-2.73 Parts List

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  • Giant Industries Limited Warranty
  • GP7645GBHS-2.73 Installation Instructions
  • GP7645GBHS-2.73 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 55.5 GPM 210 L/min
Maximum Discharge Pressure 3000 PSI 207 bar
Crankshaft Speed 800 RPM
Power Consumption 111 BHP 82.5 kW
Maximum Inlet Pressure 90 PSI 10 bar
Maximum Temperature 86 ºF 30 ºC
Plunger Diameter 1.77″ 45 mm
Stroke 2.28″ 58 mm
Crankshaft Bore SAE-C Spline 14T 12/24 DP
Crankshaft Rotation Hydraulic Gear towards back of pump
Key Width 14 mm
Crankshaft Mounting Either Side
Inlet Ports (2) 2-1/4″ NPT
Discharge Ports (2) 1-1/4″ NPT
Crankcase Oil Capacity 2.1 gal. 8 L
Weight 476 lbs. 216 kg
Key Component Material
Manifold Nickel-Plated Spheroidal Cast Iron
Plungers Solid Ceramic Oxide
Valves Duplex Steel/Plastic Retainer
Seals Nitrile with Fabric Reinforcing
Crankcase Nickel-Plated Spheroidal Cast Iron

Click the image to enlarge


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.


Plunger Packing Kit – Part #09603
38A 13156 O-Ring 3
38B 07721 O-Ring 3
39A 07723 Grooved Ring 3
42 07711 V-Sleeve 9
Inlet Valve 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
Oil Seal Kit – Part #09221
32 07624 Radial Shaft Seal 3
33A 07627 O-Ring 3

*The discharge valve seat (item 52E) can be flipped over and used. If it is damaged on both sides, order kit #09660.

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.