PULLEY INFORMATION
Pulley selection and pump speed are based on
a 1725 RPM motor and “B” section belts. When
selecting desired GPM, allow for a ±5% tolerance
on pumps output due to variations in pulleys, belts
and motors among manufacturers.
1. Select GPM required, then select appropriate
motor and pump pulley from the same line.
2. The desired pressure is achieved by selecting
the correct nozzle size that corresponds with the
pump GPM.
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*
GP7255A PULLEY SELECTION &
HORSEPOWER REQUIREMENTS
U.S. ........................... (Metric)
Volume (Continuous) ......................................................65.8 GPM ................. (250 LPM)
Volume (Intermittent) ......................................................80 GPM* ................... (303 LPM)*
Discharge Pressure (Continuous) .................................1500 PSI ................... (100 bar)
Discharge Pressure (Intermittent)...................................2000 PSI* .................. (140 bar)*
Speed (Continuous)........................................................................................... 700 RPM
Speed (Intermittent) ........................................................................................... 851 RPM*
Inlet Pressure (maximum) ..............................................145 PSI .................... (10 bar)
Plunger Diameter
............................................................2.17” .......................... 55mm
Plunger Stroke
................................................................2.0” ............................ 52mm
Crankshaft Diameter.......................................................1.9” ............................ 48mm
Key Width
.......................................................................0.6” ............................ 14mm
Crankshaft Mounting .........................................................................................
Either side
Shaft Rotation
.................................................................
Top of pulley towards manifold
Temperature of Pumped Fluids
......................................Up to 140
o
F
............. (60
o
C)
Inlet Ports
.......................................................................................................... (2) 2-1/2” NPT
Discharge Ports
................................................................................................. (2) 1-1/4” NPT
Weight
............................................................................374 lbs. ..................... (170 kg)
Crankcase Oil Capacity ..................................................1.6 Gal. ..................... (6.0 liter)
Fluid End Material
...........................................................Nickel-Plated Spheroidial Cast Iron
Specifications
Model GP7255A(-SSP)
Consult the factory for special requirements that must be met if the pump is to
operate beyond one or more of the limits specified above.
HORSEPOWER INFORMATION
Horsepower ratings shown are the power re-
quirements for the pump. Gas engine power
outputs must be approximately twice the pump
power requirements shown above.
We recommend that a 1.15 service factor be speci
-
fied when selecting an electric motor as the power
source. To compute specific pump horsepower
requirements, use the following formula:
(GPM X PSI) / 1450 = HP
* Intermittent Duty Only!
5
GP7255A-SSP Horsepower Requirements
